ADVANCED NMR SYSTEMS INC
8-K, 1995-09-08
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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          ================================================================



                          SECURITIES AND EXCHANGE COMMISSION

                                Washington, D.C. 20549


                                       FORM 8-K


                                    Current Report
                          Pursuant to Section 13 or 15(d) of
                         The Securities Exchange Act of 1934



           Date of Report (Date of earliest event reported) August 31, 1995
                                                           ----------------




                              ADVANCED NMR SYSTEMS, INC.
                (Exact name of registrant as specified in its charter)


               Delaware                0-11914              22-2457487
           ----------------         ------------         ----------------
            (State or other          (Commission         (I.R.S. Employer
             jurisdiction           File Number)        Identification No.)
           of Incorporation)


                        47 Jonspin Road, Wilmington, MA  01887
               -------------------------------------------------------
                 (Address of principal executive offices)  (Zip Code)


          Registrant's telephone number, including area code (508) 657-8876
                                                             ---------------



          ================================================================

          <PAGE>


          ITEM 2.   ACQUISITION OR DISPOSITION OF ASSETS.
                    ------------------------------------

                    On August 31, 1995, Medical Diagnostics, Inc., a
          Delaware corporation ("Old MDI"), merged (the "Merger"), with and
          into Advanced NMR Acquisition Corp., a Delaware corporation
          ("Acquisition Corp." prior to the Merger and "MDI" after the
          Merger) and wholly-owned subsidiary of the registrant Advanced
          NMR Systems, Inc., a Delaware corporation ("Advanced NMR"),
          pursuant to the terms and conditions of the Agreement and Plan of
          Merger, dated as of May 2, 1995 (the "Merger Agreement"), among
          Advanced NMR, Acquisition Corp. and Old MDI.  Upon the Merger,
          Acquisition Corp. as the surviving corporation changed its name
          to "Medical Diagnostics, Inc."

                    In connection with the Merger, MDI entered into a Loan
          and Security Agreement with Chemical Bank, dated as of August 31,
          1995 (the "Loan Agreement"), in part to fund the cash
          consideration portion of the Merger and to pay for Merger
          expenses.  MDI's obligations under the Loan Agreement are
          guaranteed by (i) Advanced NMR pursuant to a Guaranty and
          Security Agreement, dated as of August 31, 1995, with Chemical
          Bank and (ii) certain MDI subsidiaries pursuant to a Guaranty and
          Security Agreement, dated as of August 31, 1995, with Chemical
          Bank (collectively, the "Guaranty Agreements").

                    Pursuant to the Merger Agreement, each share of common
          stock, $.01 par value per share, of Old MDI (the "Old MDI Common
          Stock") was exchangeable for (i) $8.00 in cash (the "Cash
          Consideration"), or (ii) 2.861 shares of Advanced NMR Common Stock
          plus one Advanced NMR Warrant (collectively, the "Share
          Consideration"), or (iii) a combination of the Cash Consideration
          and the Share Consideration (collectively, the Merger
          Consideration"), provided that not more than 37.5% of the Old MDI
          Common Stock could be exchanged for the Cash Consideration.

                    Based upon elections made by the Old MDI Stockholders,
          the Cash Consideration was pro rated so each such holder who
          elected the Cash Consideration is to receive $4.02 in cash, 1.423
          shares of Advanced NMR Common Stock and .4975 of an Advanced NMR
          Warrant for each Old MDI share exchanged.  The Merger
          Consideration comprised an aggregate of approximately
          $11,196,102, 6,670,157 shares of Advanced NMR Common Stock and
          2,331,722 warrants to purchase Advanced NMR Common Stock
          (subject to rounding down for fractional shares and fractional
          warrants).

                    Advanced NMR also assumed all rights and obligations of
          Old MDI under options and warrants outstanding at the effective
          date of the Merger for the purchase of shares of Old MDI Common
          Stock.  At the Advanced NMR Annual Meeting of Stockholders held
          on August 31, 1995, the stockholders approved an amendment to the
          Advanced NMR 1993 Employee Stock Option Plan increasing the
          number of shares of Advanced NMR Common Stock available
          thereunder for options to 2,250,000 shares.

                    Each Advanced NMR Warrant is exercisable for the
          purchase of one share of Advanced NMR Common Stock at $3.75 per
          share, subject to adjustment, for a period of five years subject
          to redemption at $.05 per Warrant in the event the average market
          price of Advanced NMR Common Stock for a period of any 20
          consecutive trading days is at least $4.50 per share.  The
          Warrants are traded on the Nasdaq National Market System,
          initially on a "when issued" basis under the symbol ANMWV.

                    The financing provided for under the Loan Agreement
          consists of a $9 million five year term loan facility and a $6
          million revolving credit facility.  The Chemical loan facilities
          are being used to fund the Cash Consideration in the Merger, to
          pay certain expenses of the Merger, to repay MDI's current bank
          facility and for working capital.  The Chemical loan facilities,
          including the respective Guaranty Agreements, are secured by a
          first lien on specified assets of MDI, Advanced NMR and certain
          designated subsidiaries of MDI and a pledge of Advanced NMR's
          unescrowed shares in Advanced Mammography Systems, Inc. and the
          shares or interests of MDI in designated MDI subsidiaries.  The
          Loan Agreement contains customary affirmative and negative
          covenants, including specific financial ratios and requirements
          and restrictions on incurring additional debt and paying cash
          dividends, restrictions on upstreaming monies to Advanced NMR and
          customary default provisions.

                    Upon the Merger the Advanced NMR Board of Directors was
          increased to ten from seven and John A. Lynch, Edward J. Connors
          and Milton L. Glass, former directors of Old MDI, were added to
          fill the vacancies, and Mr. Lynch became Senior Vice President of
          Advanced NMR and President and CEO of MDI, and his new Employment
          Agreement became effective.

                    The basic terms of the Merger were described in the
          Joint Proxy Statement/Prospectus of Advanced NMR and MDI, dated
          August 4, 1995, which was included in Advanced NMR's Registration
          Statement on Form S-4 (No. 33-95320) (the "Registration
          Statement").  Further information with respect to the Merger, the
          Merger Agreement, the Loan Agreement and the Guaranty Agreements
          is contained in the Registration Statement, which is incorporated
          herein by reference.

                    The summary contained herein of certain terms of the
          Merger, the Merger Agreement, the Loan Agreement and the Guaranty
          Agreements is qualified in its entirety by reference to such
          agreements, all of which are either filed herewith or
          incorporated herein by reference.


          ITEM 7.   FINANCIAL STATEMENTS, PRO FORMA FINANCIAL
                    INFORMATION AND EXHIBITS.
                    -----------------------------------------

          (a)  Financial Statements of Businesses Acquired.

                    (1)  The audited consolidated balance sheets of MDI and
          subsidiaries as at September 30, 1994 and 1993 and the related
          consolidated statements of income, stockholders' equity and cash
          flows for each of the three years in the period ended September
          30, 1994 are incorporated by reference herein to the financial
          statements of MDI included in the Registration Statement.

                    (2)  The unaudited consolidated balance sheets of MDI
          and subsidiaries as at March 31, 1995 and September 30, 1994 and
          the related unaudited consolidated statements of operations,
          stockholder's equity and cash flows for the six months ended
          March 31, 1995 and 1994 are incorporated by reference herein to
          the financial statements of MDI included in the Registration 
          Statement.

          (b)  Pro Forma Financial Information.

                    The unaudited pro forma combined condensed balance
          sheets at March 31, 1995 and the related unaudited pro forma
          combined condensed statements of operations for the three months
          ended March 31, 1995 and the twelve months ended December 31,
          1994 are incorporated by reference herein to the pro forma
          financial statements included in the Registration Statement.

          (c)  Exhibits

                    3.1       Certificate of Amendment to Certificate of
                              Incorporation of Advanced NMR, filed August
                              31, 1995.

                    3.2       Certificate of Merger of Old MDI into
                              Acquisition Corp., filed August 31, 1995.

                    4.        Warrant Agreement, dated as of August 31,
                              1995, between Advanced NMR and American Stock
                              Transfer and Trust Company.

                    10.1      Agreement and Plan of Merger, dated May 2,
                              1995, among Advanced NMR, Old MDI and
                              Acquisition Corp. [incorporated by reference
                              to Exhibit 2 to the Advanced NMR Registration
                              Statement on Form S-4 (File No. 33-95320),
                              declared effective August 3, 1995].

                    10.2      Loan and Security Agreement, dated as of
                              August 31, 1995, between MDI and Chemical
                              Bank (without exhibits).

                    10.3      Guaranty and Security Agreement, dated as of
                              August 31, 1995, between Advanced NMR and
                              Chemical Bank (without exhibits).

                    10.4      Guaranty and Security Agreement, dated as of
                              August 31, 1995, between certain subsidiaries
                              of MDI and Chemical Bank (without exhibits).

                    10.5      Pledge Agreement, dated as of August 31,
                              1995, between Advanced NMR and Chemical Bank.

                    10.6      Pledge Agreement, dated as of August 31,
                              1995, between MDI and Chemical Bank.


          ITEM 8.   CHANGE IN FISCAL YEAR.
                    ---------------------

                    On August 31, 1995, the Board of Directors of Advanced
          NMR decided to change the fiscal year of Advanced NMR from the
          year ending December 31 to the year ending September 30,
          effective as of September 30, 1995.  The report covering the
          transitional period will be the Form 10-K for the year ending
          September 30, 1995.  The Board made its determination because the
          fiscal year of Old MDI is a year ending on September 30 and it
          was necessary to conform the fiscal periods of Advanced NMR and
          MDI upon the Merger.

          <PAGE>

                                      SIGNATURE


                    Pursuant to the requirements of the Securities Exchange
          Act of 1934, the Registrant has duly caused this report to be
          signed on its behalf by the undersigned thereunto duly
          authorized.


                                        ADVANCED NMR SYSTEMS, INC.


                                        /s/ Jack Nelson
                                        ___________________________________
                                        Name:   Jack Nelson
                                        Title:  Chairman

          Dated:  September 8, 1995

          <PAGE>


                                EXHIBIT INDEX


          Exhibit
          Number              Description of Exhibit
          -------             ----------------------

          3.1            Certificate of Amendment to Certificate of
                         Incorporation of Advanced NMR, filed August 31,
                         1995.

          3.2            Certificate of Merger of MDI into Acquisition
                         Corp., filed August 31, 1995.

          4.             Warrant Agreement, dated as of August 31, 1995,
                         between Advanced NMR and American Stock Transfer
                         and Trust Company.

          10.2           Loan and Security Agreement, dated as of August
                         31, 1995, between MDI and Chemical Bank (without
                         exhibits).

          10.3           Guaranty and Security Agreement, dated as of
                         August 31, 1995, between Advanced NMR and Chemical
                         Bank (without exhibits).

          10.4           Guaranty and Security Agreement, dated as of
                         August 31, 1995, between certain MDI Subsidiaries
                         and Chemical Bank (without exhibits).

          10.5           Pledge Agreement, dated as of August 31, 1995,
                         between Advanced NMR and Chemical Bank.

          10.6           Pledge Agreement, dated as of August 31, 1995,
                         between MDI and Chemical Bank.



                                                                EXHIBIT 3.1


                               CERTIFICATE OF AMENDMENT

                                          OF

                             CERTIFICATE OF INCORPORATION

                                          OF

                              ADVANCED NMR SYSTEMS, INC.

                       (Pursuant to Section 242 of the General
                      Corporation Law of the State of Delaware)


                  ADVANCED NMR SYSTEMS, INC., a corporation organized and

        existing under and by virtue of the General Corporation Law of the

        State of Delaware (the "Corporation"), DOES HEREBY CERTIFY:

                  FIRST:    The Board of Directors of the Corporation duly
                  -----

        adopted resolutions setting forth a proposed amendment (the

        "Amendment") to the Certificate of Incorporation of the Corporation,

        declaring the Amendment to be advisable and calling for the submission

        of the Amendment to the stockholders of the Corporation pursuant to

        Section 242(b)(2) of the General Corporation Law of the State of

        Delaware (the "DGCL"), and stating that the Amendment will be

        effective only after approval thereof by the holders of a majority of

        the outstanding shares of stock of the Corporation entitled to vote

        thereon.

                  SECOND:   Thereafter, pursuant to a resolution of the Board
                  ------

        of Directors of the Corporation, the Amendment was submitted to the

        holders of all of the outstanding shares of Common Stock of the

        Corporation at the 1995 Annual Meeting of Stockholders, and a majority

        of such holders, adopted the following resolution to amend the

        Certificate of Incorporation of the Corporation:

                    RESOLVED, that the Certificate of Incorporation be, and
          it hereby is, amended by deleting in its entirety the present
          Article FOURTH and substituting in lieu thereof the following new
          Article FOURTH:

                    FOURTH:  Capital Stock.  The total number of shares of
                    ------   -------------
          stock which the Corporation shall have authority to issue is fifty
          million (50,000,000) shares, of which fifty million (50,000,000)
          shares shall be Common Stock of the par value of one cent ($.01)
          per share (hereinafter called "Common Stock"). 

          THIRD:    The Amendment was duly adopted in accordance with the
          -----

        provisions of Section 242 of the DGCL.



               IN WITNESS WHEREOF, said Advanced NMR Systems, INC. has caused
        this certificate to be signed by Jack Nelson, its President, as of the
        31st day of August, 1995.

                                   ADVANCED NMR SYSTEMS, INC.
                                   
                                   By:   /s/ Jack Nelson
                                        ----------------------------
                                              Jack Nelson,
                                         Chairman of the Board



                                                                EXHIBIT 3.2


                                CERTIFICATE OF MERGER
                                          OF
                              MEDICAL DIAGNOSTICS, INC.
                               (a Delaware corporation)
                                         INTO
                                ANMR ACQUISITION CORP.
                               (a Delaware corporation)


                             (Pursuant to Section 251 of 
                the General Corporation Law of the State of Delaware)


               The undersigned corporation organized and existing under and by
     virtue of the General Corporation Law of the State of Delaware, DOES HEREBY
     CERTIFY:


               1.  The name and state of incorporation of each of the
     constituent corporations (the "Constituent Corporations") to the merger
     (the "Merger") is as follows:

          NAME                          STATE OF INCORPORATION
          ----                          ----------------------

     ANMR Acquisition Corp.                  Delaware
     Medical Diagnostics, Inc.               Delaware


               2.  An Agreement and Plan of Merger, dated May 2, 1995, among the
     Constituent Corporations and other party thereto has been approved,
     adopted, certified, executed and acknowledged by each of the Constituent
     Corporations in accordance with the requirements of Section 251(c) of the
     General Corporation Law of the State of Delaware.


               3.  The name of the surviving corporation of the Merger is ANMR
     Acquisition Corp. (the "Surviving Corporation").  Upon the Merger the name
     of the Surviving Corporation shall be changed to Medical Diagnostics, Inc. 


               4.  The Certificate of Incorporation of the Surviving Corporation
     shall be its Certificate of Incorporation except that Article FIRST thereof
     shall be amended to read in its entirety as follows:

               "FIRST:  Name.  The name of the corporation is Medical
                -----   ----
               Diagnostics, Inc. (hereinafter referred to as the "Corporation")"


               5.  The executed Agreement and Plan of Merger is on file at the
     principal place of business of the Surviving Corporation.  The address of
     the principal place of business of the Surviving Corporation is 46 Jonspin
     Road, Wilmington, Massachusetts 01887.


               6.  A copy of the Agreement and Plan of Merger will be furnished
     by the Surviving Corporation, on request and without cost to any
     stockholder of either Constituent Corporation.


               IN WITNESS WHEREOF, this Certificate of Merger has been executed
     by Jack Nelson, President of ANMR Acquisition Corp. as of this 31st day of
     August, 1995.


                                   ANMR ACQUISITION CORP.


                                   BY:  /s/ Jack Nelson
                                        --------------------------
                                             Jack Nelson
                                             Chairman of the Board



                                                                EXHIBIT 4


                                  WARRANT AGREEMENT
                                  -----------------


               WARRANT AGREEMENT, dated as of August 31, 1995, by and between
     ADVANCED NMR SYSTEMS, INC., a Delaware corporation ("Company"), and
     AMERICAN STOCK TRANSFER & TRUST COMPANY, as Warrant Agent (the "Warrant
     Agent").

                                W I T N E S S E T H :
                                - - - - - - - - - - 

               WHEREAS, the Company, its wholly-owned subsidiary ANMR
     Acquisition Corp., a Delaware corporation ("Acquisition Corp."), and
     Medical Diagnostics, Inc., a Delaware corporation ("MDI"), have entered
     into an Agreement and Plan of Merger, dated as of May 2, 1995 (the "Merger
     Agreement"), providing for the Merger (the "Merger") of MDI with and into
     Acquisition Corp.;

               WHEREAS, as partial consideration on the Merger in exchange for
     outstanding shares of MDI common stock, $.01 par value ("MDI Common
     Stock"), the Company is to issue one Warrant (the "Warrant" or
     collectively, the "Warrants") to purchase one share of the Company's Common
     Stock (as hereinafter defined) for each share of MDI Common Stock which is
     converted in the Merger for Share Consideration (as defined in the Merger
     Agreement) at an exercise price of $3.75 per share; and

               WHEREAS, the Company desires the Warrant Agent to act on behalf
     of the Company, and the Warrant Agent is willing to so act, in connection
     with the issuance, registration, transfer, exchange and redemption of the
     Warrants, the issuance of certificates representing the Warrants, the
     exercise of the Warrants, and the rights of the holders thereof; 

               NOW THEREFORE, in consideration of the premises and the mutual
     agreements hereinafter set forth and for the purpose of defining the terms
     and provisions of the Warrants and the certificates representing the
     Warrants and the respective rights and obligations thereunder of the
     Company, the holders of certificates representing the Warrants and the
     Warrant Agent, the parties hereto agree as follows: 

               SECTION 1.  Definitions.  As used herein, the following terms
                           -----------
     shall have the following meanings, unless the context shall otherwise
     require: 

               1.01  "Common Stock" means common stock, $.01 par value, of the
     Company, whether now or hereafter authorized. 

               1.02  "Corporate Office" means the office of the Warrant Agent
     (or its successor) at which at any particular time its principal business
     shall be administered, which office is located at the date hereof at 40
     Wall Street, New York, New York 10005.

               1.03  "Effective Date" means the date on which a Certificate of
     Merger meeting the requirements of Section 251 of the Delaware General
     Corporation Law shall be executed, verified and acknowledged and delivered
     to the Secretary of State of the State of Delaware for filing in accordance
     with the terms of the Merger Agreement.

               1.04  "Exercise Date" means, as to any Warrant, the date on which
     the Warrant Agent shall have received both (a) the Warrant Certificate
     representing such Warrant, with the exercise form thereon duly executed by
     the Registered Holder thereof or his attorney duly authorized in writing,
     and (b) payment in cash, or by official bank or certified check made
     payable to the Company, of an amount in lawful money of the United States
     of America equal to the applicable Purchase Price. 

               1.05  "Exercise Price" means the purchase price per share to be
     paid upon exercise of each Warrant in accordance with the terms hereof,
     which price shall be $3.75 for each share of Common Stock, subject to
     adjustment from time to time pursuant to the provisions of Section 9
     hereof, and subject to the Company's right to reduce the Exercise Price
     upon notice to all Registered Holders. 

               1.06  "Market Price" means the closing price of the Common Stock
     as reported by the National Association of Securities Dealers, Inc.
     ("Nasdaq"), a national securities exchange or such other market where the
     Common Stock is then listed or traded. 

               1.07  "Redemption Price" means the price at which the Company
     may, at its option, redeem the Warrants, in accordance with the terms
     hereof, which price shall be $.05 per Warrant. 

               1.08  "Registered Holder" means as to any Warrant and as of any
     particular date, the person in whose name the certificate representing the
     Warrant shall be registered on that date on the books maintained by the
     Warrant Agent pursuant to Section 6. 

               1.09  "Trading Day" means each Monday, Tuesday, Wednesday,
     Thursday and Friday, other than any day on which securities are not traded
     on the National Association of Securities Dealers Automated Quotation
     System or on the exchange which is the principal United States market for
     the Common Stock of the Company, as determined by the Board of Directors of
     the Company.

               1.10 "Transfer Agent" means American Stock Transfer & Trust
     Company, as the Company's transfer agent, or its authorized successor, as
     such. 

               1.11  "Warrant Expiration Date" means 5:00 P.M. (New York time)
     on the date five years from the Effective Date of the Merger contemplated
     by the Merger Agreement or the Redemption Date as defined in Section 8,
     whichever is earlier; provided that if such date shall in the State of New
     York be a holiday or a day on which banks are authorized or required to
     close, then 5:00 P.M. (New York time) on the next following day which in
     the State of New York is not a holiday or a day on which banks are
     authorized or required to close.  Upon notice to all Registered Holders the
     Company shall have the right to extend the Warrant Expiration Date. 

               1.12  "Warrant Shares" means the shares of Common Stock or other
     securities pursuant to Section 9 hereof issuable upon exercise of the
     Warrants.

               SECTION 2.  Warrants and Issuance of Warrant
                           --------------------------------
                           Certificates. 
                           ------------

               2.01  A Warrant initially shall entitle the Registered Holder of
     the Warrant Certificate representing such Warrant to purchase one share of
     Common Stock upon the exercise thereof, in accordance with the terms
     hereof, subject to modification and adjustment as provided in Section 9. 

               2.02  Upon the execution of this Agreement, Warrant Certificates
     representing the number of Warrants to be exchanged in partial
     consideration for MDI Common Stock upon the Merger to certain holders of
     such MDI Common Stock or holders of securities exercisable for or
     convertible into MDI Common Stock in accordance with the terms of the
     Merger Agreement shall be executed by the Company and delivered to the
     Warrant Agent. 

               2.03  From time to time, up to the Warrant Expiration Date, the
     Transfer Agent shall countersign and deliver stock certificates in required
     whole number denominations. 

               2.04  From time to time, up to the Warrant Expiration Date, the
     Warrant Agent shall countersign and deliver Warrant Certificates in
     required whole number denominations to the persons entitled thereto in
     connection with any transfer or exchange permitted under this Agreement;
     provided that no Warrant Certificates shall be issued except (i) those
     initially issued hereunder, (ii) those issued on or after the Effective
     Date, upon the exercise of fewer than all Warrants represented by any
     Warrant Certificate, to evidence any unexercised Warrants held by the
     exercising Registered Holder, (iii) those issued upon any transfer or
     exchange pursuant to Section 6; (iv) those issued in replacement of lost,
     stolen, destroyed or mutilated Warrant Certificates pursuant to Section 7;
     and (v) at the option of the Company, in such form as may be approved by
     the Board of Directors, to reflect any adjustment or change in the Exercise
     Price, the number of shares of Common Stock purchasable upon exercise of
     the Warrants or the Redemption Price therefor made pursuant to Section 9
     hereof.  In addition, from time to time after the execution of this
     Agreement and up to the Warrant Expiration Date, upon the written request
     of the Company, the Warrant Agent shall countersign and deliver Warrant
     Certificates as partial consideration upon exercise of MDI stock options or
     warrants or upon conversion of an MDI convertible note assumed by the
     Company upon the Merger.

               SECTION 3.  Form and Execution of Warrant Certificates.
                           ------------------------------------------

               3.01  The Warrant Certificates shall be substantially in the form
     annexed hereto as Exhibit A (the provisions of which are hereby
                       ---------
     incorporated herein) and may have such letters, numbers or other marks of
     identification or designation and such legends, summaries or endorsements
     printed, lithographed or engraved thereon as the Company may deem
     appropriate and as are not inconsistent with the provisions of this
     Agreement, or as may be required to comply with any law or with any rule or
     regulation made pursuant thereto or with any rule or regulation of any
     stock exchange or national securities system on which the Warrants may be
     listed.  The Warrant Certificates shall be dated the date of issuance
     thereof (whether upon initial issuance, transfer, exchange or in lieu of
     mutilated, lost, stolen, or destroyed Warrant Certificates) and issued in
     registered form.  Warrant Certificates shall be numbered serially with the
     letter W. 

               3.02  Warrant Certificates shall be executed on behalf of the
     Company by its Chairman of the Board, Vice Chairman, President or any Vice
     President and by its Secretary or an Assistant Secretary, by manual
     signatures or by facsimile signatures printed thereon, and shall have
     imprinted thereon a facsimile of the Company's seal.  Warrant Certificates
     shall be manually countersigned by the Warrant Agent and shall not be valid
     for any purpose unless so countersigned.  In case any officer of the
     Company who shall have signed any of the Warrant Certificates shall cease
     to be an officer of the Company or to hold the particular office referenced
     in the Warrant Certificate before the date of issuance of the Warrant
     Certificates or before countersignature by the Warrant Agent, such Warrant
     Certificates may nevertheless be countersigned by the Warrant Agent, issued
     and delivered with the same force and effect as though the person who
     signed such Warrant Certificates had not ceased to be an officer of the
     Company or to hold such office.  After countersignature by the Warrant
     Agent, Warrant Certificates shall be delivered by the Warrant Agent to the
     Registered Holder without further action by the Company, except as
     otherwise provided by Section 6.01 hereof. 

               SECTION 4.  Exercise.  Each Warrant may be exercised by the 
                           --------
     Registered Holder thereof at any time after issuance thereof, but not after
     the Warrant Expiration Date, upon the terms and subject to the conditions
     set forth herein and in the applicable Warrant Certificate.  A Warrant
     shall be deemed to have been exercised immediately prior to the close of
     business on the Exercise Date and the person entitled to receive the
     securities deliverable upon such exercise shall be treated for all purposes
     as the holder of those securities upon the exercise of the Warrant as of
     the close of business on the Exercise Date.  As soon as practicable on or
     after the Exercise Date the Warrant Agent shall deposit the proceeds
     received from the exercise of a Warrant and shall notify the Company in
     writing of the exercise of the Warrants.  Promptly following, and in any
     event within five days after the date of such notice from the Warrant
     Agent, the Warrant Agent, on behalf of the Company, shall cause to be
     issued and delivered by the Transfer Agent, to the person or persons
     entitled to receive the same, a certificate or certificates for the
     securities deliverable upon such exercise (plus a certificate for any
     remaining unexercised Warrants of the Registered Holder), unless prior to
     the date of issuance of such certificates the Company shall instruct the
     Warrant Agent to refrain from causing such issuance of certificates pending
     clearance of checks received in payment of the Exercise Price pursuant to
     such Warrants.  Upon the exercise of any Warrant and clearance of the funds
     received, the Warrant Agent shall promptly remit the payment received for
     the Warrant (the "Warrant Proceeds") to the Company or as the Company may
     direct in writing. 

               SECTION 5.  Reservation of Shares:  Listing:
                           --------------------------------
                           Payment of Taxes; etc.
                           ----------------------

               5.01  The Company covenants that it will at all times reserve and
     keep available out of its authorized Common Stock, solely for the purpose
     of issuance upon the exercise of the Warrants, such number of shares of
     Common Stock as shall then be issuable upon the exercise of all outstanding
     Warrants.  The Company covenants that all shares of Common Stock which
     shall be issuable upon exercise of the Warrants shall, at the time of
     delivery, be duly and validly issued, fully paid, nonassessable and free
     from all taxes, liens and charges with respect to the issuance thereof
     (other than those which the Company shall promptly pay or discharge), and
     that upon issuance such shares shall be listed on each national securities
     exchange or eligible for inclusion in each automated quotation system, if
     any, on which the other shares of outstanding Common Stock of the Company
     are then listed or eligible for inclusion. 

               5.02  The Company covenants that if any securities to be reserved
     for the purpose of exercise of Warrants hereunder require registration
     with, or approval of, any governmental authority under any federal
     securities law before such securities may be validly issued or delivered
     upon such exercise, then the Company will in good faith and as
     expeditiously as reasonably possible, endeavor to secure such registration
     or approval.  The Company will use reasonable efforts to obtain appropriate
     approvals or registrations under state "blue sky" securities laws.  With
     respect to any such securities, however, Warrants may not be exercised by,
     or shares of Common Stock issued to, any Registered Holder in any state in
     which such exercise would be unlawful. 

               5.03  The Company shall pay all documentary, stamp or similar
     taxes and other governmental charges that may be imposed with respect to
     the issuance of the Warrants, or the issuance, or delivery of any shares
     upon exercise of the Warrants; provided, however, that if the shares of
     Common Stock are to be delivered in a name other than the name of the
     Registered Holder of the Warrant Certificate representing any Warrant being
     exercised, then no such delivery shall be made unless the person requesting
     the same has paid to the Warrant Agent the amount of transfer taxes or
     charges incident thereto, if any. 

               5.04  The Warrant Agent is hereby irrevocably authorized to
     requisition the Company's Transfer Agent from time to time for certificates
     representing shares of Common Stock issuable upon exercise of the Warrants,
     and the Company will authorize the Transfer Agent to comply with all such
     proper requisitions.  The Company will file with the Warrant Agent a
     statement setting forth the name and address of the Transfer Agent of the
     Company for shares of Common Stock issuable upon exercise of the Warrants. 

               SECTION 6.  Exchange and Registration of Transfer.  
                           -------------------------------------

               6.01  Warrant Certificates may be exchanged for other Warrant
     Certificates representing an equal aggregate number of Warrants of the same
     class or may be transferred in whole or in part.  Warrant Certificates to
     be exchanged shall be surrendered to the Warrant Agent at its Corporate
     Office, and upon satisfaction of the terms and provisions hereof, the
     Company shall execute and the Warrant Agent shall countersign, issue and
     deliver in exchange therefor the Warrant Certificate or Certificates which
     the Registered Holder making the exchange shall be entitled to receive. 

               6.02  The Warrant Agent shall keep at its office books in which,
     subject to such reasonable regulations as it may prescribe, it shall
     register Warrant Certificates and the transfer thereof in accordance with
     its regular practice.  Upon due presentment for registration of transfer of
     any Warrant Certificate at such office, the Company shall execute and the
     Warrant Agent shall issue and deliver to the transferee or transferees a
     new Warrant Certificate or Certificates representing an equal aggregate
     number of Warrants. 

               6.03  With respect to all Warrant Certificates presented for
     registration or transfer, or for exchange or exercise, the subscription
     form on the reverse thereof shall be duly endorsed, or be accompanied by a
     written instrument or instruments of transfer and subscription, in form
     satisfactory to the Company and the Warrant Agent, duly executed by the
     Registered Holder or his attorney-in-fact duly authorized in writing. 

               6.04  A service charge may be imposed by the Warrant Agent for
     any exchange, registration or transfer of Warrant Certificates.  In
     addition, the Company may require payment by such holder of a sum
     sufficient to cover any tax or other governmental charge that may be
     imposed in connection therewith. 

               6.05  All Warrant Certificates surrendered for exercise or for
     exchange in the case of mutilated Warrant Certificates shall be promptly
     cancelled by the Warrant Agent and thereafter retained by the Warrant Agent
     until termination of this Agreement or its resignation as Warrant Agent,
     or, with the prior written consent of Company, disposed of or destroyed, at
     the direction of the Company. 

               6.06  Prior to due presentment for registration of transfer
     thereof, the Company and the Warrant Agent may deem and treat the
     Registered Holder of any Warrant Certificate as the absolute owner thereof
     and of each Warrant represented thereby (notwithstanding any notations of
     ownership or writing thereon made by anyone other than a duly authorized
     officer of the Company or the Warrant Agent) for all purposes and shall not
     be affected by any notice to the contrary. 

               SECTION 7.  Loss or Mutilation.  Upon receipt by the Company and
                           ------------------
     the Warrant Agent of evidence satisfactory to them of the ownership of and
     loss, theft, destruction or mutilation of any Warrant Certificate and (in
     case of loss, theft or destruction) of indemnity satisfactory to them, and
     (in the case of mutilation) upon surrender and cancellation thereof, the
     Company shall execute and the Warrant Agent shall (in the absence of notice
     to the Company and/or Warrant Agent that the Warrant Certificate has been
     acquired by a bona fide purchaser) countersign and deliver to the
     Registered Holder in lieu thereof a new Warrant Certificate of like tenor
     representing an equal aggregate number of Warrants.  Applicants for a
     substitute Warrant Certificate shall comply with such other reasonable
     regulations and pay such other reasonable charges as the Warrant Agent may
     prescribe. 

               SECTION 8.  Redemption.
                           ----------

               8.01  The Warrants may be redeemed, at the option of the Company,
     at a redemption price of $.05 per Warrant, at any time after the average
     Market Price for any twenty (20) consecutive Trading Days of the Warrant
     Shares shall have been equal to or exceeded $4.50 per share (the "Target
     Price"), subject to adjustment as set forth in Section 8.06 hereof.  The
     Company may exercise its option by giving irrevocable notice thereof to the
     Warrant Agent not later than ten (10) Trading Days following the end of any
     such twenty consecutive (20) Trading Day period.  All outstanding Warrants
     must be redeemed if any Warrants are to be redeemed. 

               8.02  If the conditions set forth in Section 8.01 hereof are met,
     the Company shall mail, or cause to be mailed, as soon as possible (and in
     no event more than five (5) Trading Days) following the delivery of the
     notice to the Warrant Agent referred to in Section 8.01 hereof, a notice of
     redemption to each of the Registered Holders of the Warrants to be
     redeemed, first class, postage prepaid, not more than thirty (30) days nor
     less than twenty (20) days before the date fixed for redemption, at their
     last address as it shall appear on the records maintained pursuant to
     Section 6.02 hereof.  Any notice mailed in the manner provided herein shall
     be conclusively presumed to have been duly given whether or not the
     Registered Holder receives such notice.  The Company shall also give notice
     of election to redeem, within the period provided above, by issuing a
     release to that effect to the Dow Jones News Service.

               8.03  The notice of redemption shall specify (i) the redemption
     price, (ii) the date fixed for redemption, (iii) the place where the
     Warrant Certificates shall be delivered and the redemption price paid and
     (iv) that the right to exercise the Warrant shall terminate at 5:00 P.M.
     (New York time) on the business day immediately preceding the date fixed
     for redemption.  The date fixed for the redemption of the Warrants shall be
     the Redemption Date.  No failure to mail such notice nor any defect therein
     or in the mailing thereof shall affect the validity of the proceedings for
     such redemption except as to a Registered Holder (a) to whom notice was not
     mailed or (b) whose notice was defective.  An affidavit of the Warrant
     Agent or of the Secretary or an Assistant Secretary of the Company that
     notice of redemption has been mailed shall, in the absence of fraud, be
     prima facie evidence of the facts stated therein. 

               8.04  Any right to exercise a Warrant shall terminate at 5:00
     P.M. (New York time) on the business day immediately preceding the
     Redemption Date.  On and after the Redemption Date, Holders of the Warrants
     shall have no further rights except to receive, upon surrender of the
     Warrant, the Redemption Price. 

               8.05  From and after the Redemption Date, the Company shall, at
     the place specified in the notice of redemption, upon presentation and
     surrender to the Company by or on behalf of the Registered Holder thereof
     of one or more Warrant Certificates evidencing Warrants to be redeemed,
     deliver or cause to be delivered to or upon the written order of such
     Holder a sum in cash equal to the redemption price of each such Warrant. 
     From and after the Redemption Date and upon the deposit or setting aside by
     the Company of a sum sufficient to redeem all of the Warrants called for
     redemption, such Warrants shall expire and become void and all rights
     hereunder and under the Warrant Certificates, except the right to receive
     payment of the redemption price, shall cease. 

               8.06  If the shares of Common Stock are subdivided or combined
     into a greater or smaller number of shares of Common Stock, the Target
     Price shall be proportionally adjusted by the ratio which the total number
     of shares of Common Stock outstanding immediately prior to such event bears
     to the total number of shares of Common Stock to be outstanding immediately
     after such event. 

               SECTION 9.  Adjustment of Exercise Price and Number
                           ---------------------------------------
                           of Shares of Common Stock or Warrants. 
                           -------------------------------------

               9.01  (a)   The Exercise Price, the number of Warrant Shares
     purchasable upon exercise of each Warrant and the number of Warrants
     outstanding are subject to adjustment from time to time upon the occurrence
     of the events enumerated in this Section 9.  In the event the Company
     shall, at any time or from time to time after the Effective Date, issue any
     shares of Common Stock as a stock dividend to the holders of Common Stock,
     or subdivide or combine the outstanding shares of Common Stock into a
     greater or lesser number of shares (any such sale, issuance, subdivision or
     combination being herein called a "Change of Shares"), then, and thereafter
     upon each further Change of Shares, the Exercise Price in effect
     immediately prior to such Change of Shares shall be changed to a price
     (including any applicable fraction of a cent) determined by multiplying the
     Exercise Price in effect immediately prior thereto by a fraction, the
     numerator of which shall be the number of shares of Common Stock
     outstanding immediately prior to the issuance of such additional shares,
     and the denominator of which shall be the sum of the number of shares of
     Common Stock outstanding immediately after the issuance of such additional
     shares.  Such adjustment shall be made successively whenever such an
     issuance is made. 

                     (b)   Upon each adjustment of the Exercise Price pursuant
     to this Section 9, the total number of shares of Common Stock purchasable
     upon the exercise of each Warrant shall (subject to the provisions
     contained in Section 9.02 hereof) be such number of shares (calculated to
     the nearest tenth) purchasable at the Exercise Price in effect immediately
     prior to such adjustment multiplied by a fraction, the numerator of which
     shall be the Exercise Price in effect immediately prior to such adjustment
     and the denominator of which shall be the Exercise Price in effect
     immediately after such adjustment. 

               9.02  The Company may elect, upon any adjustment of the Exercise
     Price hereunder, to adjust the number of Warrants outstanding, in lieu of
     the adjustment in the number of Warrant Shares purchasable upon the
     exercise of each Warrant as hereinabove provided, so that each Warrant
     outstanding after such adjustment shall represent the right to purchase one
     share of Common Stock.  Each Warrant held of record prior to such
     adjustment of the number of Warrants shall become that number of Warrants
     (calculated to the nearest tenth) determined by multiplying the number one
     by a fraction, the numerator of which shall be the Exercise Price in effect
     immediately prior to such adjustment and the denominator of which shall be
     the Exercise Price in effect immediately after such adjustment.  Upon each
     adjustment of the number of Warrants pursuant to this Section 9, the
     Company shall, as promptly as practicable, cause to be distributed to each
     Registered Holder of Warrant Certificates on the date of such adjustment
     Warrant Certificates evidencing, subject to Section 10 hereof, the number
     of additional Warrants to which such Holder shall be entitled as a result
     of such adjustment or, at the option of the Company, cause to be
     distributed to such Holder in substitution and replacement for the Warrant
     Certificates held by him prior to the date of adjustment (and upon
     surrender thereof, if required by the Company) new Warrant Certificates
     evidencing the number of Warrants to which such Holder shall be entitled
     after such adjustment. 

               9.03  In case of any reclassification, capital reorganization or
     other change of outstanding shares of Common Stock, or in case of any
     consolidation or merger of the Company with or into another corporation
     (other than a consolidation or merger in which the Company is the
     continuing corporation and which does not result in any reclassification,
     capital reorganization or other change of outstanding shares of Common
     Stock), or in case of any sale or conveyance to another corporation of the
     property of the Company as, or substantially as, an entirety (other than a
     sale/leaseback, mortgage or other financing transaction), the Company shall
     cause effective provision to be made so that each holder of a Warrant then
     outstanding shall have the right thereafter, by exercising such Warrant, to
     purchase the kind and number of shares of stock or other securities or
     property (including cash) receivable upon such reclassification, capital
     reorganization or other change, consolidation, merger, sale or conveyance
     by a holder of the number of shares of Common Stock that might have been
     purchased upon exercise of such Warrant immediately prior to such
     reclassification, capital reorganization or other change, consolidation,
     merger, sale or conveyance.  Any such provision shall include provision for
     adjustments that shall be as nearly equivalent as may be practicable to the
     adjustments provided for in this Section 9.  The Company shall not effect
     any such consolidation, merger or sale unless prior to or simultaneously
     with the consummation thereof the successor (if other than the Company)
     resulting from such consolidation or merger or the corporation purchasing
     assets or other appropriate corporation or entity shall assume, by written
     instrument executed and delivered to the Warrant Agent, the obligation to
     deliver to the holder of each Warrant such shares of stock, securities or
     assets as, in accordance with the foregoing provisions, such holders may be
     entitled to purchase and the other obligations under this Agreement.  The
     foregoing provisions shall similarly apply to successive reclassifications,
     capital reorganizations and other changes of outstanding shares of Common
     Stock and to successive consolidations, mergers, sales or conveyances. 

               9.04  If at any time after the Effective Date the Company shall
     fix a record date for the making of a distribution to all holders of its
     Common Stock of evidences of its indebtedness or assets (excluding cash
     distributions made as a dividend payable out of earnings or out of surplus
     legally available for dividends under the laws of the jurisdiction of the
     Company), or securities convertible into Common Stock of the Company, then
     in each case the Exercise Price in effect immediately prior to such record
     date shall be decreased to an amount determined by multiplying such
     Exercise Price by a fraction, the numerator of which is the Market Price on
     such record date less the then fair market value per share of Common Stock
     (as determined by the Board of Directors of the Company, whose
     determination shall be conclusive and described in a statement filed with
     the Warrant Agent) of the assets or evidences of indebtedness so
     distributed, and the denominator of which is the Market Price on such date.
     The number of shares of Common Stock purchasable on such record date shall
     be increased to a number of shares equal to (i) the number of shares of
     Common Stock purchasable on such record date multiplied by the Exercise
     Price in effect immediately prior to the adjustment required by the
     preceding sentence, divided by (ii) the adjusted Exercise Price computed
     pursuant to the immediately preceding sentence.  Such adjustments shall be
     made successively whenever such a record date is fixed and, in the event
     that such distribution is not so made, the Exercise Price and the number of
     shares of Common Stock purchasable upon exercise of the Warrants shall be
     adjusted to the Exercise Price and the number of shares which were in
     effect prior to such record date. 

               9.05  Irrespective of any adjustments or changes in the Exercise
     Price or the number of shares of Common Stock purchasable upon exercise of
     the Warrants, the Warrant Certificates theretofore and thereafter issued
     shall, unless the Company shall exercise its option to issue new Warrant
     Certificates pursuant to Section 2.04 hereof, continue to express the
     Exercise Price per share, the number of shares purchasable thereunder and
     the Redemption Price therefor as the Exercise Price per share, and the
     number of shares purchasable and the Redemption Price therefore were
     expressed in the Warrant Certificates when the same were originally issued.

               9.06  After each adjustment of the Exercise Price pursuant to
     this Section 9, the Company will promptly prepare a certificate signed by
     the Chairman or President, and by the Treasurer or an Assistant Treasurer
     or the Secretary or an Assistant Secretary, of the Company setting forth: 
     (i) the Exercise Price as so adjusted, (ii) the number of shares of Common
     Stock purchasable upon exercise of each Warrant after such adjustment, and,
     if the Company shall have elected to adjust the number of Warrants, the
     number of Warrants to which the registered holder of each Warrant shall
     then be entitled, and the adjustment in Redemption Price resulting
     therefrom, and (iii) a brief statement of the facts as shall be necessary
     to show the reason for and manner of computing such adjustment.  The
     Company will promptly file such certificate with the Warrant Agent and
     cause a brief summary hereof to be sent by ordinary first class mail to
     each Registered Holder of Warrants at his last address as it shall appear
     on the registry books of the Warrant Agent.  No failure to mail such notice
     nor any defect therein or in the mailing thereof shall affect the validity
     thereof except as to a Registered Holder (a) to whom notice was not mailed
     or (b) whose notice was defective.  The affidavit of an officer of the
     Warrant Agent or the Secretary or an Assistant Secretary of the Company
     that such notice has been mailed shall, in the absence of fraud, be prima
     facie evidence of the facts stated therein. 

               9.07  For purposes of Sections 9.01, 9.02 and 9.04 hereof, the
     following shall also be applicable: 

                    (a)  The number of shares of Common Stock outstanding at any
     given time shall not include shares of Common Stock owned or held by or for
     the account of the Company, and the distribution of any such treasury
     shares shall not be considered a Change of Shares for purposes of said
     Sections. 

                    (b)  No adjustment of the Exercise Price shall be made
     unless such adjustment would require an increase or decrease of at least
     $.05 in such Price; provided that any adjustments which by reason of this
     clause (b) are not required to be made shall be carried forward and shall
     be made at the time of and together with the next subsequent adjustment
     which, together with any adjustment(s) so carried forward, shall require an
     increase or decrease of at least $.05 in the Exercise Price then in effect
     hereunder. 

               9.08  As used in this Section 9, the term "Common Stock" means
     and includes the Common Stock authorized on the Effective Date and shall
     also include any capital stock of any class of the Company thereafter
     authorized which shall not be limited to a fixed sum or percentage in
     respect of the rights of the holders thereof to participate in dividends
     and in the distribution of assets upon the voluntary liquidation,
     dissolution or winding up of the Company; provided, however, that the
     shares issuable upon exercise of the Warrants shall include only shares of
     such class designated in the Company's Certificate of Incorporation as
     Common Stock on the Effective Date or (i), in the case of any
     reclassification, change, consolidation, merger, sale or conveyance of the
     character referred to in Section 9.03 hereof, the stock, securities or
     property provided for in such section or (ii), in the case of any
     reclassification or change in the outstanding shares of Common Stock
     issuable upon exercise of the Warrants as a result of a subdivision or
     combination or consisting of a change in par value, or from par value to no
     par value, or from no par value to par value, such shares of Common Stock
     as so reclassified or changed. 

               9.09  Any determination as to whether an adjustment in the
     Purchase Price in effect hereunder is required pursuant to Section 9, or as
     to the amount of any such adjustment, if required, shall be binding and
     conclusive upon the holders of the Warrants and the Company if made in good
     faith by the Board of Directors of the Company (or the Board of Directors
     of any corporation which is a successor as provided form Section 9.03
     hereof).  The Board of Directors shall have the power to resolve any
     ambiguity or correct any error in this Section 9.

               9.10  If and whenever the Company shall grant to the holders of
     Common Stock, as such, rights or warrants to subscribe for or to purchase,
     or any options for the purchase of, Common Stock or securities convertible
     into or exchangeable for or carrying a right, warrant or option to purchase
     Common Stock, the Company shall concurrently therewith grant to each
     Registered Holder as of the record date for such transaction of the
     Warrants then outstanding, the rights, warrants or options to which each
     Registered Holder would have been entitled if, on the record date used to
     determine the stockholders entitled to the rights, warrants or options
     being granted by the Company, the Registered Holder were the holder of
     record of the number of whole shares of Common Stock then issuable upon
     exercise of his Warrants.  Such grant by the Company to the holders of the
     Warrants shall be in lieu of any adjustment which otherwise might be called
     for pursuant to this Section 9. 

               9.11  The Company may, at its option, at any time until the
     Expiration Date, reduce the then current Exercise Price to any amount
     deemed appropriate by the Board of Directors of the Company for any period
     of at least twenty (20) consecutive Trading Days (as evidenced in a
     resolution adopted by such Board of Directors).  The Company shall mail, or
     cause to be mailed, a notice of the reduction in the Exercise Price as
     provided in this Section to each of the Registered Holders of the Warrants
     first class, postage prepaid, not later than the twentieth day before the
     commencement of such reduced Exercise Price, at their last address as it
     shall appear on the records maintained pursuant to Section 6.02 hereof. 
     Any notice mailed in the manner provided herein shall be conclusively
     presumed to have been duly given whether or not the Registered Holder
     receives such notice.  The Company shall also give notice of the reduction
     in the Exercise Price, within the time provided above, by issuing a release
     to that effect to the Dow Jones News Service.

               SECTION 10.  Fractional Warrants and Fractional Shares.
                            -----------------------------------------

               10.01  If the number of shares of Common Stock purchasable upon
     the exercise of each Warrant is adjusted pursuant to Section 9 hereof, the
     Company nevertheless shall not be required to issue fractions of shares,
     upon exercise of the Warrants or otherwise, or to distribute certificates
     that evidence fractional shares.  With respect to any fraction of a share
     called for upon any exercise hereof, the Company shall pay to the Holder an
     amount in cash equal to such fraction multiplied by the current market
     value of such fractional share, determined as follows: 

                    (i)  If the Common Stock is listed on a national securities
               exchange or admitted to unlisted trading on privileges on such
               exchange or listed for trading on the Nasdaq System, the current
               value shall be the Market Price of the Common Stock on such
               exchange or System on the last business day prior to the date of
               exercise of this Warrant or if no such sale is made on such day,
               the average of the closing bid and asked prices for such day on
               such exchange or System; or 

                    (ii) If the Common Stock is not listed or admitted to
               unlisted trading privileges, the current value shall be the mean
               of the last reported bid and asked prices reported by the
               National Quotation Bureau, Inc. on the last business day prior to
               the date of the exercise of this Warrant; or 

                    (iii) If the Common Stock is not so listed or admitted to
               unlisted trading privileges and bid and asked prices are not so
               reported, the current value shall be an amount determined in such
               reasonable manner as may be prescribed by the Board of Directors
               of the Company. 

               SECTION 11.  Warrant Holders Not Deemed Stockholders.  No 
                            ---------------------------------------
     Registered Holder of Warrants shall, as such, be entitled to vote or to
     receive dividends or be deemed the holder of Common Stock that may at any
     time be issuable upon exercise of such Warrants for any purpose whatsoever,
     nor shall anything contained herein be construed to confer upon the
     Registered Holder of Warrants, as such, any of the rights of a stockholder
     of the Company or any right to vote for the election of directors or upon
     any matter submitted to stockholders at any meeting thereof, or to give or
     withhold consent to any corporate action (whether upon any
     recapitalization, issue or reclassification of stock, change of par value
     or change of stock to no par value, consolidation, merger or conveyance or
     otherwise), or to receive notice of meetings, or to receive dividends or
     subscription rights, until such Holder shall have exercised such Warrants
     and been issued shares of Common Stock in accordance with the provisions
     hereof. 

               SECTION 12.  Notices to Warrant Holders.  So long as this Warrant
                            --------------------------
     shall be outstanding, (i) if the Company shall pay any dividend (other than
     a cash dividend from earnings) or make any distribution upon the Common
     Stock, (ii) if the Company shall offer to the holders of Common Stock for
     subscription or purchase by them any share of any class, evidences of its
     indebtedness or assets, convertible securities or any other rights or (iii)
     if any capital reorganization of the Company, reclassification of the
     capital stock of the Company, consolidation or merger of the Company with
     or into another corporation, sale, lease or transfer of all or
     substantially all of the property and assets of the Company to another
     corporation, or voluntary or involuntary dissolution, liquidation or
     winding up of the Company shall be effected, then in any such case, the
     Company shall cause to be mailed by first class, postage prepaid to the
     Holder, at least fifteen (15) days prior the date specified in (x) or (y)
     below, as the case may be, a notice containing a brief description of the
     proposed action and stating the date on which (x) a record is to be taken
     for the purpose of such dividend, distribution or rights, or (y) such
     reclassification, reorganization, consolidation, merger, conveyance, lease,
     dissolution, liquidation or winding up is to take place and the date, if
     any is to be fixed, as of which the holders of Common Stock or other
     securities shall receive cash or other property deliverable upon such
     reclassification, reorganization, consolidation, merger, conveyance,
     dissolution, liquidation or winding up. 

               SECTION 13.    Registration Under The Securities Act Of 1933. 
                              ---------------------------------------------
     The Company will use its best efforts to effect the registration of the
     shares of Common Stock issuable upon the exercise of the Warrants (the
     "Warrant Shares"), and in connection therewith, the Company will as
     expeditiously as practicable prepare and file with the Securities and
     Exchange Commission a registration statement (the "Registration Statement")
     under the Securities Act of 1933, as amended (the "Act"), and use its best
     efforts to cause such Registration Statement to become effective.  The
     Company will use its best efforts to maintain such Registration Statement
     current under the Act while any of the Warrants are outstanding, subject to
     discontinuance of any exercises while the prospectus included in the
     Registration Statement is in need of revision, provided that the Company
     will use its best efforts to amend or supplement or to reinstate the
     Registration Statement, as appropriate, as promptly as practicable.  The
     Company may include securities in addition to the Warrant Shares in the
     Registration Statement or include the Warrant Shares in a registration
     statement being filed by the Company with respect to other securities of
     the Company.  The Company shall bear the entire cost and expense of any
     Registration Statement initiated by it under this Section 13.  The Company
     shall supply prospectuses and other documents as the Holder may request 
     and shall qualify the Warrant Shares for sale in such jurisdictions as
     requested, provided, however, that the Company reserves the right, in its
     sole discretion, not to qualify the Warrant Shares in any jurisdiction
     where the Company would be required to qualify as a foreign corporation and
     is not otherwise required to be qualified therein.  

               SECTION 14.  Rights of Action.  All rights of action with respect
                            ----------------
     to this Agreement are vested in the respective Registered Holders of the
     Warrants.  Any Registered Holder of a Warrant, without consent of the
     Warrant Agent or of the Holder of any other Warrant, may, in his own behalf
     and for his own benefit, enforce against the Company his right to exercise
     his Warrants for the purchase of Warrant Shares in the manner provided in
     the Warrant Certificate and this Agreement. 

               SECTION 15.  Agreement of Warrant Holders.  Every Holder of a 
                            ----------------------------
     Warrant, by his acceptance thereof, consents and agrees with the Company,
     the Warrant Agent and every other Holder of a Warrant that: 

                    (a)  The Warrants are transferable only on the registry
     books of the Warrant Agent by the Registered Holder thereof in person or by
     his attorney duly authorized in writing and only if the Warrant
     Certificates representing such Warrants are surrendered at the office of
     the Warrant Agent, duly endorsed or accompanied by a proper instrument of
     transfer satisfactory to the Warrant Agent and the Company in their sole
     discretion, together with payment of any applicable transfer taxes.

                    (b)  The Company and the Warrant Agent may deem and treat
     the person in whose name the Warrant Certificate is registered as the
     Holder and as the absolute, true and lawful owner of the Warrants
     represented thereby for all purposes, and neither the Company nor the
     Warrant Agent shall be affected by any notice or knowledge to the contrary,
     except as otherwise expressly provided in Section 7 hereof. 

               SECTION 16.  Cancellation of Warrant Certificates.  If the 
                            ------------------------------------
     Company shall purchase or acquire any Warrant or Warrants, the Warrant
     Certificate or Warrant Certificates evidencing the same shall thereupon be
     delivered to the Warrant Agent and cancelled by it and retired.  The
     Warrant Agent shall also cancel any Warrant Certificate following exercise
     of any or all of the Warrants represented thereby or delivered to it for
     transfer, split-up, combination or exchange. 

               SECTION 17.  Concerning the Warrant Agent.
                            ----------------------------

               17.01  The Warrant Agent acts hereunder as agent and in a
     ministerial capacity for the Company, and its duties shall be determined
     solely by the provisions hereof.  The Warrant Agent shall not, by issuing
     and delivering Warrant Certificates or by any other act hereunder be deemed
     to make any representations as to the validity, value or authorization of
     the Warrant Certificates or the Warrants represented thereby or of any
     securities or other property delivered upon exercise of any Warrant or
     whether any stock issued upon exercise of any Warrant is fully paid and
     nonassessable. 

               17.02  The Warrant Agent shall not at any time be under any duty
     or responsibility to any holder of Warrant Certificates to make or cause to
     be made any adjustment of the Exercise Price or the Redemption Price
     provided in this Agreement, or to determine whether any fact exists which
     may require any such adjustments, or with respect to the nature or extent
     of any such adjustment, when made, or with respect to the method employed
     in making the same.  It shall not (i) be liable for any recital or
     statement of facts contained herein or for any action taken, suffered or
     omitted by it in reliance on any Warrant Certificate or other document or
     instrument believed by it in good faith to be genuine and to have been
     signed or presented by the proper party or parties, (ii) be responsible for
     any failure on the part of the Company to comply with any of its covenants
     and obligations contained in this Agreement or in any Warrant Certificate,
     or (iii) be liable for any act or omission in connection with this
     Agreement except for its own negligence or wilful misconduct. 

               17.03  The Warrant Agent may at any time consult with counsel
     satisfactory to it and shall incur no liability or responsibility for any
     action taken, suffered or omitted by it in good faith in accordance with
     the opinion or advice of such counsel. 

               17.04  Any notice, statement, instruction, request, direction,
     order or demand of the Company shall be sufficiently evidenced by an
     instrument signed by the Chairman of the Board, Vice Chairman, President,
     any Vice President, its Secretary, or Assistant Secretary, (unless other
     evidence in respect thereof is herein specifically prescribed).  The
     Warrant Agent shall not be liable for any action taken, suffered or omitted
     by it in accordance with such notice, statement, instruction, request,
     direction, order or demand believed by it to be genuine. 

               17.05  The Company agrees to pay the Warrant Agent reasonable
     compensation for its services hereunder and to reimburse it for its
     reasonable expenses hereunder; it further agrees to indemnify the Warrant
     Agent and save it harmless against any and all losses, expenses and
     liabilities, including judgments, costs and counsel fees, for anything done
     or omitted by the Warrant Agent in the execution of its duties and powers
     hereunder except losses, expenses and liabilities arising as a result of
     the Warrant Agent's negligence or wilful misconduct. 

               17.06  The Warrant Agent may resign its duties and be discharged
     from all further duties and liabilities hereunder (except liabilities
     arising as a result of the Warrant Agent's own negligence or wilful
     misconduct), after giving thirty (30) days' prior written notice to the
     Company.  At least fifteen (15) days prior to the date such resignation is
     to become effective, the Warrant Agent shall cause a copy of such notice of
     resignation to be mailed to the Registered Holder of each Warrant
     Certificate at the Company's expense.  Upon such resignation, or any
     inability of the Warrant Agent to act as such hereunder, the Company shall
     appoint a new Warrant Agent in writing.  If the Company shall fail to make
     such appointment within a period of fifteen (15) days after it has been
     notified in writing of such resignation by the resigning Warrant Agent,
     then the Registered Holder of any Warrant Certificate may apply to any
     court of competent jurisdiction for the appointment of a new Warrant Agent.
     Any new Warrant Agent, whether appointed by the Company or by such a court,
     shall be a bank or trust company having a capital and surplus, as shown by
     its last published report to its stockholders, of not less than $10,000,000
     or a stock transfer company.  After acceptance in writing of such
     appointment by the new Warrant Agent is received by the Company, such new
     Warrant Agent shall be vested with the same powers, rights, duties and
     responsibilities as if it had been originally named herein as the Warrant
     Agent, without any further assurance, conveyance, act or deed; but if for
     any reason it shall be necessary or expedient to execute and deliver any
     further assurance, conveyance, act or deed, the same shall be done at the
     expense of the Company and shall be legally and validly executed and
     delivered by the resigning Warrant Agent.  Not later than the effective
     date of any such appointment the Company shall file notice thereof with the
     resigning Warrant Agent and shall forthwith cause a copy of such notice to
     be mailed to the Registered Holder of each Warrant Certificate. 

               17.07  Any corporation into which the Warrant Agent or any new
     Warrant Agent may be converted or merged or any corporation resulting from
     any consolidation to which the Warrant Agent or any new Warrant Agent shall
     be a party or any corporation succeeding to the trust business of the
     Warrant Agent shall be a successor Warrant Agent under this Agreement
     without any further act, provided that such corporation is eligible for
     appointment as successor to the Warrant Agent under the provisions of the
     preceding paragraph.  Any such successor Warrant Agent shall promptly cause
     notice of its succession as Warrant Agent to be mailed to the Company and
     to the Registered Holder of each Warrant Certificate. 

               17.08  The Warrant Agent, its subsidiaries and affiliates, and
     any of its or their officers or directors, may buy and hold or sell
     Warrants or other securities of the Company and otherwise deal with the
     Company in the same manner and to the same extent and with like effects as
     though it were not Warrant Agent.  Nothing herein shall preclude the
     Warrant Agent from acting in any other capacity for the Company or for any
     other legal entity. 

               SECTION 18.  Modification of Agreement.  The Warrant Agent and 
                            -------------------------
     the Company may by supplemental agreement make any changes or corrections
     in this Agreement (i) that they shall deem appropriate to cure any
     ambiguity or to correct any defective or inconsistent provision or manifest
     mistake or error herein contained or (ii) that they may deem necessary or
     desirable and which shall not adversely affect the interests of the
     Registered Holders of Warrant Certificates; provided, however, that this
                                                 --------  -------
     Agreement shall not otherwise be modified, supplemented or altered in any
     respect except with the consent in writing of the Registered Holders of
     Warrant Certificates representing not less than 50% of the Warrants then
     outstanding; and provided, further, that no change in the number or nature
                      --------  -------
     of the securities purchasable upon the exercise of any Warrant, or the
     Exercise Price therefor, or the acceleration of the Warrant Expiration
     Date, and no change in the redemption provisions of Section 8 hereof or the
     anti-dilution provisions of Section 9 hereof which would adversely affect
     the interests of any Registered Holder of Warrant Certificates, shall be
     made without the consent in writing of the Registered Holder of the Warrant
     Certificate representing such Warrant, other than such changes as are
     specifically prescribed by this Agreement as originally executed or are
     made in compliance with applicable law. 

               SECTION 19.  Notices.  All notices, requests, consents and other 
                            -------
     communications hereunder shall be in writing and shall be deemed to have
     been made when delivered or mailed first class mail, postage prepaid as
     follows:  if to the Registered Holder of a Warrant Certificate, at the
     address of such Holder as shown on the registry books maintained by the
     Warrant Agent; if to the Company, at 46 Jonspin Road, Wilmington,
     Massachusetts 01887, attention:  Chairman, or at such other address as may
     have been furnished to the Warrant Agent in writing by the Company. 

               SECTION 20.  Governing Law.  This Agreement shall be governed by
                            -------------
     and construed in accordance with the laws of the State of New York, without
     reference to principles of conflict of laws. 

               SECTION 21.  Binding Effect.  This Agreement shall be binding 
                            --------------
     upon and inure to the benefit of the Company and the Warrant Agent and
     their respective successors and assigns, and the Registered Holders from
     time to time of Warrant Certificates.  Nothing in this Agreement is
     intended or shall be construed to confer upon any other person any right,
     remedy or claim, in equity or at law, or to impose upon any other person
     any duty, liability or obligation. 

               SECTION 22.  Termination.  This Agreement shall terminate at the 
                            -----------
     close of business on the Expiration Date of all the Warrants or such
     earlier date upon which all Warrants have been exercised, except that the
     Warrant Agent shall account to the Company for cash held by it and the
     provisions of Section 15 hereof shall survive such termination. 

               SECTION 23.  Counterparts.  This Agreement may be executed in 
                            ------------
     several counterparts, which taken together shall constitute a single
     document. 


               IN WITNESS WHEREOF, the parties hereto have caused this Agreement
     to be duly executed as of the date first above written. 


                                  ADVANCED NMR SYSTEMS, INC.


                                  By: /s/ Jack Nelson
                                      --------------------------
                                        Jack Nelson, Chairman



                                  AMERICAN STOCK TRANSFER & TRUST COMPANY


                                  By: /s/ Geraldine Zarbo
                                      --------------------------
                                         Authorized Officer

      <PAGE>

                                                          Warrants for
                                                       the Purchase of
                                                          _____ Shares


                              VOID AFTER August 30, 2000

                        STOCK PURCHASE Warrant Certificate FOR
                               PURCHASE OF COMMON STOCK

                                          OF

                              ADVANCED NMR SYSTEMS, INC.


               This certifies that FOR VALUE RECEIVED, _______________ or
     registered assigns (the "Registered Holder") is the owner of the number of
     Common Stock Purchase Warrants (the "Warrants") specified above.  Each
     Warrant initially entitles the Registered Holder to purchase, subject to
     the terms and conditions set forth in this Certificate and the Warrant
     Agreement (as hereinafter defined), one fully paid and nonassessable share
     of Common Stock, $.01 par value, of Advanced NMR Systems, Inc., a Delaware
     corporation (the "Company") at any time after August 31, 1995 and prior to
     the Expiration Date (as hereinafter defined), upon the presentation and
     surrender of this Warrant Certificate with the Subscription Form on the
     reverse hereof duly executed, at the corporate office of American Stock
     Transfer & Trust Company as Warrant Agent, or its successor (the "Warrant
     Agent") accompanied by the payment of $3.75 or as may be adjusted (the
     "Exercise Price") in lawful money of the United States of America in cash
     or by official bank or certified check made payable to the Company.

               This Warrant Certificate and each Warrant represented hereby are
     issued pursuant to and are subject in all respects to the terms and
     conditions set forth in the Warrant Agreement (the "Warrant Agreement"),
     dated August 31, 1995, by and between the Company and the Warrant Agent.

               In the event of certain contingencies provided for in the Warrant
     Agreement, the Exercise Price or the number of shares of Common Stock
     subject to purchase upon the exercise of each Warrant represented hereby
     are subject to modification or adjustment.

               Each Warrant represented hereby is exercisable at the option of
     the Registered Holder, but no fractional shares of Common Stock will be
     issued.  In the case of the exercise of less than all the Warrants
     represented hereby, the Company shall cancel this Warrant Certificate upon
     the surrender hereof and shall execute and deliver a new Warrant
     Certificate or Warrant Certificates of like tenor, which the Warrant Agent
     shall countersign, for the balance of such Warrants.

               The term "Expiration Date" means 5:00 P.M. (New York time) on
     August 30, 2000, or such earlier date as the Warrants shall be redeemed. 
     If such date shall in the State of New York be a holiday or a day on which
     the banks are authorized to close, then the Expiration Date means 5:00 P.M.
     (New York time) the next following day which in the State of New York is
     not a holiday or a day on which banks are authorized to close.

               The Company shall not be obligated to deliver any securities
     pursuant to the exercise of this Warrant unless a registration statement
     under the Securities Act of 1933, as amended, with respect to such
     securities is effective.  The Company has covenanted and agreed that it
     will file a registration statement and will use its best efforts to cause
     the same to become effective and to keep such registration statement
     current while any of the Warrants are outstanding.  This Warrant shall not
     be exercisable by a Registered Holder in any jurisdiction where such
     exercise would be unlawful.

               This Warrant Certificate is exchangeable, upon the surrender
     hereof by the Registered Holder at the corporate office of the Warrant
     Agent, for a new Warrant Certificate or Warrant Certificates of like tenor
     representing an equal aggregate number of Warrants, each of such new
     Warrant Certificates to represent such number of Warrants as shall be
     designated by such Registered Holder at the time of such surrender.  Upon
     due presentment with any tax or other governmental charge imposed in
     connection therewith, for registration of transfer of this Warrant
     Certificate at such office, a new Warrant Certificate or Warrant
     Certificates representing an equal aggregate number of Warrants will be
     issued to the transferee in exchange therefor, subject to the limitations
     provided in the Warrant Agreement.

               Prior to the exercise of any Warrant represented hereby, the
     Registered Holder shall not be entitled to any rights of a stockholder of
     the Company, including, without limitation, the right to vote or to receive
     dividends or other distributions, and shall not be entitled to receive any
     notice of any proceedings of the Company, except as provided in the Warrant
     Agreement.

               This Warrant may be redeemed at the option of the Company, by
     giving irrevocable notice thereof to the Warrant Agent as provided in the
     Warrant Agreement, at a redemption price of $.05 per Warrant at any time
     after the Market Price (as defined in the Warrant Agreement) for the
     securities issuable upon exercise of such Warrant shall be equal to or
     exceed $4.50 per share for a period of twenty consecutive trading days. 
     Notice of redemption shall be given not earlier than the thirtieth or later
     than the twentieth day before the date fixed for redemption, all as
     provided in the Warrant Agreement.  On and after the date fixed for
     redemption, the Registered Holder shall have no rights with respect to this
     Warrant except to receive the $.05 per Warrant upon surrender of this
     Certificate.

               Prior to due presentment for registration of transfer hereof, the
     Company and the Warrant Agent may deem and treat the Registered Holder as
     the absolute owner hereof and of each Warrant represented hereby
     (notwithstanding any notations of ownership or writing hereon made by
     anyone other than a duly authorized officer of the Company or the Warrant
     Agent) for all purposes and shall not be affected by any notice to the
     contrary.

               This Warrant Certificate shall be governed by and construed in
     accordance with the laws of the State of New York.

               This Warrant Certificate is not valid unless countersigned by the
     Warrant Agent.

               IN WITNESS WHEREOF, the Company has caused this Warrant
     Certificate to be duly executed, manually or in facsimile by two of its
     officers thereunto duly authorized and a facsimile of its corporate seal to
     be imprinted hereon.

                                  ADVANCED NMR SYSTEMS, INC.


                                  By:_____________________________________
                                         Jack Nelson, Chairman

     Attest: ______________________
                    Secretary



                      [seal]



     Countersigned:

     AMERICAN STOCK TRANSFER & TRUST COMPANY 


     By:___________________________________
           Authorized Officer

     <PAGE>

                       [FORM OF REVERSE OF Warrant Certificate]

                                  SUBSCRIPTION FORM

                       To Be Executed by the Registered Holder
                            in Order to Exercise Warrants


               The undersigned Registered Holder hereby irrevocably elects to
     exercise _____________ Warrants represented by this Warrant Certificate,
     and to purchase the securities issuable upon the exercise of such Warrants,
     and requests that certificates for such securities shall be issued in the
     name of 

              PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER

                      __________________________________________
                      __________________________________________
                      __________________________________________
                      __________________________________________
                       [please print or type name and address]

     and be delivered to

                      __________________________________________
                      __________________________________________
                      __________________________________________
                      __________________________________________
                       [please print or type name and address]

     and if such number of Warrants shall not be all the Warrants evidenced by
     this Warrant Certificate, that a new Warrant Certificate for the balance of
     such Warrants be registered in the name of, and delivered to, the
     Registered Holder at the address stated below. 

     Dated:  ___________________   X__________________________________________

                                    __________________________________________

                                    __________________________________________
                                                 Address


                                   ___________________________________________
                                   Taxpayer Identification Number


                                   ___________________________________________
                                          Signature Guaranteed

                                   ___________________________________________

     <PAGE>

                                      ASSIGNMENT


                       To Be Executed by the Registered Holder
                             in Order to Assign Warrants


     FOR VALUE RECEIVED, ____________________________________ hereby
     sells, assigns and transfers unto


              PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER

                      __________________________________________
                      __________________________________________
                      __________________________________________
                      __________________________________________
                       [please print or type name and address]

     ______________________ of the Warrants represented by this Warrant
     Certificate, and hereby irrevocably constitutes and appoints
     _________________________________________________________________________
     Attorney to transfer this Warrant Certificate on the books of the Company,
     with full power of substitution in the premises. 

     Dated:   __________________  X__________________________________________

                                   Signature Guaranteed


                                   __________________________________________


     THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION FORM MUST CORRESPOND TO
     THE NAME AS WRITTEN UPON THE FACE OF THIS WARRANT CERTIFICATE IN EVERY
     PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER, AND
     MUST BE GUARANTEED BY A COMMERCIAL BANK OR TRUST COMPANY OR A MEMBER FIRM
     OF THE AMERICAN STOCK EXCHANGE, NEW YORK STOCK EXCHANGE, PACIFIC STOCK
     EXCHANGE OR MIDWEST STOCK EXCHANGE. 




                                                            EXHIBIT 10.2



                             LOAN AND SECURITY AGREEMENT

                             dated as of August 31, 1995

                                    by and between

                              MEDICAL DIAGNOSTICS, INC.

                                         and

                                    CHEMICAL BANK


          <PAGE>


                                  TABLE OF CONTENTS

                                                                       Page
                                                                       ----

                                                                          
          ARTICLE I   CERTAIN DEFINITIONS AND ACCOUNTING TERMS
          ----------------------------------------------------

               Section 1.01. Defined Terms............................
               Section 1.02. Use of Defined Terms.....................
               Section 1.03. Accounting Terms.........................

          ARTICLE II   AMOUNTS AND TERMS OF THE LOANS
          -------------------------------------------

               Section 2.01. Revolving Loans..........................
               Section 2.02. Request for Floating Rate Revolving
                             Loans....................................
               Section 2.03. Repayment of Principal of Revolving
                             Loans....................................
               Section 2.04. Interest Payments on Revolving
                             Loans....................................
               Section 2.05. Term Loan................................
               Section 2.06. Repayment of Principal of Term Loan......
               Section 2.07. Interest Payment on Term Loan............
               Section 2.08. LIBOR Loans..............................
               Section 2.09. Commitment Fees..........................
               Section 2.10. Rate Determination Protection............
               Section 2.11. Prepayment of LIBOR Loans................
               Section 2.12. Increased Costs; Capital Adequacy........
               Section 2.13. Illegality or Impossibility..............
               Section 2.14. Rate Adjustment..........................
               Section 2.15. Letters of Credit........................

          ARTICLE III   LOAN PROCEEDS AND PAYMENTS
          ----------------------------------------

               Section 3.01. Availability.............................
               Section 3.02. Payment Notices..........................
               Section 3.03. Use of Loan Proceeds.....................
               Section 3.04. Payments.................................
               Section 3.05. Payments on Non-Business Days............
               Section 3.06. Net Payments.............................

          ARTICLE IV   CONDITIONS OF LENDING
          ----------------------------------

               Section 4.01. Conditions Precedent to Initial Loan.....
               Section 4.02. Conditions Precedent to All Loans........

          ARTICLE V   SECURITY
          --------------------

               Section 5.01. Grant of Security Interest...............
               Section 5.02. Pledges; Further Grants
                             of Security..............................

          ARTICLE VI   REPRESENTATIONS AND WARRANTIES
          -------------------------------------------

               Section 6.01. Representations and Warranties...........

          ARTICLE VII   COVENANTS OF THE BORROWER
          ---------------------------------------

               Section 7.01. Affirmative Covenants Other
                             Than Reporting Requirements..............
               Section 7.02. Negative Covenants.......................
               Section 7.03. Reporting Requirements...................

          ARTICLE VIII   DEFAULT AND REMEDIES
          -----------------------------------

               Section 8.01. Events of Default........................
               Section 8.02. Rights and Remedies Upon Default.........
               Section 8.03. Set-Off..................................
               Section 8.04. Right to Cure............................
               Section 8.05. Letters of Credit........................

          ARTICLE IX   FURTHER PROVISIONS AS TO RECEIVABLES
          -------------------------------------------------

               Section 9.01. Furnishing Information...................
               Section 9.02. Disputes.................................
               Section 9.03. Collections..............................

          ARTICLE X   FURTHER RIGHTS OF THE BANK
          --------------------------------------

               Section 10.01. Further Assurances......................

          ARTICLE XI   MISCELLANEOUS
          --------------------------

               Section 11.01. No Waiver; Cumulative Remedies..........
               Section 11.02. Amendment, Waivers and Consents.........
               Section 11.03. Addresses for Notices, etc..............
               Section 11.04. Costs, Expenses and Taxes...............
               Section 11 05. Reduction and Termination...............
               Section 11.06. Representations and Warranties..........
               Section 11.07. Binding Effect; Assignment..............
               Section 11.08. Reproduction of Agreement...............
               Section 11.09. Consent to Jurisdiction.................
               Section 11.10. Governing Law...........................
               Section 11.11. Severability............................
               Section 11.12. Headings................................
               Section 11.13. Waiver of Trial by Jury.................


     <PAGE>


          LOAN AND SECURITY AGREEMENT dated as of August 31, 1995 between
     Medical Diagnostics, Inc., a Delaware corporation (the "Borrower") and
     Chemical Bank (the "Bank").

          The Borrower and the Bank, each party in consideration that the other
     joins herein, hereby act and agree as follows:

                                      ARTICLE I

                       CERTAIN DEFINITIONS AND ACCOUNTING TERMS

          Section 1.01.  Defined Terms.  As used in this Agreement or in any
                         -------------
     certificate or opinion delivered in connection with this Agreement, the
     following terms shall have the meanings set out respectively after each:

          "Acquisition" - Any purchase or other acquisition made by any Person
     of all or substantially all of the capital stock or other equity interests
     of any other Person or of all or substantially all of the assets of any
     other Person or of any line of business of another Person.

          "Adjusted LIBOR Rate" - For any Interest Period, an interest rate per
     annum, expressed as a percentage, determined by the Bank pursuant to the
     following formula:

                * ALR =    LIBOR    + LRI
                        -----------
                        [1.00 - RR]

            Where ALR = Adjusted LIBOR Rate
                LIBOR = See definition of LIBOR
                   RR = Reserve Rate
                  LRI =  the applicable LIBOR Rate Increment

          * ALR and each component thereof to be rounded upwards
            to the next higher 1/100 of 1%.

          "Advanced NMR" Advanced NMR Systems, Inc., a Delaware corporation.

          "Affiliate" - See Subsection 7.02(n).

          "Affiliate Guaranties" - Collectively, (i) that certain Guaranty and
     Security Agreement of even date herewith being given to the Bank by
     Advanced NMR and (ii) that certain Guaranty and Security Agreement of even
     date herewith being given to the Bank by the Guaranteeing Subsidiaries.

          "Affiliate Guarantor Collateral" - All collateral as to which the Bank
     has received, or is intended to receive, a security interest pursuant to
     any Affiliate Guaranty or any pledge agreement delivered pursuant to any
     Affiliate Guaranty.

          "Aggregate Revolving Loans" - The aggregate principal amount of all
     Revolving Loans outstanding at any one time.

          "Agreement" (as in "this Agreement") - This Loan and Security
     Agreement, as the same may be amended from time to time.

          "AMS" Advanced Mammography Systems Inc., a Delaware corporation.

          "Bank Certificate" - A certificate signed by an officer of the Bank
     setting forth any additional amount required to be paid by the Borrower to
     the Bank pursuant to Section 2.08, Section 2.11 or Section 2.12 of this
     Agreement, which certificate shall be submitted by the Bank to the Borrower
     in connection with each demand made at any time by the Bank upon the
     Borrower with respect to such additional amounts, and each such certificate
     shall, save for manifest error, constitute conclusive evidence of the
     additional amount required to be paid by the Borrower to the Bank upon each
     demand.  A claim by the Bank for all or any part of any additional amount
     required to be paid by the Borrower may be made before and/or after the end
     of the Interest Period to which such claim relates or during which such
     claim has arisen and before and/or after any payment hereunder to which
     such claim relates.  Each Bank Certificate shall set forth in reasonable
     detail the basis for and calculation of the claim to which it relates.

          "Base Rate" For any date, a rate per annum (rounded upward, if
     necessary, to the next higher 1/16 of 1%) equal to the greater of (a) the
     Prime Rate in effect on such date or (b) the sum of one-half of one (0.5%)
     percent per annum plus the Federal Funds Effective Rate in effect on such
     date.  If for any reason the Bank shall have determined (which
     determination shall be conclusive absent manifest error) that it is unable
     to ascertain the Federal Funds Effective Rate for any reason, including the
     inability or failure of the Bank to obtain sufficient quotations in
     accordance with the terms of the definition of "Federal Funds Effective
     Rate" below, the Base Rate shall be determined without regard to clause (b)
     of the first sentence of this definition until the circumstances giving
     rise to such inability no longer exist.

          "Borrower Collateral" - All of the property, rights and interests of
     the Borrower described in Subsections 5.01(a)-(g) or in any pledge
     agreement delivered pursuant to this Agreement.

          "Business Day - Any day which is not a Saturday, nor a Sunday, nor a
     public holiday under the laws of the United States of America or the State
     of New York applicable to a New York banking corporation or other day on
     which banks in New York, New York are authorized or directed to close; and,
     if the applicable provision relates to a LIBOR Loan, the term "Business
     Day" shall also not include any day on which dealings are not carried on in
     the London interbank market or on which banks are not open for business in
     London.

          "Capital Base" At any time, the sum of (i) the consolidated Tangible
     Net Worth of the Borrower and its Subsidiaries then existing, plus (ii) the
                                                                   ----
     principal amount of Subordinated Debt of the Borrower then outstanding
     (nothing contained in this definition being deemed to authorize the
     incurrence of any additional Subordinated Debt).

          "Capital Expenditures" - All acquisitions of machinery, equipment,
     land, leaseholds, buildings, leasehold improvements and all other
     expenditures for purposes which are considered to be fixed assets under
     generally accepted accounting principles consistently applied.  When a
     fixed asset is acquired by a lease which is required to be capitalized
     pursuant to generally accepted accounting principles, the amount required
     to be so capitalized shall be considered to be an expenditure in the year
     such asset is first leased.  

          "Charter" - The Certificate of Incorporation or other organizational
     document of a corporation referred to, in each case as amended to date.

          "Collateral" - Collectively, the Affiliate Guarantor Collateral and
     the Borrower Collateral.

          "Commitment" - The agreement of the Bank to make Loans to the Borrower
     pursuant to this Agreement.

          "Covenanted Subsidiaries" All Subsidiaries of the Borrower, now
     existing or hereafter acquired or created, other than Mass. Mobile Imaging
     Venture, Greater Springfield MRI Limited Partnership, MVA Rehabilitation
     Associates, Mobile MRI of Western Massachusetts Associates, Merrimack
     Scanning Associates and Western Massachusetts Magnetic Resonance Services,
     Inc..

          "Current Assets" As to any Person, all assets of such Person which are
     properly shown as current assets on a balance sheet of such Person prepared
     in accordance with generally accepted accounting principles consistently
     applied; excluding, however, any and all amounts due from affiliated
     entities.

          "Current Liabilities" As to any Person, all liabilities of such Person
     which are properly shown as current liabilities on a balance sheet of such
     Person prepared in accordance with generally accepted accounting principles
     consistently applied, including, without limitation, all capitalized lease
     payments and fixed prepayments of, and sinking fund payments with respect
     to, Indebtedness required to be made within one year from the date of
     determination.  "Current Liabilities" shall also and in any event be deemed
     to include the Revolving Loans.

          "Current Maturities" As at any date as of which same is to be
     determined, the total principal amount of Indebtedness of the Borrower then
     due or coming due or required to be paid within the next following 12
     months, including, without limitation, any Indebtedness payable on demand,
     all current maturities of long-term debt and any sinking fund installments
     in respect thereof and that current portion of any capitalized lease
     payment which is attributable to principal.

          "Debt Service Coverage Ratio" See Subsection 7.01(k).

          "Default" - Any event or circumstance which, with the passage of time
     or giving of notice or both, could become an Event of Default.

          "Determination Date" See Subsection 7.01(k).

          "EBIT" As determined for any period, the sum of:  (1) the consolidated
     Net Income (or consolidated Net Loss, expressed as a negative number) of
     the Borrower and its consolidated Subsidiaries (determined in accordance
     with generally accepted accounting principles) for such period, plus (2)
                                                                     ----
     all federal and state income taxes (but not taxes in the nature of an ad
                                                                           --
     valorem property tax or a sales or excise tax) paid or accrued by the
     -------
     Borrower with respect to such period and actually deducted on the
     consolidated books of the Borrower for the purposes of computation of
     consolidated Net Income (or consolidated Net Loss, as the case may be) of
     the Borrower and its Subsidiaries for such period, plus (3) all interest on
                                                        ----
     any Indebtedness paid by the Borrower or any Subsidiary of the Borrower
     during such period or accrued by the Borrower or any such Subsidiary for
     such period and in each case actually deducted on the consolidated books of
     the Borrower for the purposes of computation of consolidated Net Income (or
     consolidated Net Loss, as the case may be) of the Borrower and its
     Subsidiaries for the period involved.

          "EBITDA Available for Debt Service" - As determined for any period,
     the result of:  (1) the consolidated Net Income (or consolidated Net Loss,
     expressed as a negative number) of the Borrower and its Subsidiaries for
     such period (excluding from each item of revenue and expense derived from
     any Subsidiary which is not wholly-owned a pro rata share thereof
                                                --- ----
     representing minority interests), plus (2) all federal and state income
                                       ----
     taxes (but not taxes in the nature of an ad valorem property tax or a sales
                                              -- -------
     or excise tax) paid or accrued by the Borrower with respect to such period
     and actually deducted on the consolidated books of the Borrower for the
     purposes of computation of consolidated Net Income (or consolidated Net
     Loss, as the case may be) of the Borrower and its Subsidiaries for such
     period, plus (3) all interest on any Indebtedness paid by the Borrower or
             ----
     any Subsidiary of the Borrower during such period or accrued by the
     Borrower or any such Subsidiary for such period and in each case actually
     deducted on the consolidated books of the Borrower for the purposes of
     computation of consolidated Net Income (or consolidated Net Loss, as the
     case may be) of the Borrower and its Subsidiaries for the period involved
     (excluding, with respect to any interest paid by any of Mass. Mobile
     Imaging Venture, Greater Springfield MRI Limited Partnership and MVA
     Rehabilitation Associates, a pro rata share thereof representing minority
                                  --- ----
     interests), plus (4) the amount of the provision for depreciation and/or
                 ----
     amortization actually deducted on the consolidated books of the Borrower
     for the purposes of computation of consolidated Net Income (or consolidated
     Net Loss, as the case may be) of the Borrower and its Subsidiaries for such
     period (excluding, with respect to any such depreciation and/or
     amortization recorded by any of Mass. Mobile Imaging Venture, Greater
     Springfield MRI Limited Partnership and MVA Rehabilitation Associates, a
     pro rata share thereof representing minority interests), minus (5) the
     --- ----                                                 -----
     amount of all Capital Expenditures made by the Borrower and/or any of its
     Subsidiaries during the period involved and not financed as permitted under
     Subsection 7.02(a) below (excluding, with respect to any such non-financed
     Capital Expenditures which are made by any of Mass. Mobile Imaging Venture,
     Greater Springfield MRI Limited Partnership and MVA Rehabilitation
     Associates, a pro rata share thereof representing minority interests).
                   --- ----

          "ERISA" - See Subsection 6.01(l).

          "Eurocurrency Liabilities" - Has the meaning assigned to that term in
     Regulation D of the Board of Governors of the Federal Reserve System (or
     any successor), as in effect from time to time, or in any successor
     regulation relating to the liabilities described in said Regulation D.

          "Event of Default" - Any of the events specified in Section 8.01
     hereof.

          "Federal Funds Effective Rate" As determined for any day, the weighted
     average of the rates on overnight Federal funds transactions with members
     of the Federal Reserve System arranged by Federal funds brokers, as
     published on the next succeeding Business Day by the Federal Reserve Bank
     of New York, or, if such rate is not so published for any day which is a
     Business Day, the average of the quotations for such day for such
     transactions received by the Bank from three Federal funds brokers of
     recognized standing selected by the Bank in its discretion.

          "Floating Rate Loan" - Any Loan which bears interest at a rate
     calculated with reference to the Base Rate.

          "Floating Rate Revolving Loan" - Any Revolving Loan which is a
     Floating Rate Loan.

          "Guaranteeing Subsidiaries" The Subsidiaries listed on Exhibit A
     hereto, as well as any other Subsidiaries of the Borrower hereafter created
     or acquired. 

          "Guarantors" Collectively, Advanced NMR and each of the Guaranteeing
     Subsidiaries.

          "Impositions" - All present and future taxes, levies, duties,
     impositions, deductions, charges and withholdings applicable to the Bank
     with respect to any LIBOR Loan, excluding, however, any taxes imposed
     directly on the Bank's income and any franchise taxes imposed on it by the
     jurisdiction under the laws of which the Bank is organized or any political
     subdivision thereof.

          "Indebtedness" - The total of all obligations of a Person, whether
     current or long-term, senior or subordinated, which in accordance with
     generally accepted accounting principles would be included as liabilities
     upon such Person's balance sheet at the date as of which Indebtedness is to
     be determined, and shall also include such Person's liability in respect of
     guaranties, endorsements (other than for collection in the ordinary course
     of business) or other arrangements whereby responsibility is assumed for
     the obligations of others, whether by agreement to purchase or otherwise
     acquire the obligations of others, including any agreement, contingent or
     otherwise, to furnish funds through the purchase of goods, supplies or
     services for the purpose of payment of the obligations of others.

          "Interest Payment Date" - As to any LIBOR Loan, the last day of the
     Interest Period for such LIBOR Loan; provided, however, that if the
     Interest Period for a LIBOR Loan is longer than three months, then there
     will be two Interest Payment Dates for such LIBOR Loan, the first being at
     the expiration of three months from the date of the making of such LIBOR
     Loan and the second being the last day of such Interest Period.

          "Interest Period" - As to each LIBOR Loan, the period commencing with
     the date of the making of such LIBOR Loan and ending one, two, three or six
     months thereafter, as the Borrower may select pursuant to Section 2.08
     below; provided that (A) any such Interest Period which would otherwise end
     on a day which is not a Business Day shall be extended to the next
     succeeding Business Day unless such Business Day occurs in a new calendar
     month, in which case such Interest Period shall end on the immediately
     preceding Business Day; (B) any such Interest Period which begins on a day
     for which there is no numerically corresponding day in the calendar month
     during which such Interest Period is to end shall end on the last Business
     Day of such calendar month; (C) no Interest Period as to any Revolving Loan
     may be selected which would end after the Revolving Expiration Date; and
     (D) no Interest Period may be selected as to any portion of the Term Loan
     which would end after the date when such portion of the Term Loan becomes
     due and payable in accordance with the provisions of the Term Note.

          "Inventory" All goods now owned or hereafter acquired by the Borrower
     and intended for sale or lease, all raw materials, parts, work-in-process
     and finished goods, and all materials and supplies which are used or which
     may be used in manufacturing, selling, packing, shipping, advertising or
     furnishing of goods, whether now owned or hereafter acquired or created and
     wherever located, as well as all proceeds (including, without limitation,
     insurance proceeds) and products of any of the foregoing. 

          "LIBOR" - With respect to each Interest Period, that rate per annum
     (rounded upward, if necessary, to the nearest 1/16th of 1%) at which
     deposits in United States Dollars are offered to the Bank in the London
     interbank market by prime banks (as reasonably determined by the Bank), for
     a period coterminous with the term of such Interest Period and in an amount
     approximately equal to the principal amount of the LIBOR Loan to which such
     Interest Period is to apply, as determined by the Bank on that date which
     is two Business Days prior to the first day of the applicable Interest
     Period.

          "LIBOR Loan" - Any Loan which bears interest at an Adjusted LIBOR
     Rate.

          "LIBOR Rate Increment" Subject to Section 2.14 below, as to Revolving
     Loans 2.5; and (subject to Section 2.14 below) as to all or any portion of
     the Term Loan which becomes a LIBOR Loan 3.0.

          "LIBOR Rate Revolving Loan" Any Revolving Loan which is a LIBOR Loan.

          "Loan" - Any obligation (matured or unmatured) of the Borrower to the
     Bank now or hereafter arising under or in respect of this Agreement
     (including, without limitation, any Revolving Loan and the Term Loan).

          "London" - The City of London in England.

          "Material Adverse Effect" Any act, omission or circumstance which
     could reasonably be expected to have a material adverse effect on (i) the
     business, prospects, affairs, operations or condition of the Borrower and
     the Guaranteeing Subsidiaries taken as a whole, or (ii) the ability of the
     Borrower to carry out its obligations under this Agreement, the Notes
     and/or any of the other documents delivered by the Borrower hereunder or
     (iii) the validity or enforceability of this Agreement, the Notes and/or
     any of such other documents.

          "Measurement Period" See Subsection 7.01(k).

          "Merger" The merger of Old MDI with and into ANMR Acquisition Corp.,
     the resulting corporation being a wholly-owned Subsidiary of Advanced NMR
     which is changing its name to "Medical Diagnostics, Inc.".

          "Net Income" (or "Net Loss") - The book net income (or book net loss,
     as the case may be) of a Person for any period, after all taxes actually
     paid or accrued and all expenses and other charges determined in accordance
     with generally accepted accounting principles consistently applied.

          "Net Working Capital" The amount by which Current Assets exceed
     Current Liabilities.

          "Notes" - Collectively, the Revolving Note and the Term Note.

          "Obligations" See Section 5.01.

          "Officer's Certificate" - A certificate delivered in compliance with
     Subsection 4.02(e).

          "Old MDI" The former Medical Diagnostics, Inc., a Delaware
     corporation, which has been merged into the Borrower pursuant to the
     Merger.

          "PBGC" - See Subsection 6.01(l).

          "Person" - An individual, corporation, partnership, joint venture,
     trust or unincorporated organization, or a government or any agency or
     political subdivision thereof.

          "Premises" - All locations now or hereafter owned, leased or operated
     by the Borrower or by any Subsidiary of the Borrower.

          "Prime Rate" - That rate of interest per annum announced by the Bank,
     from time to time, at its Principal Office, as being its prime rate, it
     being understood that such rate is merely a reference rate, not necessarily
     the lowest, which serves as the basis upon which effective rates of
     interest are calculated for obligations making reference thereto.

          "Principal Office" - The principal place of business of the Bank, now
     located at 270 Park Avenue, New York, NY.

          "Receivables" - All of the Borrower's present and future accounts,
     accounts receivable and notes, drafts, acceptances and other instruments
     representing or evidencing a right to payment for goods sold or for
     services rendered.

          "Reserve Rate" - The aggregate rate, expressed as a decimal, at which
     the Bank would be required to maintain reserves under Regulation D of the
     Board of Governors of the Federal Reserve System (or any successor or
     similar regulation relating to such reserve requirements) against
     Eurocurrency Liabilities, as well as any other reserve required of the Bank
     with respect to the LIBOR Loans.  The Adjusted LIBOR Rate shall be adjusted
     automatically on and as of the effective date of any change in the Reserve
     Rate.

          "Revolving Commitment Amount" - Subject to reduction as provided in
     Section 11.05, as determined at any date, that amount by which (x)
     $6,000,000 exceeds (y) the sum of (i) all then undrawn amounts of
     outstanding letters of credit issued by the Bank for the account of the
     Borrower or any Guaranteeing Subsidiary plus (ii) all amounts then drawn on
     any such letter of credit which at said date shall not have been reimbursed
     to the Bank by the Borrower or such Guaranteeing Subsidiary.

          "Revolving Expiration Date" August 31, 1998.

          "Revolving Loans" - Loans made by the Bank to the Borrower pursuant to
     Section 2.01.  Subject to the terms of this Agreement, Revolving Loans may
     be Floating Rate Loans or LIBOR Loans.

          "Revolving Note" - The $6,000,000 face amount promissory note of the
     Borrower in the form of Exhibit B attached hereto.

          "Subordinated Debt" - All Indebtedness hereafter incurred by the
     Borrower which is fully subordinated to the Loans pursuant to a
     subordination agreement in form and substance satisfactory to the Bank.

          "Subsidiary" - As to any Person, any corporation or other entity as to
     which such Person and/or any of its Subsidiaries, directly or indirectly,
     owns, or has the right to control or direct the voting of, fifty (50%)
     percent or more of the outstanding capital stock or other ownership
     interest having general voting power (under ordinary circumstances), and
     also any other corporation or other entity whose financial results may be
     consolidated with those of said Person under generally accepted accounting
     principles.  The term "Subsidiary" will in any event be deemed to include
     the Covenanted Subsidiaries.

          "Tangible Net Worth" - An amount equal to the total assets of any
     Person (excluding the total intangible assets of such Person) minus the
     total liabilities of such Person.  Total intangible assets shall be deemed
     to include, but shall not be limited to, the excess of cost over book value
     of acquired businesses accounted for by the purchase method, formulae,
     trademarks, trade names, patents, patent rights and deferred expenses
     (including, but not limited to, unamortized debt discount and expense,
     organizational expense and experimental and development expenses). 
     Further, Tangible Net Worth shall expressly exclude (1) any write-up in the
     book value of any asset resulting from a revaluation thereof after the date
     of this Agreement, (2) earnings or losses attributable to equity interests
     in Persons that are not Subsidiaries, unless actually received, (3) the
     effect of any changes in the method of accounting and (4) minority
     interests in any Subsidiaries which are not wholly-owned.

          "Term Loan" The Loan made by the Bank to the Borrower pursuant to
     Section 2.05.

          "Term Note" The $9,000,000 original principal amount promissory note
     of the Borrower in the form of Exhibit C attached hereto.

          Section 1.02.  Use of Defined Terms.  Any defined term used in the
                         --------------------
     plural preceded by the definite article shall be taken to encompass all
     members of the relevant class.  Any defined term used in the singular
     preceded by "any" shall be taken to indicate any number of the members of
     the relevant class.

          Section 1.03.  Accounting Terms.  All accounting terms not
                         ----------------
     specifically defined herein shall be construed in accordance with United
     States generally accepted accounting principles consistently applied on the
     basis used by the concerned entity (or its corporate predecessor) in prior
     years.

                                      ARTICLE II

                            AMOUNTS AND TERMS OF THE LOANS

          Section 2.01.  Revolving Loans.  Subject to the terms and conditions
                         ---------------
     hereinafter set forth, the Bank will make loans under this Section 2.01
     ("Revolving Loans") to the Borrower at the Principal Office of the Bank on
     any Business Day prior to the first to occur of (i) the Expiration Date or
     (ii) the earlier termination of the Commitment pursuant to Section 8.02 or
     the earlier termination of this Agreement under Section 11.05, in such
     amounts as the Borrower may request; provided, however, that the Aggregate
     Revolving Loans shall at no time exceed the then-effective Revolving
     Commitment Amount.  Within such Revolving Commitment Amount, and subject to
     the terms and conditions hereof, the Borrower may obtain Revolving Loans,
     repay Revolving Loans and obtain Revolving Loans again on one or more
     occasions.  Each request for a Revolving Loan shall be in a principal
     amount of $500,000 or an integral multiple of $100,000 in excess of
     $500,000.  The Revolving Loans shall be evidenced by the Revolving Note of
     the Borrower, dated as of the date hereof, payable to the order of the
     Bank.  The Borrower hereby irrevocably authorizes the Bank to make or cause
     to be made, on a schedule attached to the Revolving Note or on the books of
     the Bank, at or following the time of making each Revolving Loan and of
     receiving any payment of principal, an appropriate notation reflecting such
     transaction and the then aggregate unpaid principal balance of the
     Revolving Loans.  The unpaid principal amount, as so noted, will constitute
     presumptive evidence as to the amount owed by the Borrower with respect to
     principal of the Revolving Loans.  Failure of the Bank to make any such
     notation shall not, however, affect any obligation of the Borrower or right
     of the Bank hereunder or under the Revolving Note.

          Section 2.02.  Request for Floating Rate Revolving Loans.  Except as
                         -----------------------------------------
     otherwise provided below with respect to LIBOR Loans, the Borrower will
     give the Bank, prior to 12:00 Noon on the Business Day on which a Revolving
     Loan is to be made, written notice specifying the amount and date of each
     Revolving Loan requested.

          Section 2.03.  Repayment of Principal of Revolving Loans.  The
                         -----------------------------------------
     Borrower will repay in full all Revolving Loans and all interest accrued
     thereon to the date of payment upon the first to occur of:  (i) the
     Revolving Expiration Date or (ii) an acceleration under Subsection 8.02(a)
     following an Event of Default.  Except as provided below with respect to
     LIBOR Loans, the Borrower may prepay at any time, without premium or
     penalty, the whole or any portion of any Revolving Loan.  Each such
     prepayment, if less than the Aggregate Revolving Loans then outstanding,
     shall be in a principal amount of at least $100,000.

          Section 2.04.  Interest Payments on Revolving Loans.  The Borrower
                         ------------------------------------
     will pay interest on the principal amount of the Aggregate Revolving Loans
     outstanding from time to time, from the date of the initial Revolving Loan
     until payment of all Revolving Loans and the Revolving Note in full. 
     Interest on Floating Rate Revolving Loans will be payable monthly in
     arrears on the first day of each month (commencing with the first such date
     after the making of any Revolving Loan).  Interest on any LIBOR Rate
     Revolving Loan will be payable on the Interest Payment Date or Dates
     applicable thereto.  In any event, interest shall also be paid on the date
     of payment of the Revolving Loans in full.  Subject to Section 2.14 below,
     interest on Floating Rate Revolving Loans shall be paid at a fluctuating
     rate per annum which shall at all times be equal to the sum of (i) one-
     quarter of one (0.25%) percent per annum plus (ii) the Base Rate as in
     effect from time to time (but in no event in excess of the maximum rate
     permitted by then applicable law), with a change in such rate of interest
     to become effective on the same day on which any change in the Base Rate is
     effective.  The rate of interest payable on each LIBOR Rate Revolving Loan
     shall be the Adjusted LIBOR Rate applicable thereto.  Notwithstanding the
     foregoing, after the occurrence and during the continuance of any Event of
     Default, interest on all outstanding principal of the Revolving Loans (and,
     to the extent permitted by law, on any overdue interest on the Revolving
     Loans) shall be payable at a fluctuating rate per annum which at all times
     shall be equal to the sum of (i) two (2%) percent per annum plus (ii) the
     Base Rate as in effect from time to time (but in no event in excess of the
     maximum rate from time to time permitted by then applicable law),
     compounded monthly and payable on demand.

          Section 2.05.  Term Loan.  Pursuant to this Agreement, the Bank is
                         ---------
     this day making a term loan (the "Term Loan") to the Borrower in the
     original principal amount of $9,000,000.  The Term Loan is evidenced by the
     Term Note.  The Borrower hereby irrevocably authorizes the Bank to make or
     cause to be made, on a schedule attached to the Term Note or on the books
     of the Bank, at or following the time of receiving each payment or
     prepayment of principal of the Term Note, an appropriate notation
     reflecting such transaction and the then aggregate unpaid principal balance
     of the Term Loan.  Failure of the Bank to make any such notation shall not,
     however, affect any obligation of the Borrower hereunder or under the Term
     Note.  The aggregate unpaid principal amount of the Term Loan, as recorded
     by the Bank from time to time on such schedule or on such books, shall
     constitute presumptive evidence of such amount.

          Section 2.06.  Repayment of Principal of the Term Loan.  The Borrower
                         ---------------------------------------
     will repay the principal amount of the Term Loan in eighteen consecutive
     quarterly installments, each in the amount of $500,000, payable on the last
     day of each calendar quarter commencing March 31, 1996 and continuing on
     the last day of each calendar quarter thereafter through and including June
     30, 2000 when there shall be due and payable an amount equal to all then
     unpaid principal of the Term Loan and all accrued interest thereon.  Except
     as otherwise provided below with respect to so much of the Term Loan as is
     then represented by a LIBOR Loan, the Borrower may at its option prepay at
     any time, without premium or penalty, the whole or any portion of the Term
     Loan; provided that (i) each such optional prepayment, if less than the
     entire principal amount of the Term Loan then outstanding, shall be in an
     amount of $500,000 or an integral multiple thereof and (ii) each such
     prepayment shall be accompanied by payment of all interest on the Term Loan
     accrued to the date of such prepayment.  Any partial prepayment of
     principal of the Term Loan shall be applied to installments of principal of
     the Term Loan thereafter coming due in inverse order of normal maturity. 
     The Borrower shall give not less than 10 Business Days' prior written
     notice of any prepayment of the Term Loan.

          Section 2.07.  Interest Payments on Term Loan.  The Borrower will pay
                         ------------------------------
     interest on the principal amount of the Term Loan outstanding from time to
     time, from the date hereof until payment of the Term Loan and the Term Note
     in full.  Except as provided below with respect to all or any portion of
     the Term Loan which constitutes a LIBOR Loan, such interest will be payable
     monthly in arrears on the first day of each month (commencing with
     October 1, 1995) and on the date of payment in full of the Term Loan. 
     Interest on all or any portion of the Term Loan which constitutes a LIBOR
     Loan will be payable on the Interest Payment Date or Dates applicable
     thereto.  Except as provided below with respect to all or any portion of
     the Term Loan which constitutes a LIBOR Loan, the rate of interest on the
     Term Loan shall, subject to Section 2.14 below, be a fluctuating rate per
     annum which shall at all times be equal to the sum of (i) one-half of one
     (0.5%) percent per annum plus (ii) the Base Rate as in effect from time to
     time (but in no event in excess of the maximum rate permitted by then
     applicable law), with a change in such rate of interest to become effective
     on the same day on which any change in the Base Rate is effective.  The
     rate of interest payable on all or any portion of the Term Loan which
     constitutes a LIBOR Loan will be the Adjusted LIBOR Rate applicable
     thereto.  Notwithstanding the foregoing, after the occurrence and during
     the continuance of any Event of Default, interest on all outstanding
     principal of the Term Loan (and, to the extent permitted by law, on any
     overdue interest on the Term Loan) shall be payable at a fluctuating rate
     per annum which at all times shall be equal to the sum of (i) two (2%)
     percent per annum plus (ii) the Base Rate as in effect from time to time
     (but in no event in excess of the maximum rate permitted by then applicable
     law), compounded monthly and payable on demand.

          Section 2.08.  LIBOR Loans.  (a) Any Revolving Loan made under this
                         -----------
     Article II will, except as provided in this Section 2.08, be a Floating
     Rate Loan.  Subject to the conditions set forth in this Agreement, the
     Borrower may elect that any Revolving Loan to be made under Section 2.01
     will be made as a LIBOR Loan.  Such election shall be made by the Borrower
     giving to the Bank a written or facsimile notice (a "Fixed Rate Borrowing
     Notice") containing the information described below, which Fixed Rate
     Borrowing Notice must be received by the Bank not later than 12:00 noon
     (New York time) three Business Days prior to the date of the proposed
     borrowing.  Each Fixed Rate Borrowing Notice must state that a LIBOR Loan
     is being requested, specify the amount of the proposed LIBOR Loan requested
     and specify the duration of the Interest Period selected for such Revolving
     Loan.  Any Fixed Rate Borrowing Notice shall, upon receipt by the Bank,
     become irrevocable and binding on the Borrower.  If the Borrower shall
     submit a Fixed Rate Borrowing Notice and shall then fail for any reason to
     borrow the LIBOR Loan described therein, the Borrower shall, upon
     submission by the Bank of a Bank Certificate with respect thereto,
     forthwith indemnify the Bank against any loss or expense incurred by the
     Bank as a result of any such failure by the Borrower, including, without
     limitation, any loss or expense incurred by reason of the liquidation or
     redeployment of deposits or other funds acquired by the Bank to fund or
     maintain the requested LIBOR Rate Revolving Loan.  Each such LIBOR Rate
     Revolving Loan will mature and be due and payable in full on the last day
     of the Interest Period applicable thereto.  The principal amount of any
     such LIBOR Rate Revolving Loan so repaid may be reborrowed as a new LIBOR
     Rate Revolving Loan to the extent and on the terms and conditions contained
     in this Agreement by delivery to the Bank of a new Fixed Rate Borrowing
     Notice conforming to the requirements set forth above in this Section 2.08
     or, to the extent and on the terms and conditions contained in this
     Agreement, may be reborrowed as a Floating Rate Revolving Loan (and any
     LIBOR Rate Revolving Loan not so repaid and not so reborrowed as a new
     LIBOR Rate Revolving Loan will be deemed to have been so reborrowed as a
     Floating Rate Revolving Loan).

          (b)  In addition to the foregoing, the Borrower may elect that all or
     any portion of the Term Loan (provided that such portion is in the
     principal amount of $500,000 or an integral multiple of $100,000 in excess
     of $500,000) be converted to a LIBOR Loan.  Such election shall be made by
     the Borrower giving to the Bank a written or facsimile notice (a "Fixed
     Rate Conversion Notice") containing the information described below, which
     Fixed Rate Conversion Notice must be received by the Bank not later than
     12:00 noon (New York Time) three (3) Business Days prior to the date of the
     proposed conversion.  Each Fixed Rate Conversion Notice must state that a
     conversion to a LIBOR Loan is requested, specify the amount of the relevant
     LIBOR Loan and specify the duration of the Interest Period selected.  At
     the end of any Interest Period applicable to all or any portion of the Term
     Loan, the Term Loan (or such portion) shall become a Floating Rate Loan,
     subject to the Borrower's right to again convert same to a LIBOR Loan
     pursuant to the provisions of this Subsection 2.08(b).

          (c)  Any request for a LIBOR Rate Revolving Loan and any election to
     convert all or any portion of the Term Loan to a LIBOR Loan may be made on
     behalf of the Borrower only by a duly authorized officer; provided,
     however, that the Bank may conclusively rely upon any written or facsimile
     communication received from any individual whom the Bank believes in good
     faith to be such a duly authorized officer.

          Section 2.09.  Commitment Fees.  The Borrower will pay to the Bank on
                         ---------------
     the last day of each calendar quarter, commencing on September 30, 1995,
     and on the Revolving Expiration Date or the date of any earlier termination
     of the Commitment, commitment fees ("Commitment Fees") computed in arrears
     on the daily average unused portion of the Revolving Commitment Amount
     during the calendar quarter then ending.  Such Commitment Fees will be
     payable, based on such daily average unused portion of the Revolving
     Commitment Amount, at the rate of 0.375% per annum, appropriately prorated
     for any period of less than a calendar quarter.  As used herein, the
     "unused portion" of the Revolving Commitment Amount shall mean such unused
     portion of such Revolving Commitment Amount as results from the fact either
     that the Bank has not for any reason made Revolving Loans up to the
     Revolving Commitment Amount or from the fact that the Borrower has repaid
     Revolving Loans so as to increase the amount of such unused portion.  The
     Bank will endeavor to invoice the Borrower for the estimated quarterly
     Commitment Fees not less than 15 days prior to each due date.

          The closing fee provided for in the Affiliate Guaranty from Advanced
     NMR and the Commitment Fees provided for in this Section 2.09 are in
     addition to any fees, balances or charges which may be applicable to other
     services now or hereafter provided to the Borrower by the Bank or any of
     its affiliates.

          Section 2.10.  Rate Determination Protection.  In the event that:
                         -----------------------------

             (i)   the Bank shall determine that, by reason of circumstances
          affecting the London interbank market or otherwise, adequate and
          reasonable methods do not exist for ascertaining LIBOR for any
          Interest Period, or

            (ii)   the Bank shall determine that:

                    (A)  the making or continuation of any LIBOR Loan has been
               made impracticable or unlawful by (1) the occurrence of a
               contingency that materially and adversely effects the London
               interbank market or (2) compliance by the Bank in good faith with
               any applicable law or governmental regulation, guideline or order
               or interpretation or change thereof by any governmental authority
               charged with the interpretation or administration thereof or with
               any request or directive of any such governmental authority
               (whether or not having the force of law); or

                    (B)  LIBOR will not adequately and fairly reflect the cost
               to the Bank of funding its LIBOR Loans for such Interest Period

     then the Bank shall forthwith give notice of such determination (which
     shall be conclusive and binding on the Borrower) to the Borrower.  In such
     event the Borrower shall forthwith repay all outstanding LIBOR Loans and
     the obligation of the Bank to make LIBOR Loans shall be suspended until the
     Bank determines that the circumstances giving rise to such suspension no
     longer exist, whereupon the Bank shall notify the Borrower.

          Section 2.11.  Prepayment of LIBOR Loans.  The following provisions
                         -------------------------
     shall be effective as to any LIBOR Loan:  If, due to acceleration of the
     maturity of the Notes or due to optional prepayment or for any other
     reason, the Bank receives payment of any installment of principal of any
     LIBOR Loan on any date prior to the last day of the then-current Interest
     Period applicable thereto, the Borrower shall, upon demand and receipt of a
     Bank Certificate from the Bank with respect thereto, pay forthwith to the
     Bank any amounts required to compensate the Bank for any losses, costs or
     expenses which it may have incurred and may reasonably incur as a result of
     such payment, including, without limitation, any loss or expense incurred
     by reason of the liquidation or redeployment of funds acquired by the Bank
     to fund or maintain such LIBOR Loan.

          Section 2.12.  Increased Costs; Capital Adequacy.
                         ---------------------------------

          (a)  If the adoption or effectiveness, after the date hereof, of any
     applicable law, rule or regulation, or any change therein, or any change in
     the interpretation or administration thereof by any governmental authority,
     central bank or comparable agency charged with the interpretation or
     administration thereof, or compliance by the Bank with any request or
     directive (whether or not having the force of law) of any such authority,
     central bank or comparable agency:

             (i)   shall subject the Bank to any Imposition or other charge with
          respect to any LIBOR Loan or its obligation to make LIBOR Loans, or
          shall change the basis of taxation of payments to the Bank of the
          principal of or interest on any LIBOR Loan or any other amounts due
          under this Agreement in respect of any LIBOR Loan or the Bank's
          obligation to make LIBOR Loans (except for changes in the rate of
          taxation on the overall net income of the Bank imposed by the
          jurisdiction in which the Bank's Principal Office is located); or

            (ii)   shall impose, modify or deem applicable any reserve, special
          deposit, deposit insurance or similar requirement (including, without
          limitation, any such requirement imposed by the Board of Governors of
          the Federal Reserve System, but excluding any such requirement already
          included in the applicable Reserve Rate) against assets of, deposits
          with or for the account of, or credit extended by, the Bank or shall
          impose on the Bank or on the London interbank market any other
          condition affecting any LIBOR Loan or the Bank's obligation to make
          LIBOR Loans

     and the result of any of the foregoing is to increase the cost to the Bank
     of making or maintaining any LIBOR Loan, or to reduce the amount of any sum
     received or receivable by the Bank under this Agreement or under any Note
     with respect thereto, by an amount deemed by the Bank to be material, then,
     upon demand by the Bank and receipt of a Bank Certificate from the Bank
     with respect thereto, the Borrower shall pay forthwith to the Bank such
     additional amount or amounts as will compensate the Bank for such increased
     cost or reduction in receipts.

          (b)  If the Bank shall have determined that the adoption,
     effectiveness or phase-in after the date hereof of any applicable law, rule
     or regulation regarding capital requirements for banks or bank holding
     companies, or any change therein after the date hereof, or any change after
     the date hereof in the interpretation or administration thereof by any
     governmental authority, central bank or comparable agency charged with the
     interpretation or administration thereof, or compliance by the Bank with
     any request or directive of such entity regarding capital adequacy (whether
     or not having the force of law) has or would have the effect of reducing
     the return on the Bank's capital with respect to its Commitment or any
     Loans (whether in respect of Floating Rate Loans or LIBOR Loans) to a level
     below that which the Bank could have achieved (taking into consideration
     the Bank's policies with respect to capital adequacy immediately before
     such adoption, effectiveness, phase-in, change or compliance and assuming
     that the Bank's capital was then fully utilized) by any amount deemed by
     the Bank to be material:  (i) the Bank shall promptly after its
     determination of such occurrence give notice thereof to the Borrower; and
     (ii) the Borrower shall pay to the Bank as an additional fee from time to
     time on demand such amount as the Bank certifies to be the amount that will
     compensate it for such reduction.  A certificate of the Bank claiming
     compensation under this Section shall be conclusive in the absence of
     manifest error.  Such certificate shall set forth the nature of the
     occurrence giving rise to such compensation, the additional amount or
     amounts to be paid to it hereunder and the method by which such amounts
     were determined.  In determining such amount, the Bank may use any
     reasonable averaging and attribution methods.

          (c)  No failure on the part of the Bank to demand compensation on any
     one occasion shall constitute a waiver of its right to demand such
     compensation on any other occasion and no failure on the part of the Bank
     to deliver any Bank Certificate in a timely manner shall in any way reduce
     any obligation of the Borrower to the Bank under this Section 2.12.

          Section 2.13. Illegality or Impossibility.  Notwithstanding any other
                        ---------------------------
     provision of this Agreement, if the introduction of or any change in or in
     the interpretation or administration of any law or regulation applicable to
     the Bank or the Bank's activities in the London interbank market shall make
     it unlawful, or any central bank or other governmental authority having
     jurisdiction over the Bank or the Bank's activities in the London interbank
     market shall assert that it is unlawful, or otherwise make it impossible,
     for the Bank to perform its obligations hereunder to make LIBOR Loans or to
     continue to fund or maintain LIBOR Loans, then on notice thereof and demand
     therefor by the Bank to the Borrower, (i) the obligation of the Bank to
     fund LIBOR Loans shall terminate and (ii) the Borrower shall within five
     (5) Business Days after the Bank gives such notice prepay in full all
     affected LIBOR Loans.

          Section 2.14.  Rate Adjustment.  If for any Measurement Period (as
                         ---------------
     defined in Subsection 7.01(k) below) ending December 31, 1995, March 31,
     1996, June 30, 1996, September 30, 1996, December 31, 1996 or March 31,
     1997, the Borrower fails to achieve a Debt Service Coverage Ratio of at
     least 1.2 to 1 (the "Target Coverage Ratio"), the Borrower will pay to the
     Bank, as additional interest, an amount equal to the difference between (x)
     the interest which would have been payable on the Loans outstanding for
     such fiscal quarter at the Increased Rate (hereinafter defined) and (y) the
     interest actually paid on such outstanding Loans for such fiscal quarter. 
     Such additional interest will be paid within 45 days after the end of the
     fiscal quarter to which it relates (or, in the case of the fiscal quarter
     ending September 30, 1996, within 90 days after the end of such fiscal
     quarter or, in the case of all fiscal quarters, within such longer period
     as may be permitted by Subsections 7.03(b) and (c) with respect to the
     furnishing of financial statements).  If the Borrower fails to submit to
     the Bank timely quarterly financial statements complying with the
     provisions of Subsection 7.03(a) for any of the aforesaid fiscal quarters
     (or, in the case of the fiscal quarter ending September 30, 1996, timely
     consolidating financial statements complying with the provisions of
     Subsection 7.03(c) for the fiscal year then ending, containing separate
     information for said fiscal quarter ending September 30, 1996 in such
     detail as is reasonably satisfactory to the Bank), the Borrower will be
     deemed to have failed to achieve the Target Coverage Ratio for such fiscal
     quarter.  As used herein, (1) the Increased Rate for any Floating Rate
     Revolving Loan will be deemed to be a fluctuating rate per annum equal to
     the sum of (i) 0.65% per annum plus (ii) the Base Rate as in effect from
     time to time; (2) the Increased Rate for all or any portion of the Term
     Loan which constitutes a Floating Rate Loan will be deemed to be a
     fluctuating rate per annum equal to the sum of (i) 0.90% per annum plus
     (ii) the Base Rate in effect from time to time; and (3) the Increased Rate
     for any LIBOR Loan will be determined by applying the formula for "Adjusted
     LIBOR Rate" set forth in Section 1.01 above, except that for this purpose
     the LIBOR Rate Increment for the purposes of Revolving Loans will be deemed
     to be 2.9 and the LIBOR Rate Increment the purposes of the Term Loan will
     be deemed to be 3.4.

          Section 2.15.  Letters of Credit.  At the Borrower's request, the Bank
                         -----------------
     may, from time to time, in its sole discretion issue one or more letters of
     credit for the account of the Borrower or any Guaranteeing Subsidiary;
     provided that at the time of each such issuance and after giving effect
     thereto (x) the sum of (i) the Aggregate Revolving Loans, plus (ii) the
     stated amount of such letter of credit to be so issued, plus (iii) the
     undrawn amounts of all other letters of credit then outstanding issued by
     the Bank for the account of the Borrower or any Guaranteeing Subsidiary,
     plus (iv) all amounts then drawn on any such letter of credit which at that
     date shall not have been reimbursed to the Bank by the Borrower will in no
     event exceed (y) $6,000,000 (as such number may be reduced pursuant to
     Section 11.05).  Any such letter of credit will be issued for such fee and
     upon such terms and conditions as may be agreed to by the Bank and the
     Borrower at the time of issuance.  If any such letter of credit is issued
     for the account of a Guaranteeing Subsidiary, the Borrower will deliver to
     the Bank a guaranty of such Subsidiary's liability to the Bank, such
     Guaranty to be satisfactory in form and substance to the Bank.  The
     Borrower hereby authorizes the Bank, without further request from the
     Borrower, to cause the Borrower's liability to the Bank for reimbursement
     of funds drawn under any such letter of credit or in respect of any such
     guaranty to be repaid from the proceeds of a Revolving Loan to be made
     hereunder.  The Borrower hereby irrevocably requests that such Revolving
     Loans be made.

                                     ARTICLE III

                              LOAN PROCEEDS AND PAYMENTS

          Section 3.01.  Availability.  The proceeds of all Revolving Loans and
                         ------------
     the Term Loan shall be credited by the Bank to a general deposit account
     maintained by the Borrower with the Bank or otherwise as the Borrower may
     direct in writing.

          Section 3.02.  Payment Notices.  Without limitation of the Bank's
                         ---------------
     rights under Section 8.03 in case of an Event of Default, the Bank will
     endeavor to provide the Borrower with an appropriate invoice (which may be
     estimated) not less than 15 days prior to the due date of any payment of
     interest, principal and/or Commitment Fees under this Agreement and/or any
     Note.  The failure of the Bank to provide any such invoice shall not affect
     the obligation of the Borrower to pay when due interest, principal and all
     other sums as provided in this Agreement and/or in any Note.

          Section 3.03.  Use of Loan Proceeds.  The proceeds of the Revolving
                         --------------------
     Loans will be used solely for repayment of existing debt owed to Fleet Bank
     of Massachusetts, N.A., for amounts due and expenses incurred in
     conjunction with the Merger and for working capital purposes of the
     Borrower and its Affiliates.  The proceeds of the Term Loan will be used
     for the corporate purposes of the Borrower and its Affiliates.

          Section 3.04.  Payments.  Except as otherwise provided in Sections
                         --------
     3.02 and 8.03, all payments of interest, principal and any other sum
     payable hereunder and/or under any Note shall be made to the Bank at its
     Principal Office in immediately available funds.  All payments received by
     the Bank after 2:00 p.m. on any day shall be deemed received as of the next
     succeeding Business Day.  All monies received by the Bank hereunder shall
     be applied first to fees, charges, costs and expenses payable to the Bank
     under this Agreement, next to interest then accrued on account of the Loans
     and only thereafter to principal of the Loans (except that if no Event of
     Default has occurred and is continuing, the Borrower may designate that
     monies be applied in a different order; provided that in any event any
     partial prepayments of principal of the Term Loan will be applied to
     principal payments thereafter coming due in inverse order of normal
     maturity).  All interest and fees payable under this Agreement and/or any
     Note shall be computed on the basis of a year of 360 days for the number of
     days actually elapsed.

          Section 3.05.  Payment on Non-Business Days.  Whenever any payment to
                         ----------------------------
     be made hereunder or under any of the Notes shall be stated to be due on a
     day which is not a Business Day, such payment may be made on the next
     succeeding Business Day, and interest payable on each such date shall
     include the amount thereof which shall accrue during the period of such
     extension of time.

          Section 3.06.  Net Payments.  All payments by the Borrower hereunder
                         ------------
     and/or in respect of any Note shall be made without deduction, set-off or
     counterclaim, notwithstanding any claim which the Borrower may now or at
     any time hereafter have against the Bank.

                                      ARTICLE IV

                                CONDITIONS OF LENDING

          Section 4.01.  Conditions Precedent to Initial Loan.  Prior to the
                         ------------------------------------
     initial Loan hereunder, the Borrower shall deliver to the Bank duly
     executed copies of this Agreement and the Notes, and shall also deliver to
     the Bank the documents enumerated below in this Section 4.01, all of which,
     as well as all legal matters incident to the transactions contemplated
     hereby, shall be reasonably satisfactory in form and substance to the Bank
     and its counsel:

          (a)  Certified copies of the resolutions of the Board of Directors
     (and, if necessary, the stockholders) of the Borrower evidencing approval
     of this Agreement, the Notes and the other matters contemplated hereby and
     thereby and certified copies of all documents evidencing other necessary
     corporate action or approvals, if any, with respect to this Agreement, the
     Notes and such other matters, including, without limitation, any required
     approvals of governmental authorities and other Persons.

          (b)  A certificate, signed by the Secretary of the Borrower, setting
     forth the names and titles of the officers of the Borrower authorized to
     sign this Agreement, the Notes and any and all other agreements,
     certificates, notices and reports referred to herein; such certificate
     shall contain the true signatures of such officers and shall state that the
     Bank may conclusively rely on the statements made therein until the Bank
     shall receive a further certificate of such Secretary cancelling or
     amending the prior certificate and submitting signatures of the officers
     named in such further certificate.

          (c)  A copy of the Charter of the Borrower and all amendments thereto
     certified by the Secretary of State of Delaware; a copy of the by-laws of
     the Borrower, as amended to date, as certified by its Secretary; a
     certificate of legal existence and good standing (including franchise tax
     good standing) for the Borrower in Delaware; and certificates of the
     appropriate state officials and agencies in Massachusetts and in all other
     jurisdictions in which the Borrower owns, leases or operates any real or
     personal property and in each other jurisdiction in which the Borrower is
     required to qualify to do business, in each case attesting as to the
     Borrower's qualification and good standing (including tax good standing) in
     each such jurisdiction.

          (d)  A favorable written opinion of counsel to the Borrower and each
     Guarantor, in form and substance satisfactory to the Bank.

          (e)  An Affiliate Guaranty, executed by each Guarantor.

          (f)  Certified copies of the resolutions of the respective Board of
     Directors (and, if necessary, the stockholders) of each Guarantor
     evidencing approval of its respective Affiliate Guaranty and the other
     matters contemplated hereby and thereby and certified copies of all
     documents evidencing other necessary corporate action or approvals, if any,
     with respect to such Affiliate Guaranty and such other matters, including,
     without limitation, any required approvals of governmental authorities and
     other Persons.

          (g)  A certificate, signed by the Clerk or Secretary of each
     Guarantor, setting forth the names and titles of the officers of such
     Guarantor authorized to sign its respective Affiliate Guaranty and any
     certificates, notices and reports referred to herein or therein; such
     certificate shall contain the true signatures of such officers and shall
     state that the Bank may conclusively rely on the statements made therein
     until the Bank shall receive a further certificate of such Clerk or
     Secretary cancelling or amending the prior certificate and submitting
     signatures of the officers named in such further certificate.

          (h)  A copy of the Charter of each Guarantor and all amendments  
     thereto, certified by the secretary of state of such Guarantor's
     jurisdiction of incorporation; a copy of the by-laws of each Guarantor, as
     amended to date, as certified by its Clerk or Secretary; certificates of
     legal existence and good standing (including tax good standing) for each
     Guarantor in its jurisdiction of incorporation, and certificates of
     qualification and good standing for each Guarantor from the appropriate
     state officials and agencies in all other jurisdictions where such
     Guarantor owns, leases or operates any real or personal property and in
     each other jurisdiction in which such Guarantor is required to qualify to
     do business, in each case attesting as to such Guarantor's qualification
     and good standing (including tax good standing) in each such jurisdiction.

          (i)  A pledge by Advanced NMR of the stock of AMS owned by Advanced
     NMR (other than shares of AMS held in escrow; provided, however, that
     shares of AMS released from escrow shall become subject to the pledge);
     pledges by the Borrower of the stock of each of the Covenanted Subsidiaries
     other than Western Massachusetts Magnetic Resonance Services, Inc., Mobile
     MRI of Western Massachusetts, Inc. and Greater Springfield MRI, Inc.; and
     pledges by the Borrower and/or the relevant Subsidiaries of the partnership
     interests owned by the Borrower and/or any such Subsidiary in each of
     Greater Boston MRI Limited Partnership and MVA Rehabilitation Associates. 
     Stock pledges will be accompanied by the relevant stock certificates and
     appropriate stock powers endorsed in blank.  The Borrower and or any
     relevant Subsidiaries shall execute a pledge of the partnership interests
     owned by the Borrower or any such Subsidiaries in Merrimack Scanning
     Associates if Merrimack Scanning Associates does not wind up its businesses
     prior to March 31, 1996.

          (j)  Uniform Commercial Code Financing Statements and all such other
     documents as shall be necessary or desirable to vest in the Bank a first
     priority interest in and to all of the Collateral, and evidence of all
     filings, recordations (including, without limitation, recordations with the
     United States Patent and Trademark Office, the United States Copyright
     Office and the Massachusetts Department of Motor Vehicles, if necessary)
     and other actions necessary or desirable to perfect fully the Bank's
     security interests.

          (k)  Such documents which, in the opinion of the Bank, are required to
     be obtained in connection with the Loans by reason of the provisions of any
     law or regulation applicable to the Bank, and the statements made in such
     documents shall be such as, in the opinion of the Bank, will permit such
     Loans from the Bank in accordance with such laws and regulations.

          (l)  Financial statements of Advanced NMR as at December 31, 1994 and
     for the fiscal year then ended, certified by the independent certified
     public accountants of Advanced NMR, together with financial statements of
     Old MDI as at September 30, 1994 and for the fiscal year then ended,
     certified by the independent certified public accountants of Old MDI.

          (m)  Interim financial statements for each of Old MDI and Advanced NMR
     as at June 30, 1995, together with the opening balance sheets of the
     Borrower giving effect to the Merger, all of same to be satisfactory to the
     Bank in presentation and as to the financial results presented.

          (n)  Certificates of the insurance (including, without limitation,
     professional liability insurance) required by this Agreement and/or the
     Affiliate Guaranties.

          (o)  An Officer's Certificate dated the date of such initial Loan,
     affirming compliance with the conditions of Subsections 4.02(a)-(d).

          (p)  A certificate executed by the chief financial officer of the
     Borrower, dated the date of such initial Loan, demonstrating compliance
     with each of Subsections 7.01(m), 7.01(n), 7.01(p), 7.01(q) and 7.01(r).

          (q)  All such releases and terminations which may be necessary so that
     the Bank receives a first priority lien on all of the Collateral.

          (r)  Evidence reasonably satisfactory to the Bank that the Borrower,
     Advanced NMR and the other Guarantors are in compliance with all material
     federal, state and local laws, rules and regulations (including, without
     limitation, ERISA).

          (s)  Evidence of consummation of the Merger.

          (t)  Copies of all capitalized leases to which the Borrower, any
     Subsidiary of the Borrower or Advanced NMR is a party.

          (u)  Copies of all partnership agreements to which the Borrower or any
     of its Subsidiaries is a party.

          (v)  Copies of all employment and compensation agreements with
     executive officers to which the Borrower is a party.

          (w)  Evidence satisfactory to the Bank that the Borrower has obtained
     the rate protection required by Subsection 7.01(t).

          (x)  Such other documents, instruments, records, assignments,
     consents, certificates, opinions, assurances and authorizations as the Bank
     may shall reasonably require.

          Section 4.02.  Conditions Precedent to All Loans.  The obligation of
                         ---------------------------------
     the Bank to make any Loan (including the initial Loan) or to issue any
     letter of credit hereunder is subject to the further conditions precedent
     that on the date on which such Loan is made or such letter of credit is
     issued (and after giving effect thereto):

          (a)  The statements, representations and warranties of the Borrower
     made in this Agreement and the statements, representations and warranties
     of each Guarantor made in its respective Affiliate Guaranty shall continue
     to be correct in all material respects as of the date of such Loan or such
     letter of credit issuance, as the case may be.

          (b)  The covenants and agreements of the Borrower contained herein and
     the covenants and agreements of each Guarantor contained in its respective
     Affiliate Guaranty shall have been complied with in all material respects
     on and as of the date of such Loan or such letter of credit issuance, as
     the case may be.

          (c)  No Default or Event of Default shall have occurred and be
     continuing.

          (d)  No material adverse change shall have occurred in the financial
     condition of the Borrower or any Guarantor from that disclosed in the
     financial statements for such entity most recently furnished to the Bank.

          Each request for a Loan or for the issuance of any letter of credit
     and each acceptance by the Borrower of the proceeds of any Loan shall be
     deemed to constitute the representation of the Borrower that all of the
     foregoing conditions of this Section 4.02 are true and correct as of the
     date of such Loan or such letter of credit issuance, as the case may be.

                                      ARTICLE V

                                       SECURITY

          Section 5.01.  Grant of Security Interest.  As security for the
                         --------------------------
     repayment of the principal amount of the Loans and the interest thereon,
     and also for the prompt and full payment and performance of any and every
     other liability and obligation of the Borrower to the Bank, whether arising
     out of this Agreement or otherwise (including, without limitation, all
     reimbursement obligations with respect to any letters of credit issued
     hereunder), whether otherwise secured or unsecured, direct or indirect,
     absolute or contingent, primary or secondary, due or to become due, and all
     whether now or hereafter existing or arising (all of the foregoing being
     collectively referred to as the "Obligations"), the Borrower does hereby
     pledge, grant, assign and transfer to the Bank, and grant to the Bank a
     security interest in and to, all of the following property of the Borrower,
     all whether now owned or existing or hereafter acquired or arising:

          (a)  all equipment, fixtures, furnishings, furniture, motor vehicles
     and machinery of the Borrower (but excepting (i) any personal automobiles,
     (ii) all items of computer equipment leased at the date hereof from Fleet
     Bank of Massachusetts, N.A. and listed on Exhibit D hereto and (iii) those
     items of equipment which are described on Exhibit D hereto), wherever
     located, whether now owned or hereafter acquired, whether affixed or
     moveable, and all replacements of, substitutions for and accessions to any
     of same and all products and proceeds (including, without limitation,
     insurance proceeds) of any of the foregoing;

          (b)  all Receivables of the Borrower;

          (c)  all contract rights of the Borrower, including, without
     limitation, licenses, employment agreements, any non-competition agreements
     for the benefit of the Borrower, and all leases and occupancy agreements;
     all obligations owing to the Borrower of every kind and nature; and all tax
     refunds of every kind and nature, including, without limitation, loss
     carryback refunds; and all of the foregoing whether now existing or
     hereafter acquired or arising;

          (d)  all of the Borrower's Inventory;

          (e)  all of the Borrower's general intangibles, choses in action,
     chattel paper, insurance policies, deposits, deposit accounts, money, cash,
     documents and instruments (whether negotiable or non-negotiable and
     regardless of attachment to chattel paper), whether arising out of,
     relating to or evidencing all or any of the foregoing Collateral or
     otherwise, and all whether now existing or hereafter acquired or arising;

          (f)  all goodwill, trade secrets, formulae, customer lists, trade
     names, trademarks, copyrights, patents and licenses (including, without
     limitation, the trademarks, copyrights, patents and licenses listed on
     Exhibit E hereto) and all files, records (including, without limitation, 
     computer programs, tapes and related electronic data processing software)
     and writings, whether now owned or hereafter acquired; and

          (g)  all liens, guaranties, securities, rights, remedies and
     privileges pertaining to, and all products and proceeds (including, without
     limitation, insurance proceeds) of, and all accessions to, any of the
     foregoing.

          Section 5.02.  Pledges; Further Grants of Security.  The pledges
                         -----------------------------------
     described in Subsection 4.01(i) are being delivered this date to the Bank
     by the Borrower and the Guaranteeing Subsidiaries as further security for
     the Obligations.  The Borrower represents that at the date hereof, due to
     various contractual relationships with unrelated third parties, (i) the
     Borrower is not able to pledge to the Bank the stock of Western
     Massachusetts Magnetic Resonance Services, Inc. ("WMMRSI"), (ii) WMMRSI is
     not able to pledge to the Bank its partnership interests in Greater
     Springfield MRI Limited Partnership ("GSMRI"), (iii) the Borrower is not
     able to pledge to the Bank its partnership interests in Mass. Mobile
     Imaging Venture ("MMIV"), (iv) the Borrower is not able to cause MMIV to
     grant a security interest in its assets to the Bank, (v) the Borrower is
     not able to cause GSMRI to grant a security interest in its assets to the
     Bank, (vi) the Borrower is not able to cause MVA Rehabilitation Associates
     to grant a security interest in its assets to the Bank, (vii) the Borrower
     is not able to cause Merrimack Scanning Associates to grant a security
     interest in its assets to the Bank, [(viii) Greater Springfield MRI, Inc.
     is not able to grant a security interest in its assets (including, without
     limitation, its partnership interest in Mobile MRI of Western Massachusetts
     Associates) to the Bank, (ix) Mobile MRI of Western Mass., Inc. is not able
     to grant a security interest in its assets (including, without limitation,
     its partnership interest in Mobile MRI of Western Massachusetts Associates)
     to the Bank and (x) the Borrower is not able to cause Mobile MRI of Western
     Massachusetts Associates to grant a security interest in its assets to the
     Bank].  The Borrower contemplates that in the future some or all of the
     foregoing restrictions may lapse.  Promptly (and in any event within 30
     days) after any such restriction lapses, the Borrower will execute and
     deliver pledges to the Bank (or cause each relevant Subsidiary entity to
     pledge and/or grant a security to the Bank) so that to the maximum extent
     legally permissible at any time the Bank will hold a fully perfected pledge
     of and security interest in all assets of the Borrower and each such
     Subsidiary entity.

          The Borrower is presently not able to grant to the Bank a security
     interest in those items of equipment which are listed on Exhibit D hereto,
     due to prohibitions on junior liens contained in the financing arrangements
     for said units in effect at the date hereof.  If the presently existing
     financing for any such items of equipment is paid or prepaid and the
     Borrower retains any such items of equipment, the Borrower will grant to
     the Bank (and will deliver to Bank all documentation necessary to provide)
     a fully perfected first priority security interest in each such item.

                                      ARTICLE VI

                            REPRESENTATIONS AND WARRANTIES

          Section 6.01.  Representations and Warranties.  As an inducement to
                         ------------------------------
     the Bank to execute this Agreement and to make Loans hereunder to the
     Borrower and/or issue letters of credit for the account of the Borrower,
     the Borrower hereby represents and warrants to the Bank as follows:

          (a)  The Borrower is a corporation duly organized, validly existing
     and in good standing under the laws of Delaware and has the corporate power
     and authority to enter into and perform this Agreement, to execute and
     deliver the Notes, to grant the security interests described in Article V,
     to enter into and perform all obligations required of the Borrower by all
     other instruments and other documents referred to herein to which it is a
     party, to fulfill its obligations set forth herein and therein and to carry
     out the transactions contemplated hereby and thereby.  The Borrower has all
     requisite corporate power to own and operate its properties and to carry on
     its business as now conducted and as proposed to be conducted and is duly
     qualified to do business and in good standing in Massachusetts and in each
     other jurisdiction where the Borrower owns, leases or operates any real or
     personal property and in each other jurisdiction where the failure so to be
     qualified could (singly or in the aggregate with all such other failures to
     be qualified) have a Material Adverse Effect.  At the date of this
     Agreement, except as set forth on Exhibit F hereto, the Borrower has no
     Subsidiaries and is not a member of any partnership or joint venture.  The
     names and respective jurisdictions of incorporation of all of the
     Borrower's Subsidiaries and the respective stock ownership (or ownership of
     partnership interests, as the case may be) in each of them is set forth on
     Exhibit F hereto, together with a description of each such partnership and
     joint venture.

          (b)  All of the issued and outstanding shares of capital stock of the
     Borrower are being acquired at this date, of record and beneficially, by
     Advanced NMR.  There are no outstanding rights, options, warrants,
     conversion rights or agreements or commitments of any kind relating to the
     aforesaid shares or to the authorized and unissued or treasury stock of the
     Borrower.

          (c)  The execution, delivery and performance of this Agreement, the
     Notes and the other documents required to be executed by the Borrower
     pursuant hereto have been duly authorized by all necessary corporate
     action, will not require the consent of any third party, and will not
     conflict with, violate the provisions of, or cause a default or constitute
     an event which, with the passage of time or the giving of notice or both,
     could constitute a default on the part of the Borrower under any contract,
     agreement, law, rule, order, ordinance, franchise, instrument or other
     document or under any provision of the Charter or by-laws of the Borrower,
     or result in the imposition of any lien or encumbrance on any property or
     assets of the Borrower, other than in favor of the Bank.  This Agreement
     and the other documents delivered to the Bank by the Borrower pursuant
     hereto (including, without limitation, the Notes) are the legal, valid and
     binding obligations of the Borrower, enforceable in accordance with their
     respective terms, in each case except as such enforceability may be limited
     by: (i) the effect of bankruptcy, insolvency, reorganization, moratorium or
     other similar laws affecting the rights and remedies of creditors generally
     or (ii) the effect of general principles of equity, whether enforcement is
     considered in a proceeding in equity or at law.

          (d)  Except as disclosed on Exhibit G hereto, there are no actions,
     suits, proceedings or investigations pending or, to the knowledge of the
     Borrower, threatened (nor, to the knowledge of the Borrower, is there any
     basis therefor) against or affecting the Borrower or any of its
     Subsidiaries by or before any court or governmental department, commission,
     board, bureau, agency or instrumentality, domestic or foreign, which could
     prevent or hinder the consummation of the transactions contemplated hereby
     or call into question the validity of this Agreement, any Note or any other
     instrument provided for or contemplated by this Agreement or any action
     taken or to be taken in connection with the transactions contemplated
     hereby or thereby, nor are there any such actions, suits, proceedings or
     investigations pending or, to the knowledge of the Borrower, threatened,
     anticipated or contemplated which, if determined adversely to the Borrower
     or any of its Subsidiaries, in any single case or in the aggregate, could
     have a Material Adverse Effect.

          (e)  Except as otherwise disclosed on Exhibit H hereto, neither the
     Borrower nor any of its Subsidiaries is in violation of any term of its
     Charter or by-laws, as now in effect, nor in violation of any term of any
     mortgage, indenture, judgment, decree or order, any other instrument,
     contract or agreement or of any term of any administrative determination,
     failure to comply with which, singly or in the aggregate with all such
     other failures, could have a Material Adverse Effect.

          (f)  The Borrower and each of its Subsidiaries has filed proper and
     accurate federal, foreign, state and local tax returns, reports and
     estimates for all years and periods for which any such returns, reports or
     estimates were required to be filed and has paid all taxes, assessments,
     impositions, fees and other governmental charges required to be paid in
     respect of the periods covered by any such returns, reports or estimates,
     other than any such taxes, assessments, impositions, fees and charges which
     the Borrower is contesting in good faith by appropriate proceedings which
     serve as a matter of law to stay the enforcement of any remedy of the
     relevant taxing authority and as to which adequate reserves have been
     established.  Neither the Borrower nor any of its Subsidiaries is
     delinquent in the payment of any tax, assessment or governmental charge,
     and no deficiencies for any tax, assessment or governmental charge have
     been asserted or assessed, and the Borrower knows of no material
     governmental liability or basis therefor for which adequate reserves have
     not been established.

          (g)  The Borrower and each of its Subsidiaries is in compliance with
     all requirements of law, federal, state and local, and all requirements of
     all governmental bodies or agencies having jurisdiction over any such
     Person, the conduct of its business, the use of its properties and assets
     and all Premises occupied by it, failure to comply with which could, singly
     or in the aggregate with all other such failures, have a Material Adverse
     Effect.  Without limiting the foregoing, the Borrower and each of its
     Subsidiaries has all the required franchises, licenses, permits,
     certificates and authorizations needed for the conduct of its business and
     the use of its properties and all premises occupied by it, as now
     conducted, owned and used or as proposed to be conducted, owned and used,
     including, without limitation, all of the determinations of need and
     "physician notices of intent" needed for the operation of the MRI units
     currently operated by the Borrower or any such Subsidiary (all such
     Determinations of Need and physician notices of intent being listed on
     Exhibit I hereto); provided that no representation is made herein as to any
     such franchise, license, permit, certificate or authorization if the
     failure to have same could not, singly or in the aggregate with all other
     such failures, have a Material Adverse Effect.  Neither the Borrower nor
     any such Subsidiary has received any notice not heretofore complied with
     from any federal, state or local authority or any insurance or inspection
     body that any of its properties, facilities, equipment or business
     procedures or practices fails to comply in any material respect with any
     applicable law, ordinance, regulation, building or zoning law or any other
     requirement of any such authority or body.  No authorization, consent,
     approval, license, exemption of or filing or registration with any court or
     governmental department, commission, board, bureau, agency or
     instrumentality, domestic or foreign, is or will be necessary to the valid
     execution or delivery of, or for the performance by the Borrower of any of
     its obligations under, this Agreement, any Note or any other instrument
     provided for or contemplated by this Agreement.

          (h)  Neither the Borrower nor any of its Subsidiaries is engaged in
     the business of extending credit for the purpose of purchasing or carrying
     margin stock (within the meaning of Regulation U of the Board of Governors
     of the Federal Reserve System), and no part of the proceeds of any Loan
     will be used to purchase or carry any margin stock or to extend credit to
     others for the purpose of purchasing or carrying any margin stock or in any
     other manner which would involve a violation of any of the regulations of
     the Board of Governors of the Federal Reserve System.  The Borrower and
     each of its Subsidiaries is primarily engaged in the business of the
     management, ownership, operation, lease and sale of medical equipment and
     mobile medical equipment; the provision of management services within the
     healthcare industry including, but not limited to, business advisory
     services, billing and collection services, scheduling, transcription,
     legal, finance, personal consulting, personnel consulting and placement
     services; and the ownership and operation of medical service businesses. 
     The Borrower is not an "investment company" nor the "affiliate" of an
     "investment company", as such terms are defined in the Investment Company
     Act of 1940.

          (i)  The Borrower and each Subsidiary of the Borrower has good and
     marketable title to all assets now carried on its books, including those
     reflected in its financial statements referred to in Subsection 6.01(j) or
     acquired since the date of such statements, free of any mortgages, pledges,
     charges, liens, security interests or other encumbrances, except as
     permitted under Subsection 7.02(b).  The Borrower and each Subsidiary of
     the Borrower enjoys peaceful and undisturbed possession under all material
     leases under which it is operating, and all of such leases are valid and
     subsisting and in full force and effect.

          (j)  The financial statements of Old MDI for its fiscal year ended
     September 30, 1994 and for the fiscal quarters ended December 31, 1994,
     March 31, 1995 and June 30, 1995, each heretofore delivered to the Bank,
     fairly present the consolidated financial condition of Old MDI as at the
     dates thereof and for the periods covered thereby, subject, as to interim
     statements, to normal year-end audit adjustment (which is not expected to
     be material) and to the absence of footnotes.  Said financial statements
     have been prepared in accordance with generally accepted accounting
     principles consistently applied throughout the relevant periods, subject,
     as to interim statements, to normal year-end audit adjustment (which is not
     expected to be material) and to the absence of footnotes.  The pro forma
                                                                    --- -----
     opening balance sheet giving effect to the Merger, heretofore delivered to
     the Bank, fairly presents the pro forma financial condition of the Borrower
                                   --- -----
     at the date hereof.  Neither the Borrower nor any of its Subsidiaries has
     any liability, contingent or otherwise, not disclosed in the aforesaid
     financial statements or in any notes thereto that could materially
     adversely affect the financial condition of the Borrower.  The following
     representations are true at the date hereof and shall be true at the date
     of each Loan, in each case since the date of the most recently delivered
     financial statements:  (i) except as otherwise previously disclosed to the
     Bank in writing, there has been no material adverse change in the business,
     assets or condition, financial or otherwise, of the Borrower or of any of
     its Subsidiaries or of any Guarantor; (ii) except as otherwise previously
     disclosed to the Bank in writing, neither the business, condition or
     operations of the Borrower or of any of its Subsidiaries or of any
     Guarantor nor any of their respective properties or assets have been
     materially adversely affected as the result of any legislative or
     regulatory change, any revocation or change in any franchise, license or
     right to do business, or any other event or occurrence, whether or not
     insured against; (iii) except as otherwise previously disclosed in writing
     to the Bank, neither the Borrower nor any of its Subsidiaries nor any
     Guarantor has experienced any material controversy or problem with its
     employees or with any labor organization; and (iv) except as otherwise
     previously disclosed in writing to the Bank (including disclosure as to the
     Merger), neither the Borrower nor any of its Subsidiaries nor any Guarantor
     has entered into any material transaction other than in the ordinary course
     of its business.

          (k)  The Borrower and each of its Subsidiaries owns or has a valid
     right to use all of the patents, licenses, copyrights, trademarks, service
     marks, trade names and franchises ("Intellectual Property") now being used
     or necessary to conduct its business, all of which are described on
     Exhibit D hereto (including, in each case, the owner of such Intellectual
     Property).  None of the Intellectual Property owned by the Borrower or any
     Subsidiary of the Borrower is represented by a registered patent,
     copyright, trademark or other federal or state registration, except as set
     forth on Exhibit E hereto.  The conduct of the respective businesses of the
     Borrower and its Subsidiaries, as now operated, does not conflict with
     valid patents, licenses, copyrights, trademarks, service marks, trade names
     or franchises of others in any manner that could have a Material Adverse
     Effect.

          (l)  No employee pension benefit plan maintained by the Borrower or
     any Subsidiary of the Borrower or in which employees of the Borrower or any
     Subsidiary of the Borrower participate has any accumulated funding
     deficiency within the meaning of the Employee Retirement Income Security
     Act of 1974, as amended ("ERISA"), nor does the Borrower or any Subsidiary
     of the Borrower have any material liability to the Pension Benefit Guaranty
     Corporation ("PBGC") established under ERISA (or any successor thereto) in
     connection with any employee pension benefit plan (or other class of
     benefit which the PBGC has elected to insure), and there have been no
     "reportable events"  or "prohibited transactions" with respect to any such
     plan, as those terms are defined in Section 4043 of ERISA and Section 4975
     of the Internal Revenue Code of 1986, as amended, respectively.  Except as
     listed on Exhibit J hereto, neither the Borrower nor any Subsidiary of the
     Borrower maintains any profit-sharing, retirement, deferred compensation,
     ESOT, stock bonus, stock option or similar benefit plan for any officers or
     employees.  Said Exhibit J also sets forth all employment agreements,
     management contracts and other written agreements with any managers and/or
     executive officers to which the Borrower or any Subsidiary of the Borrower
     is a party.

          (m)  The chief executive offices and principal place of business of
     the Borrower are located at 6 New England Executive Park, Burlington, MA 
     01803.  The Borrower conducts business under no trade name other than its
     corporate name and "MDI."

          (n)  All offices, warehouses, sales offices and other business
     locations maintained at the date hereof by the Borrower or any of its
     Subsidiaries are listed on Exhibit K hereto.  The Borrower and its
     Subsidiaries maintain books and records relating to Receivables and other
     intangible Collateral only at the Borrower's chief executive offices
     described in Subsection 6.01(m) above.  At the date hereof, the Borrower
     and each Subsidiary of the Borrower maintains Inventory, machinery and/or
     equipment only at the locations shown on Exhibit K hereto.  As to any items
     of the Collateral which are or are to become fixtures, the premises
     described on Exhibit K constitute the real estate concerned.  Said
     Exhibit K discloses the record owners of each such premises.  Said Exhibit
     K also describes all titled motor vehicles owned by the Borrower and/or any
     Guaranteeing Subsidiary and the jurisdiction in which each such vehicle is
     titled and principally located, as well as the principal locations of all
     other mobile goods.

          (o)  To the best knowledge of the Borrower, none of the executive
     officers of the Borrower or of any Subsidiary of the Borrower is subject to
     any agreement in favor of anyone other than the Borrower or such Subsidiary
     which limits or restricts that person's right to engage in the type of
     business activity conducted or proposed to be conducted by the Borrower or
     such Subsidiary or to use therein any property or confidential information
     or which grants to anyone other than the Borrower or such Subsidiary any
     rights in any inventions or other ideas susceptible to legal protection
     developed or conceived by any such officer.

          (p)  Neither the Borrower nor any Subsidiary of the Borrower is now a
     party to any contract or agreement, the terms of which now have or, as far
     as can be reasonably foreseen, may have a Material Adverse Effect.

          (q)  Neither this Agreement, nor the financial statements referred to
     herein, nor any Officer's Certificate delivered pursuant to this Agreement,
     nor any other agreement, document, certificate or written statement
     furnished to the Bank by or on behalf of the Borrower or any Guarantor in
     connection with the transactions contemplated by this Agreement contains
     any untrue statement of a material fact or omits to state a material fact
     necessary in order to make the statements contained herein or therein not
     misleading.  There is no fact within the special knowledge of any of the
     executive officers of the Borrower which has not been disclosed herein or
     in writing by them to the Bank and which materially adversely affects, or
     in the future in their opinion may, insofar as they can now foresee,
     materially adversely affect the business, properties, assets or condition,
     financial or other, of the Borrower or any Guarantor.

          (r)  The Merger has been duly consummated in accordance with the
     Merger Agreement dated May 2, 1995 (a copy of which has heretofore been
     provided by the Borrower to the Bank) and in compliance with all applicable
     laws.

          (s)  After giving effect to the Merger and the transactions
     contemplated thereby and to the extension of financial accommodations
     contemplated by this Agreement, the Borrower (A) is and will be able to pay
     its debts as they become due, (B) has and will have funds and capital
     sufficient to carry on its business as now conducted or as contemplated to
     be conducted, (C) owns property having a value both at fair valuation and
     at present fair saleable value greater than the amount required to pay its
     debts as they become due, and (D) is not insolvent and will not be rendered
     insolvent as determined by applicable law.

                                     ARTICLE VII

                              COVENANTS OF THE BORROWER

          Section 7.01.  Affirmative Covenants Other Than Reporting
                         ------------------------------------------
     Requirements.  Without limiting any other covenants and provisions hereof,
     ------------
     the Borrower covenants and agrees that so long as the Commitment is in
     effect or any Loan is outstanding or any letter of credit issued hereunder
     is outstanding or any other Obligation of the Borrower to the Bank remains
     unpaid:

          (a)  The Borrower will pay the principal of and interest on the Notes
     at the times and place and in the manner provided for in the Notes and
     herein, and will promptly pay when due any and all other amounts owing to
     the Bank, in respect of fees or otherwise.

          (b)  The Borrower will pay and discharge (and will cause each of the
     Covenanted Subsidiaries to pay and discharge) all taxes, assessments and
     governmental charges or levies imposed upon it or them, or upon its or
     their income or profits, or upon any properties belonging to it or them,
     prior to the date on which penalties or interest would attach thereto, and
     all lawful claims which, if unpaid, might become a lien or charge upon any
     properties of the Borrower or any of the Covenanted Subsidiaries; provided
     that neither the Borrower nor any such Covenanted Subsidiary shall be
     required to pay any such tax, assessment, charge, levy or claim which is
     being contested in good faith and by proper proceedings which serve as a
     matter of law to stay the enforcement of any remedy of the taxing authority
     or claimant and as to which the Borrower or the Covenanted Subsidiary
     concerned, as the case may be, shall have set aside on its books adequate
     reserves (or, if such enforcement is not so stayed as a matter of law, a
     surety bond, satisfactory to the Bank as to amount, terms and the identity
     of the surety, shall have been delivered to the Bank).  The Borrower will
     pay (and will cause each of the Covenanted Subsidiaries to pay) in a timely
     manner, all material lease obligations, trade debt and purchase money
     obligations, other than any such lease obligations, trade debt and purchase
     money obligations which the Borrower or the relevant Covenanted Subsidiary
     (as the case may be) is contesting in good faith, with adequate reserves
     having been established, under circumstances in which no material asset or
     interest of the Borrower or such Covenanted Subsidiary would be
     jeopardized.  The Borrower will fully, faithfully and punctually perform
     and fulfill (and will cause each of the Covenanted Subsidiaries fully,
     faithfully and punctually to perform and fulfill) all material covenants
     and agreements under any leases of real estate, agreements relating to
     purchase money debt, equipment leases and other material contracts, other
     than any such covenants and agreements which the Borrower or the relevant
     Covenanted Subsidiary (as the case may be) is contesting in good faith,
     with adequate reserves having been established, under circumstances in
     which no material asset or interest of the Borrower or such Covenanted
     Subsidiary would be jeopardized.

          (c)  The Borrower will maintain (and will cause each of the Covenanted
     Subsidiaries to maintain), with responsible and reputable insurance
     companies or associations reasonably satisfactory to the Bank, insurance in
     such amounts and covering such risks as are typically insured by similar
     businesses (and any such other insurance as the Bank may reasonably request
     from time to time), but in any event in amounts sufficient to prevent the
     Borrower or any such Covenanted Subsidiary from becoming a coinsurer. 
     Without limiting the foregoing, the Borrower will keep the Collateral fully
     insured against fire, lightning and extended coverage perils and against
     such other risks as the Bank may from time to time reasonably require, in
     an amount at least equal to the full insurable value of the Collateral and
     in any event not less than the amount necessary to avoid co-insurance. 
     Insurance at any one location may be "blanket" with insurance at other
     locations and insurance of the Borrower and the Covenanted Subsidiaries may
     be "blanket" with insurance of other Affiliates of the Borrower.  In
     addition, the Borrower shall procure and maintain general liability
     insurance with minimum limits of not less than $5,000,000.  The Borrower
     shall also procure and maintain workmen's compensation insurance, employer
     liability and other insurance as required by law.  The Borrower will also
     maintain comprehensive automobile liability insurance covering all motor
     vehicles owned or leased by it, with combined limits of not less than
     $1,000,000 for bodily injury and $500,000 for property damage.  The
     Borrower will also maintain (and will cause each of the Covenanted
     Subsidiaries to maintain) (i) business interruption insurance in amounts
     satisfactory to the Bank covering all material business operations of the
     Borrower and each such Covenanted Subsidiary and (ii) professional
     malpractice insurance covering all employees of the Borrower or any such
     Covenanted Subsidiary engaged in patient care.  All insurance herein
     provided for shall be in such form and written by such companies as may
     from time to time be reasonably approved by the Bank.  The Borrower will
     assign and deliver to the Bank duplicate original copies or certificates
     for all policies of casualty insurance, as collateral and further security
     for the obligations of the Borrower herein contained, with the Bank named
     as first loss payee with respect to all property in which it holds a
     security interest (except that the Bank may be named as second loss payee
     with respect to any property as to which the Bank holds a security interest
     subject to another Person's prior security interest which is permitted
     under this Agreement).  All policies of insurance shall contain a provision
     forbidding cancellation of such insurance either by the carrier or by the
     insured until at least 30 days after written notice of the proposed
     cancellation is given to the Bank; and whenever any insurance is to expire
     for any reason, the Borrower will deliver to the Bank, at least 30 days
     prior to such expiration, a renewal or replacement policy, complying with
     all of the conditions of this Subsection.  In addition, the Borrower will
     obtain an endorsement with respect to all such policies indicating that,
     solely as to the Bank, the insurance shall not be impaired or invalidated
     by reason of any act or neglect of the named insured or any subsequent
     owner of any of the property insured.  Any insurance proceeds received by
     the Bank may, at the option of the Bank, either (i) be applied to the
     payment or prepayment of any obligations of the Borrower to the Bank or
     (ii) be transmitted in whole or in part to the owner of the property
     damaged or destroyed for the purpose of repairing or replacing the same;
     provided that insurance proceeds so received as proceeds of business
     interruption insurance or with respect to damage to or destruction of any
     equipment will (provided that no Event of Default has then occurred and is
     then continuing) be released to the Borrower.  Any insurance proceeds
     received by the Bank with respect to damage to or destruction of any
     equipment on which it holds a security interest that are released to the
     Borrower shall be used by the Borrower to repay any outstanding capital
     financing of such damaged or destroyed equipment and to repair or replace
     the damaged or destroyed equipment, with the Bank to receive its same
     priority security interest in the repaired and/or replacement equipment.

          (d)  The Borrower will preserve and maintain (and, subject to the last
     sentence of this Subsection, will cause each of the Covenanted Subsidiaries
     to preserve and maintain) its corporate existence, rights, franchises and
     privileges and remain in good standing in the jurisdiction of its
     incorporation.  The Borrower will remain qualified and in good standing in
     Massachusetts and will qualify and remain qualified (and will cause each of
     the Covenanted Subsidiaries to qualify and remain qualified and in good
     standing) in each other jurisdiction in which it maintains a plant,
     warehouse or office and in each other jurisdiction in which the failure so
     to qualify could have a Material Adverse Effect.  Notwithstanding the
     foregoing, the Borrower may wind up the business of any Covenanted
     Subsidiary in the ordinary course of the Borrower's business and, in
     connection with such winding up, may merge such Covenanted Subsidiary into
     the Borrower or may dissolve any such Covenanted Subsidiary and transfer
     the assets of such Covenanted Subsidiary pro rata to its stockholders (or
                                              --- ----
     its partners, in the case of any Covenanted Subsidiary which is a
     partnership).

          (e)  The Borrower will comply (and will cause each of the Covenanted
     Subsidiaries to comply) with the requirements of all applicable laws
     (including, without limitation, laws relating to environmental protection),
     rules, regulations and the orders of any court or other tribunal or
     governmental or administrative authority or agency applicable to it or to
     its business, property or assets, all to the extent that failure to comply
     with any such laws, rules, regulations or orders could, singly or in the
     aggregate with all other such failures, have a Material Adverse Effect. 
     The Borrower will obtain and maintain (and will cause each of its
     Subsidiaries to obtain and maintain) all licenses, permits and permissions
     relating to its properties or business, failure to obtain or maintain which
     could, singly or in the aggregate with all other such failures, have a
     Material Adverse Effect.  Without limitation of the foregoing, the Borrower
     will maintain in effect (and will cause to be maintained in effect) all
     determinations of need and "physician notices of intent" necessary or
     desirable in connection with MRI units owned and/or operated by the
     Borrower or by any Covenanted Subsidiary.

          (f)  At any reasonable time and from time to time (and at any time and
     as frequently as the Bank requests following the occurrence and during the
     continuance of an Event of Default), the Borrower will permit (and will
     cause each of the Covenanted Subsidiaries to permit) the Bank, and any
     agents or representatives thereof, to inspect and examine Collateral,
     wherever located, and to examine and make copies of and take abstracts from
     the records and books of account of, and visit the properties of the
     Borrower and each of the Covenanted Subsidiaries, and to discuss the
     affairs, finances and accounts of the Borrower and any such Covenanted
     Subsidiary with any of their respective managers, officers or directors and
     independent accountants, all of whom are hereby authorized and directed to
     cooperate with the Bank in carrying out the intent of this Subsection
     7.01(f).  The Borrower will, upon request, arrange for the Bank to have
     access to (and facilities for obtaining copies of) all electronically
     stored data and all papers and files of any kind relating to Receivables of
     the Borrower or any Covenanted Subsidiary.

          (g)  The Borrower will keep proper and complete records and books of
     account in which complete entries will be made in accordance with generally
     accepted accounting principles consistently applied reflecting all
     financial transactions of the Borrower and its Subsidiaries.  All financial
     statements submitted to the Bank under this Agreement will be prepared in
     accordance with generally accepted accounting principles consistently
     applied, except that interim statements will be subject to normal year-end
     audit adjustment (not to be material) and to the absence of footnotes.

          (h)  The Borrower will maintain and preserve (and will cause each of
     the Covenanted Subsidiaries to maintain and preserve) all of their
     respective properties necessary or useful in the proper conduct of their
     respective businesses in good working order and condition (subject to
     ordinary wear and tear), making all necessary repairs thereto and
     replacements thereof; provided that neither the Borrower nor any Covenanted
     Subsidiary will be deemed to be in default under this Subsection 7.01(h) by
     reason of any damage by fire or other casualty so long as the Borrower (or
     such Covenanted Subsidiary, as the case may be) repairs and/or replaces the
     damaged property as promptly as reasonably practicable.

          (i)  The Borrower will maintain experienced and competent professional
     senior management with respect to its business and properties and with
     respect to the Covenanted Subsidiaries.  Without limitation of the
     foregoing, if any of John Lynch, David Gaynor and/or Steven James shall for
     any reason cease to serve as an executive officer of the Borrower actively
     involved in the Borrower's management, he shall be replaced, as promptly as
     reasonably practicable, as such executive officer by another individual of
     comparable experience and ability reasonably acceptable to the Bank; and
     this covenant shall become applicable to each such replacement officer.

          (j)  Subject to the provisions of the next following sentence, the
     Borrower will continue to conduct (and will cause each of the Covenanted
     Subsidiaries to continue to conduct) in the ordinary course, the business
     in which each of them is presently engaged.  Notwithstanding the
     immediately preceding sentence, the Borrower may wind up the business of
     any Covenanted Subsidiary in the ordinary course of the Borrower's
     business; provided that, upon such winding up, the assets of such
     Covenanted Subsidiary are transferred pro rata to the stockholders (or the
                                           --- ----
     partners, in the case of any Covenanted Subsidiary which is a partnership)
     of the relevant Covenanted Subsidiary.  Neither the Borrower nor any of
     such Covenanted Subsidiaries will, without the prior written consent of the
     Bank, directly or indirectly enter into any lines of business, businesses
     or ventures outside of the lines of business conducted by Old MDI
     immediately prior to the date hereof.

          (k)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange
     Commission.]  

          (l)  [This paragraph contains confidential information which has 
     been omitted, but filed separately with the Securities and Exchange
     Commission.]

          (m)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange
     Commission.]

          (n)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange 
     Commission.]

          (o)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange
     Commission.]

          (p)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange
     Commission.]

          (q)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange
     Commission.]

          (r)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange 
     Commission.]

          (s)  If the Borrower forms or acquires any Subsidiary after the date
     hereof, the Borrower will cause such Subsidiary to execute and deliver an
     Affiliate Guaranty (and, to the extent relevant, appropriate pledge
     agreements), to grant to the Bank a fully perfected first security interest
     in all of its assets (except for those assets encumbered by purchase money
     Indebtedness and capital lease financing within the limitations set forth
     in Section 7.02(a)(iv) hereof) and to observe and perform all of the
     agreements and obligations contained herein and therein.

          (t)  The Borrower will maintain at all times after the date of this
     Agreement through the first anniversary of such date an interest cap or
     rate swap or other interest rate protection satisfactory to the Bank
     relating to not less than 40% of the outstanding principal amount of the
     Term Loan; and the Borrower will maintain at all times after the first
     anniversary of the date of this Agreement through the second such
     anniversary an interest cap or rate swap or other interest rate protection
     satisfactory to the Bank relating to not less than 25% of the outstanding
     principal amount of the Term Loan.

          (u)  Within 60 days after the date hereof, the Borrower will establish
     with the Bank, and will thereafter maintain with the Bank, the principal
     operating and deposit accounts of the Borrower and the Covenanted
     Subsidiaries.

          Section 7.02.  Negative Covenants.  Without limiting any other
                         ------------------
     covenants and provisions hereof, the Borrower covenants and agrees that, so
     long as the Commitment is in effect or any Loan is outstanding or any
     letter of credit issued hereunder is outstanding or any other Obligation of
     the Borrower to the Bank has not been fully performed:

          (a)  The Borrower will not create, incur, assume or suffer to exist
     (nor permit any of the Covenanted Subsidiaries to create, incur, assume or
     suffer to exist) any Indebtedness, except for:

             (i)   Indebtedness owed to the Bank, including, without limitation,
          the Indebtedness represented by the Notes;

            (ii)   Indebtedness of the Borrower or any such Covenanted
          Subsidiary for taxes, assessments and governmental charges or levies,
          to the extent payment thereof shall not at the time be required under
          Subsection 7.01(b) above;

           (iii)   unsecured current liabilities of the Borrower or any such
          Covenanted Subsidiary (other than for money borrowed or for the
          deferred purchase price of property) incurred upon customary terms in
          the ordinary course of business and unsecured advances or progress
          payments under contracts incurred on customary terms in the ordinary
          course of business;

            (iv)   purchase money Indebtedness and capital lease financing owed
          to vendors or lessors of equipment used in the business of the
          Borrower or any of the Covenanted Subsidiaries, such purchase money
          Indebtedness and capital lease financing not to exceed the CapEx Limit
          (as defined in Subsection 7.02(t) hereof) in aggregate principal
          amount incurred per fiscal year of the Borrower;

             (v)   Subordinated Debt (including, without limitation, seller
          financing of any future Acquisition) hereafter incurred by the
          Borrower; but only if the Bank has given its prior written consent to
          the financial terms and the subordination provisions of such
          Subordinated Debt;

            (vi)   [This paragraph contains confidential information which has
           been omitted, but filed separately with the Securities and Exchange
           Commission.];

           (vii)   other Indebtedness existing at the date hereof, but only to
          the extent set forth on Exhibit L hereto; and

          (viii)   and guaranties expressly permitted pursuant to Subsection
          7.02(c) below.

          In the event the Borrower creates, incurs, assumes or suffers to exist
     any Indebtedness pursuant to Subsection 7.02(a)(iv) above, the Bank agrees
     upon request of the Borrower to execute a partial release of its security
     interest to the extent necessary to permit such indebtedness.

          (b)  The Borrower will not create, incur, assume or suffer to exist
     (nor permit any of the Covenanted Subsidiaries to create, incur, assume or
     suffer to exist) any mortgage, deed of trust, pledge, lien, security
     interest or other charge or encumbrance (including the lien or retained
     security title of a conditional vendor) of any nature (collectively,
     "liens"), upon or with respect to any of its property or assets, now owned
     or hereafter acquired, except that the foregoing restrictions shall not
     apply to:

               (i)  liens for taxes, assessments or governmental charges
          or levies on property of the Borrower or any of the Covenanted
          Subsidiaries if the same shall not at the time be delinquent or
          thereafter can be paid without interest or penalty or are being
          contested in good faith and by appropriate proceedings which serve as
          a matter of law to stay the enforcement of any remedies of the taxing
          authorities and as to which adequate reserves have been made (or, if
          such enforcement is not stayed as a matter of law, a surety bond
          satisfactory to the Bank as to amount, terms and the identity of the
          surety has been delivered to the Bank);

              (ii)  liens imposed by law, such as carriers', warehousemen's and
          mechanics' liens and other similar liens arising in the ordinary
          course of business for sums not yet due or which are being contested
          in good faith and by appropriate proceedings which serve as a matter
          of law to stay the enforcement thereof and as to which adequate
          reserves have been made (or, if such enforcement is not stayed as a
          matter of law, a surety bond satisfactory to the Bank as to amount,
          terms and the identity of the surety has been delivered to the Bank);

             (iii)  pledges or deposits under workmen's compensation laws,
          unemployment insurance, social security, retirement benefits or
          similar legislation;

              (iv)  liens existing on the date hereof to the extent listed on
          Exhibit L hereto; 

               (v)  liens securing the performance of bids, tenders, contracts
          (other than for the repayment of borrowed money), statutory
          obligations and surety bonds arising in the ordinary course of
          business;

              (vi)  zoning restrictions, easements and rights or restrictions of
          record on the use of real property which do not materially detract
          from its value or impair its use;

             (vii)  capital leases and liens securing the purchase price of
          property (to the extent such capital leases and purchases are
          permitted by clause (iv) of Subsection 7.02(a) above), provided that
                                                                 --------
          each such lien is given solely to secure the purchase price of such
          property, does not extend to any other property and is given at the
          time of the acquisition of such property; and

            (viii)  liens in favor of the Bank.

          (c)  The Borrower will not assume, guarantee, endorse or otherwise
     become directly or contingently liable (nor permit any of its Covenanted
     Subsidiaries to assume, guarantee, endorse or otherwise become directly or
     contingently liable), including, without limitation, liable by way of
     agreement, contingent or otherwise, to purchase, to provide funds for
     payment, to supply funds to or otherwise invest in any debtor or otherwise
     to assure any creditor against loss, in connection with any Indebtedness of
     any other Person, except (i) guaranties by endorsement for deposit or
     collection in the ordinary course of business, (ii) any guaranty in favor
     of the Bank, (iii) existing guaranties described on Exhibit M hereto,
     including existing liability incurred by the Borrower or any Covenanted
     Subsidiary by virtue of being the general partner of any partnership, (iv)
     any guaranty given by the Borrower with respect to any purchase money
     Indebtedness or capital lease financing hereafter incurred by any
     Covenanted Subsidiary, so long as the incurrence of such purchase money
     Indebtedness or capital lease financing is expressly permitted pursuant to
     clause (iv) of Subsection 7.02(a), and (v) any further liabilities arising
     after the date hereof for which the Borrower or any such Covenanted
     Subsidiary becomes liable by virtue of being the general partner of any
     partnership, so long as the incurrence of each such liability would have
     been permitted under any of clauses (i), (ii), (iii), (iv) or (v) of
     Subsection 7.02(a) if the Borrower or the Covenanted Subsidiary in question
     had incurred such liability directly (rather than merely becoming liable in
     its capacity as a general partner of the partnership which has incurred
     such liability).

          (d)  Except as otherwise provided in the second sentence of this
     Subsection, the Borrower will not liquidate or dissolve, or merge or
     consolidate with any other Person, or sell, assign, lease or otherwise
     dispose of (whether in one transaction or in a series of transactions) any
     item or items material to its business (whether now owned or hereafter
     acquired) included in the assets of the Borrower (nor will the Borrower
     permit any of the Covenanted Subsidiaries to do any of the foregoing),
     except that the Borrower and the Covenanted Subsidiaries may sell or
     dispose of property through (i) sales of Inventory in the ordinary course
     of business, (ii) disposal of worn out or obsolete equipment in the
     ordinary course of business, (iii) sale or disposal in any one fiscal year
     of items aggregating not more than five (5%) percent of the consolidated
     Tangible Net Worth of the Borrower measured as at the beginning of such
     year, and (iv) the winding up of the business of any Covenanted Subsidiary
     in the ordinary course of the Borrower's business under the circumstances
     provided for in Subsection 7.01(j) above.  Notwithstanding the foregoing,
     (i) any Subsidiary of the Borrower may be merged into the Borrower provided
     that no Event of Default has occurred and is then continuing and (ii) any
     such Subsidiary may be merged into any other Subsidiary of the Borrower. 
     Neither the Borrower nor any of the Covenanted Subsidiaries will make any
     Acquisition without the prior written consent of the Bank.

          (e)  The Borrower will not sell, assign, factor or dispose in any way
     of any of its Receivables or other rights to payment, with or without
     recourse, except for assignment for collection in the ordinary course of
     business, nor will the Borrower permit any of the Covenanted Subsidiaries
     to do any of the foregoing.

          (f)  The Borrower will not make or maintain, nor permit any of the
     Covenanted Subsidiaries to make or maintain, any loan or advance to any
     Person, or purchase or otherwise acquire, or permit any of its Subsidiaries
     to purchase or otherwise acquire, the capital stock, assets comprising the
     business of, or obligations of, or any interest in, any Person, except the
     following investments by the Borrower or any such Covenanted Subsidiary:
     
             (i)   [This paragraph contains confidential information which
          has been omitted, but filed separately with the Securities and
          Exchange Commission.];

            (ii)   investments consistent with the Borrower's Investment Policy
          Guidelines attached hereto as Exhibit N (except that the minimum
          capital base for acceptable commercial banks will be deemed increased
          for this purpose from $750,000,000 to $1,000,000,000);

           (iii)   travel advances and similar advances to employees in the
          ordinary course of the Borrower's business;

            (iv)   existing investments by the Borrower and/or any Covenanted
          Subsidiary in, and loans and advances by the Borrower to, any
          Subsidiary or joint venture to the extent disclosed on Exhibit O
          hereto; and

             (v)   future investments by the Borrower and/or any Covenanted
          Subsidiary in any entity which satisfies all of the following
          criteria:  (1) such entity is or becomes a Covenanted Subsidiary, (2)
          such entity is or becomes party to the Affiliate Guaranty of even date
          herewith from the Guaranteeing Subsidiaries to the Bank, and (3) such
          entity grants (or has granted and thereupon confirms) to the Bank a
          fully perfected first priority security interest in all of its assets
          (except for those assets encumbered by purchase money Indebtedness and
          capital lease financing within the limitations set forth in Section
          7.02(a)(iv) hereof).

          Nothing contained in this Subsection 7.02(f) shall permit the Borrower
     to use, directly or indirectly, proceeds of any Loan for the purpose,
     whether immediate, incidental or ultimate, of purchasing or carrying any
     "margin stock" within the meaning of Regulation U.  As used herein,
     "Relevant Fiscal Period" means (i) the six-month period ending
     September 30, 1995, (ii) the nine-month period ending December 31, 1995,
     (iii) the twelve-month period ending March 31, 1996, and (iv) the twelve-
     month period ending at each fiscal quarter-end thereafter.

          (g)  The Borrower will not establish (nor permit any of its
     Subsidiaries to establish) any new pension or defined benefit plan or
     modify any such existing plan for employees subject to ERISA, which plan
     provides any benefits based on past service, without the advance consent of
     the Bank to the amount of the aggregate past service liability thereby
     created.

          (h)  The Borrower will not waive (nor permit any of the Covenanted
     Subsidiaries to waive) any debt or claim, except in the ordinary course of
     its business.

          (i)  The Borrower will not make, directly or indirectly, any optional
     or voluntary prepayment or purchase of Subordinated Debt, nor make any
     payment of any Subordinated Debt except to the extent expressly permitted
     in the Subordination Agreement relating thereto.  The Borrower will not at
     any time make any payment on account of principal of and/or interest on any
     Subordinated Debt unless at the time of such payment (and after giving
     effect to any such payment of principal and/or interest) no Default nor any
     Event of Default shall have occurred and be continuing.

          (j)  The Borrower will not remove (nor permit to be removed) from the
     Premises listed on Exhibit K any books or records relating to Receivables
     or other intangible Collateral of the Borrower nor remove therefrom any
     tangible Collateral (other than Inventory sold to customers in the ordinary
     course of the Borrower's business and other than mobile goods, which may
     travel to other locations on a temporary basis but will not be removed from
     the state described in Exhibit K as the principal location thereof without
     prior written notice to the Bank), until after receipt of a certificate
     from the Bank, signed by an officer thereof, stating that the Bank has, to
     its satisfaction, obtained all documentation that it deems necessary or
     desirable to obtain, maintain, perfect and confirm the first priority
     security interests granted or intended to be granted herein.

          (k)  The Borrower will not move its chief executive offices or
     principal place of business from the address described in
     Subsection 6.01(m) nor change its name or identity nor use any trade name
     or trade style other than its corporate name nor make or suffer to be made
     any change in its corporate structure until, in each case, after receipt of
     a certificate from the Bank, signed by an officer thereof, stating that the
     Bank has, to its satisfaction, obtained all documentation that it deems
     necessary or desirable to obtain, maintain, perfect and confirm the first
     priority security interests granted or intended to be granted herein.

          (l)  The Borrower will not, without the prior written consent of the
     Bank, declare or pay any dividends, purchase, redeem, retire, or otherwise
     acquire for value any of its capital stock (or rights, options or warrants
     to purchase such shares) now or hereafter outstanding, return any capital
     to its stockholders or make any distribution of assets to its stockholders;
     provided that (i) at the date hereof, in connection with the Merger, the
     Borrower may dividend to Advanced NMR an amount not in excess of
     $12,000,000 and (ii) the Borrower may pay a dividend to Advanced NMR in an
     aggregate amount not to exceed $100,000 per fiscal year of the Borrower so
     long as at the time of any such dividend payment and after giving effect
     thereto no Default or Event of Default shall have occurred and be
     continuing and (iii) the Borrower may make payments to Advanced NMR in
     accordance with the terms of that certain Tax Sharing Agreement dated
     August 31, 1995 by and between Advanced NMR and the Borrower.

          (m)  Neither the Borrower nor any of the Covenanted Subsidiaries will
     become a member of any partnership or joint venture in which another entity
     has the ability to incur any Indebtedness on behalf of the Borrower or such
     Covenanted Subsidiary or to commit any assets of the Borrower or such
     Covenanted Subsidiary without the consent of the Borrower or such
     Covenanted Subsidiary, as the case may be.

          (n)  The Borrower will not enter into (nor permit any of the
     Covenanted Subsidiaries to enter into) any transaction, including, without
     limitation, the purchase, sale or exchange of any property or the rendering
     of any service, with any present or former Affiliate, except in the
     ordinary course of business and pursuant to the reasonable requirements of
     its business and upon fair and reasonable terms no less favorable to the
     Borrower or such Covenanted Subsidiary, as the case may be, than would be
     obtained in a comparable arms'-length transaction with any Person not an
     Affiliate.  As used herein, "Affiliate" of any entity means any officer or
     director of such entity or any Person which, directly or indirectly,
     through one or more intermediaries, controls or is controlled by or is
     under common control with such entity, or any Person which beneficially
     owns or holds five (5%) percent or more of any class of equity securities
     of such entity.  The term "control" means the possession, directly or
     indirectly, of the power to direct or cause the direction of the management
     and policies of any Person, whether through the ownership of voting
     securities, by contract or otherwise.  Without limitation of the foregoing,
     the "Affiliates" of the Borrower include Advanced NMR and each Subsidiary
     of Advanced NMR.

          (o)  The Borrower will not dispose of (nor permit any of its
     Subsidiaries to dispose of) any hazardous material or oil on any Premises
     of the Borrower or any such Subsidiary; nor shall the Borrower store or
     suffer or permit to exist on any Premises of the Borrower or any such
     Subsidiary any hazardous material or oil, nor transport or arrange the
     transport of (nor permit any such Subsidiary to transport or arrangement
     the transport of) any hazardous material or oil, except under valid permits
     and licenses and otherwise in compliance with all applicable laws and
     regulations.  The Borrower shall provide the Bank with prompt written
     notice of (i) any release or threat of release of any hazardous material or
     oil at or from any site or vessel owned, occupied or operated by the
     Borrower or any such Subsidiary and (ii) any incurrence of any expense or
     loss by any governmental authority in connection with the assessment,
     containment or removal of any hazardous material or oil for which expense
     or loss the Borrower or any such Subsidiary may be liable.  As used herein,
     the terms "hazardous material" and "oil" have the respective meanings
     ascribed to such terms in Mass. Gen. Laws, Ch. 21E and shall also be deemed
     to include any similar terms in any comparable statute in any other
     relevant jurisdiction.

          (p)  The Borrower will not suffer or permit to exist any circumstance
     in which the Borrower is not a wholly-owned Subsidiary of Advanced NMR or
     in which the percentage equity ownership of the Borrower in any entity
     which is a Subsidiary of the Borrower at the date hereof decreases from
     that shown on Exhibit F hereto.

          (q)  Neither the Borrower nor any of the Covenanted Subsidiaries will
     make any material change in the nature of its business as carried on the
     date hereof.  The Borrower will not change its fiscal year or accounting
     principles or methods of applying same (it being contemplated that Advanced
     NMR will change its fiscal year to a year ending September 30).  If any
     accounting treatment or classification is for any reason changed as to the
     accounts of the Borrower and/or any of its Subsidiaries, the Borrower will
     forthwith notify the Bank of same in writing and will execute and deliver
     any amendment to this Agreement which the Bank may reasonably deem
     necessary or desirable in order to preserve unimpaired the rights of the
     Bank and the obligations of the Borrower under this Agreement.

          (r)  The Borrower will not write up (by creating an appraisal surplus
     or otherwise), nor permit any of its Subsidiaries to write up, the value of
     any assets of the Borrower or such Subsidiary above their cost to the
     Borrower or such Subsidiary, as the case may be, less the depreciation
     regularly allowable thereon.

          (s)  The Borrower will not enter into (nor permit any Subsidiary of
     the Borrower to enter into) any new or replacement operating leases, except
     that Borrower may enter into (i) replacement leases for the items of
     equipment listed on Exhibit D hereto and (ii) three new operating leases,
     provided that each time the Borrower is able to demonstrate to the Bank
     that the equipment leased under a new operating lease pursuant to this
     Subsection 7.02(s)(ii) is profitable based upon reports compiled by the
     Borrower (profitability to be calculated consistently with historical
     reports of such information), the Borrower shall be permitted to enter into
     one additional new operating lease.

          (t)  [This paragraph contains confidential information which has 
     been omitted, but filed separately with the Securities and Exchange
     Commission.]

          Section 7.03.  Reporting Requirements.  So long as any Loan shall
                         ----------------------
     be outstanding or any letter of credit issued hereunder is outstanding or
     any other Obligation of the Borrower to the Bank shall remain unpaid or the
     Commitment is in effect, the Borrower shall furnish to the Bank:

          (a)  As soon as available and in any event within 45 days after the
     end of each of the first three fiscal quarters in each fiscal year of the
     Borrower, consolidated and consolidating balance sheets of the Borrower and
     Subsidiaries as at the end of such fiscal quarter and consolidated and
     consolidating statements of income and cash flow for the Borrower and
     Subsidiaries for such fiscal quarter and for the period commencing at the
     end of the previous fiscal year and ending with the end of such fiscal
     quarter, setting forth in each case in comparative form the corresponding
     figures for the corresponding period of the preceding fiscal year, all in
     reasonable detail and duly certified by the chief financial officer of the
     Borrower as having been prepared in accordance with generally accepted
     accounting principles consistently applied, subject to normal year-end
     audit adjustment and the absence of footnotes.

          (b)  As soon as available and in any event within 45 days after the
     end of each of the first three fiscal quarters in each fiscal year of
     Advanced NMR (or within such longer period, not to exceed in any event 50
     days after the end of the relevant fiscal quarter, as the Securities and
     Exchange Commission may allow for filing of Advanced NMR's Quarterly Report
     on Form 10-Q for the fiscal quarter in question), consolidated and
     consolidating balance sheets of Advanced NMR and Subsidiaries (including
     the Borrower) as at the end of such fiscal quarter and consolidated and
     consolidating statements of income and cash flow for Advanced NMR and
     Subsidiaries (including the Borrower) for such fiscal quarter and for the
     period commencing at the end of the previous fiscal year and ending with
     the end of such fiscal quarter, setting forth in each case in comparative
     form the corresponding figures for the corresponding period of the
     preceding fiscal year, all in reasonable detail and duly certified by the
     chief financial officer of Advanced NMR as having been prepared in
     accordance with generally accepted accounting principles consistently
     applied, subject to normal year-end audit adjustment and the absence of
     footnotes.

          (c)  As soon as available and in any event within 90 days after the
     end of each fiscal year of Advanced NMR (or within such longer period, not
     to exceed in any event 120 days after the end of the relevant fiscal year,
     as the Securities and Exchange Commission may allow for the filing of
     Advanced NMR's Annual Report on Form 10-K for the fiscal year in question),
     a copy of Advanced NMR's annual audit report for such fiscal year,
     including therein consolidated and consolidating balance sheets of Advanced
     NMR and Subsidiaries (including the Borrower) as at the end of such fiscal
     year and consolidated and consolidating statements of income and retained
     earnings and consolidated and consolidating statements of cash flow for
     Advanced NMR and Subsidiaries (including the Borrower) for such fiscal year
     (and including statements showing the results of Advanced NMR and the
     Borrower for the fourth quarter of such fiscal year of Advanced NMR).  The
     annual consolidated statements shall be certified by independent certified
     public accountants selected by Advanced NMR and reasonably acceptable to
     the Bank in such form as is generally recognized as "unqualified".  Each of
     the annual financial statements submitted under this Subsection shall be
     accompanied by a statement of the independent certified public accountants
     stating whether in the course of their examination (which shall include a
     review of this Agreement) they became aware of the existence as at the end
     of the fiscal year covered by such financial statements of any event,
     transaction, occurrence or state of affairs which would contravene or
     violate any of the covenants or agreements contained in this Agreement and,
     if their examination has disclosed any such event, transaction, occurrence
     or state of affairs, specifying the nature and period of the existence
     thereof.  Said accountants shall also state that they have examined the
     certificate of the chief financial officer submitted with the annual
     statements of the Borrower and referred to in Subsection 7.03(d) and that
     their examination has not disclosed the existence of anything contrary to
     the matters set forth in such certificate.  Such accountants' statement
     shall also include a schedule setting forth the computations necessary to
     determine compliance, as at the relevant fiscal year-end, with each of
     Subsections 7.01(k), 7.01(l), 7.01(m), 7.01(n), 7.01(o), 7.01(p), 7.01(q),
     7.01(r), 7.02(s) and 7.02(t).

          (d)  At the time of delivery of each annual statement of the Borrower
     and/or Advanced NMR and at the time of delivery of the quarterly statement
     for the first, second and third fiscal quarters of each fiscal year for the
     Borrower and/or Advanced NMR, a certificate executed by the chief financial
     officer of the Borrower stating that he has reviewed this Agreement and has
     no knowledge of any default by the Borrower or any of the Guarantors in the
     performance or observance of any of the provisions of this Agreement or, if
     he has such knowledge, specifying each such default and the nature thereof,
     which certificate shall be accompanied by a statement of such chief
     financial officer setting forth in detail the computations necessary to
     determine compliance with the covenants contained in Subsections 7.01(k),
     (l), (m), (n), (o), (p), (q) and (r).  In addition, the certificate
     delivered in connection with the annual statements will also set forth in
     detail the computations necessary to determine compliance with each of
     Subsection 7.02(s) and Subsection 7.02(t).

          (e)  Together with the quarterly financial statements described in
     Subsections 7.03(a) and 7.03(b) above, schedules of Inventory and
     Receivables (including agings) of the Borrower and Advanced NMR in such
     detail as shall be reasonably satisfactory to the Bank, such schedules to
     be certified as accurate by the chief financial officer of the Borrower or
     Advanced NMR, as the case may be.

          (f)  Prior to the end of each fiscal year of the Borrower and/or
     Advanced NMR, a forecast for the next following fiscal year for each of the
     Borrower and Advanced NMR, setting forth on a quarterly basis projections
     as to balance sheets, income statements and cash flow statements, all in
     such detail as will be reasonably satisfactory to the Bank.

          (g)  As soon as possible and in any event within five (5) Business
     Days after the occurrence of each Default or Event of Default, the
     statement of the Borrower setting forth details of such Default or Event of
     Default and the action which the Borrower proposes to take with respect
     thereto.

          (h)  As soon as possible and in any event within five (5) Business
     Days after the commencement thereof, notice of all actions, suits,
     proceedings and investigations by or before any court or governmental
     department, commission, board, bureau, agency or instrumentality, domestic
     or foreign, affecting the Borrower or any of its Subsidiaries or any
     Guarantor, excluding, however, any such action, suit, proceeding or
     investigation in which an adverse determination could not have a material
     adverse effect on the business, prospects or financial condition of the
     Borrower, any of its Subsidiaries or any Guarantor.

          (i)  Promptly after receipt, a copy of all audits or reports submitted
     to the Borrower by independent public accountants in connection with any
     annual, special or interim audits of the books of the Borrower and any
     letter of comments directed by such accountants to the management of the
     Borrower.

          (j)  As soon as possible and in any event within 30 days after the
     Borrower knows or has reason to know that any event has occurred which
     would constitute a reportable event under Section 4043(b) of Title IV of
     ERISA with respect to any employee pension or other benefit plan in which
     employees of the Borrower or of any Subsidiary of the Borrower participate,
     or that the PBGC or the Borrower or any Subsidiary of the Borrower has
     instituted or will institute proceedings under such Title to terminate such
     plan, a certificate of the chief financial officer of the Borrower setting
     forth details as to such termination or other reportable event and the
     action which the Borrower proposes to take with respect thereto, together
     with a copy of any notice of such reportable event which may be required to
     be filed with the PBGC, or any notice delivered by the PBGC evidencing its
     intent to institute such proceedings, or any notice to the PBGC that the
     plan is to be terminated, as the case may be.

          (k)  A copy of each registration statement and each periodic or
     current report filed by Advanced NMR with the Securities and Exchange
     Commission (the "SEC") or any successor agency (other than routine updating
     filings relating to employee benefit plans) and each annual report, proxy
     statement and other communication sent to shareholders or other
     securityholders generally, such copy to be provided to the Bank promptly
     upon such filing with the SEC or such communication with shareholders or
     securityholders, as the case may be.

          (l)  Promptly upon applying for, or being granted, a federal or state
     registration for any copyright, trademark or patent or purchasing any
     registered copyright, trademark or patent, written notice to the Bank
     describing same, together with all such documents as the Bank may prepare
     and reasonably request the Borrower to execute in order to give the Bank a
     fully perfected first priority security interest in each such copyright,
     trademark or patent.

          (m)  Promptly after the Borrower has knowledge thereof, written notice
     of:

            (i)     termination or potential termination of any consent,
          license, permit or franchise material to the conduct of the business
          of the Borrower or of any of its Subsidiaries or of any Guarantor or
          the ownership of its or their property and assets;

           (ii)     any material loss, damage or destruction to or of any
          property or assets of the Borrower or of any of its Subsidiaries or of
          any Guarantor (regardless of whether the same is covered by
          insurance);

          (iii)     any material controversy with employees of the Borrower or
          of any of its Subsidiaries or of any Guarantor or with any labor
          organization; and

           (iv)     any other material development adversely affecting the
          Borrower, any of its Subsidiaries or any Guarantor or their respective
          businesses, properties, assets or conditions, financial or otherwise.

          (n)  Promptly upon the occurrence of any change in any of the present
     executive officers or directors of the Borrower or of any of its
     Subsidiaries or of any Guarantor, all of whom are listed on Exhibit P
     hereto, a notice of such change.

          (o)  Such other information respecting the financial condition,
     operations, Inventory and Receivables of the Borrower and/or any of its
     Subsidiaries and/or any of the Guarantors as the Bank may from time to time
     reasonably request.

                                     ARTICLE VIII

                                 DEFAULT AND REMEDIES

          Section 8.01.  Events of Default.  The occurrence of any of the
                         -----------------
     following events shall constitute an Event of Default under this Agreement:

          (a)  The Borrower shall fail to make any payment of principal of any
     Note or any Loan on the date when due; or

          (b)  The Borrower shall fail to make any payment of interest on any
     Note or any Loan or in respect of any Commitment Fee on the date when due
     and such failure shall continue uncured for five (5) days after the date
     when due; or 

          (c)  Any representation or warranty of the Borrower contained herein
     shall at any time prove to have been incorrect in any material respect when
     made; or any representation or warranty made by the Borrower or any
     Guarantor in connection with the execution and delivery of this Agreement
     or in connection with any Loan shall at any time prove to have been
     incorrect in any material respect when made; or

          (d)  The Borrower shall default in the performance or observance of
     any agreement or obligation under any of Subsections 7.01(b)(first sentence
     only), (c), (d)(as applies to corporate existence only), (e), (k), (l),
     (m), (n), (o), (p), (q) or (r) or Section 7.02 or Section 7.03; or

          (e)  The Borrower shall default in the performance of any other term,
     covenant or agreement contained in this Agreement and such default shall
     continue unremedied for 30 days after notice thereof shall have been given
     to the Borrower; or

          (f)  Any default on the part of the Borrower or any of its
     Subsidiaries or any Guarantor shall exist, and shall remain unwaived or
     uncured beyond the expiration of any applicable notice and/or grace period,
     under any contract, agreement or undertaking now existing or hereafter
     entered into with or for the benefit of the Bank; or

          (g)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange
     Commission.]; or

          (h)  The Borrower or any Guarantor shall be dissolved; or the Borrower
     or any of its Subsidiaries or any Guarantor shall become bankrupt or shall
     cease paying its debts as they mature or shall make an assignment for the
     benefit of creditors, or a trustee, receiver or liquidator shall be
     appointed for the Borrower or any of its Subsidiaries or any Guarantor or
     for a substantial part of the property of any of the foregoing, or
     bankruptcy, reorganization, arrangement, insolvency or similar proceedings
     shall be instituted by or against the Borrower or any of its Subsidiaries
     or any Guarantor under the laws of any jurisdiction (other than any
     involuntary proceedings which are commenced against the Borrower, any of
     its Subsidiaries or any Guarantor without the consent or acquiescence of
     the Borrower, any such Subsidiary or such Guarantor and are dismissed
     within 60 days after the commencement thereof); or

          (i)  [This paragraph contains confidential information which has
     been omitted, but filed separately with the Securities and Exchange 
     Commission.]; or

          (j)  The Borrower or any Subsidiary of the Borrower or any Guarantor
     shall fail to meet its minimum funding requirements under ERISA with
     respect to any employee benefit plan (or other class of benefit which the
     PBGC has elected to insure) or any such plan shall be the subject of
     termination proceedings (whether voluntary or involuntary) and there shall
     result from such termination proceedings a liability of the Borrower or any
     such Subsidiary or any Guarantor to the PBGC which, in the reasonable
     opinion of the Bank, may have a material adverse effect upon the business,
     operations or financial condition of the Borrower or any such Subsidiary or
     any Guarantor; or

          (k)  The security interest and lien of the Bank in and on any of the
     Collateral shall not be in full force and effect as a fully perfected first
     priority lien for any reason (except due to any failure by the Bank to make
     or maintain appropriate Uniform Commercial Code filings or other required
     filings) and said circumstance shall continue uncured for 15 days after the
     Borrower has knowledge or notice thereof; or

          (l)  For any reason any Affiliate Guaranty shall not be in full force
     and effect as to each Guarantor or any failure or default of any Guarantor
     shall exist thereunder; or

          (m)  There shall occur any other material adverse change in the
     condition (financial or otherwise), operations, properties, assets,
     liabilities or earnings of the Borrower or any Guarantor.

          Section 8.02.  Rights and Remedies Upon Default.  Upon the occurrence
                         --------------------------------
     of any Event of Default and at any time thereafter during the continuance
     thereof, in addition to any other rights and remedies available to the Bank
     hereunder or otherwise, the Bank may exercise any one or more of the
     following rights and remedies (all of which shall be cumulative):

          (a)  Declare the entire unpaid principal amount of the Notes and Loans
     then outstanding, all interest accrued and unpaid with respect to any and
     all of the foregoing, and all other amounts payable under or with respect
     to this Agreement to be forthwith due and payable, whereupon the same shall
     become forthwith due and payable, without presentment, demand, protest or
     notice of any kind, all of which are hereby expressly waived by the
     Borrower; provided, however, that upon the occurrence of any Event of
     Default under Subsection 8.01(h), the Notes, all Loans and all other
     amounts payable under this Agreement will automatically become due and
     payable without any such notice or any such declaration.

          (b)  Declare the Commitment to be terminated, whereupon the same and
     all obligations of the Bank to make Loans shall be terminated forthwith and
     without further notice; provided, however that upon the occurrence of any
     Event of Default under Subsection 8.01(h), the Commitment will
     automatically terminate without any notice and without any such
     declaration.

          (c)  Exercise all of the rights and remedies of a secured party under
     the Uniform Commercial Code.  The Bank may enter upon the Premises or any
     of same and may take physical possession of the Collateral or render the
     Collateral unusable by process of law or peaceably without process of law. 
     The Bank may, with only such demand, advertising or notice as may be
     required by law, sell and deliver any and all Collateral held by it for its
     account at any time or times in one or more private or public sales, for
     cash or credit or otherwise, at such price and upon such terms as the Bank
     deems advisable in its sole discretion; provided that such terms are
     commercially reasonable.  Notice of any public sale shall be sufficient if
     it describes the Collateral to be sold in general terms, stating the
     amounts thereof and the location and nature of the properties covered by
     the security interests and the prior liens thereon, and is published, at
     least once, not less than seven (7) days prior to the sale in any newspaper
     which the Bank may select which newspaper has a general circulation in the
     municipality where the Collateral is located or deemed located.  All
     requirements of reasonable notice shall be met if such notice is sent to
     the Borrower, in the manner provided in Section 11.03 below, at least seven
     (7) days before the time of such sale or disposition.  The Bank may be the
     purchaser at any such sale, if it is public, free from any right of
     redemption.  The proceeds of sale shall be applied first to the costs of
     retaking, refurbishing, storing and selling any Collateral hereunder and to
     other costs of collection and other costs incurred by the Bank, and then to
     the payment of obligations of the Borrower to the Bank.

          (d)  Enforce the provisions of this Agreement by legal proceedings for
     the specific performance of any covenant or agreement contained herein or
     for the enforcement of any other appropriate legal or equitable remedy, and
     the Bank may recover damages caused by any breach by the Borrower of the
     provisions of this Agreement, including court costs, reasonable attorneys'
     fees and other costs and expenses incurred in the enforcement of the
     obligations of the Borrower hereunder.

          (e)  Exercise all rights and remedies hereunder, under the Notes, the
     Affiliate Guaranties and under any other agreement with the Bank, and
     exercise all other rights and remedies which the Bank may have under
     applicable law.

          Section 8.03.  Set-off.  In addition to any rights now or hereafter
                         -------
     granted under applicable law and not by way of limitation of any such
     rights, upon the occurrence of any Event of Default and during the
     continuance thereof, the Bank is hereby authorized at any time or from time
     to time, without presentment, demand, protest or other notice of any kind
     to the Borrower or to any other Person, all of which are hereby expressly
     waived, to set off and to appropriate and apply any and all deposits (other
     than designated payroll accounts) and any other Indebtedness at any time
     held or owing by the Bank or any affiliate of the Bank to or for the credit
     or the account of the Borrower against and on account of the obligations
     and liabilities of the Borrower to the Bank under this Agreement or
     otherwise, irrespective of whether or not the Bank shall have made any
     demand for payment and although said obligations, liabilities or claims, or
     any of them, may then be contingent or unmatured and without regard for the
     availability or adequacy of other collateral.  The Borrower also grants to
     the Bank a security interest with respect to all its deposits and all
     securities or other property in the possession of the Bank or any affiliate
     of the Bank from time to time in order to secure the Loans, the Notes and
     all other amounts now or hereafter due under this Agreement, and, upon the
     occurrence of any Event of Default, the Bank may exercise all rights and
     remedies of a secured party under the Uniform Commercial Code.

          Section 8.04.  Right to Cure.  In the event that the Borrower shall
                         -------------
     fail to pay any tax, assessment, governmental charge or levy, except as the
     same may be otherwise permitted hereunder, or in the event that any lien,
     encumbrance or security interest prohibited hereby shall not be paid in
     full or discharged, or in the event that the Borrower shall fail to pay or
     comply with any other obligation hereunder, the Bank may, but shall not be
     required to, pay, satisfy, perform, discharge or bond the same for the
     account of the Borrower, and all moneys so paid by the Bank shall be
     reimbursed by the Borrower to the Bank on demand and shall bear interest
     from the date of demand until paid at the lesser of (i) a fluctuating rate
     per annum which shall at all times be equal to the sum of two and one-half
     (2-1/2%) percent per annum plus the Base Rate as in effect from time to
     time, or (ii) the maximum rate permitted by then applicable law.  The Bank
     will give the Borrower not less than 30 days' prior notice before acting
     under this Section, except that the Bank may act with less notice (or
     without any notice) in the case of emergency, as reasonably determined by
     the Bank. 

          Section 8.05.  Letters of Credit.  Without limitation of any other
                         -----------------
     right or remedy of the Bank, (i) if an Event of Default shall have occurred
     and the Bank shall have accelerated the Revolving Loans or (ii) if this
     Agreement and/or the revolving financing arrangements described herein
     shall have expired or shall have been earlier terminated by either the Bank
     or the Borrower for any reason, the Borrower will forthwith deposit with
     the Bank in cash a sum equal to the total of all then undrawn amounts of
     all outstanding letters of credit issued by the Bank for the account of the
     Borrower or any Guaranteeing Subsidiary.

                                      ARTICLE IX

                         FURTHER PROVISIONS AS TO RECEIVABLES

          Section 9.01. Furnishing Information.  The Borrower will, at the
                        ----------------------
     Bank's request, deliver confirmatory written assignments of Receivables,
     but the failure to execute or deliver any such assignment shall not affect
     or limit the security interest of the Bank in any Receivable.  Together
     with each such assignment, if the Bank so requests, the Borrower will
     furnish to the Bank copies of invoices to customers or the equivalent and
     original shipping or delivery receipts for merchandise sold.  The Borrower
     shall promptly make, stamp or record such entries or legends on the
     Borrower's books and records or on any of the Collateral as the Bank shall
     reasonably request from time to time to indicate that the Bank has a
     security interest in such Collateral.

          Section 9.02. Returns; Disputes.  Upon the occurrence and during the
                        -----------------
     continuance of any Event of Default, the Bank may settle or adjust disputes
     or claims directly with customers or account debtors for amounts and upon
     terms which it considers advisable.  In all cases, the Borrower's account
     will be credited only with amounts actually received by the Bank.  Whenever
     the Borrower has received collateral of any kind or nature by reason of
     transactions between itself and its customers or account debtors, it will
     hold the same on the Bank's behalf, subject to the Bank's instructions, and
     as property forming part of the Receivables.

          Section 9.03. Collections.  After the occurrence and during the
                        -----------
     continuance of any Event of Default, the Bank or its designee may at any
     time notify customers or account debtors of the Bank's security interest in
     Receivables, collect the same directly, and charge the reasonable
     collection costs and expenses to the Borrower's account.  Whenever the Bank
     deems it desirable that any legal or other action be instituted in order to
     effectuate collection of any Receivable, the Bank may at its option
     reassign any such Receivable to the Borrower (and any such reassignment
     shall be deemed to be without recourse to the Bank in any event) and
     require the Borrower to proceed with such legal or other action at the
     Borrower's sole liability, cost and expense, in which event all amounts
     collected by the Borrower on such Receivable shall nevertheless be subject
     to this Agreement.

                                      ARTICLE X

                              FURTHER RIGHTS OF THE BANK

          Section 10.01.  Further Assurances.  The Borrower shall do all things
                          ------------------
     and deliver all instruments reasonably requested by the Bank to protect or
     perfect any security interest granted or intended to be granted hereunder. 
     If the Borrower fails promptly to comply with any such request, or if any
     Event of Default shall have occurred and be continuing hereunder, the
     Borrower authorizes the Bank to execute, in the name or on behalf of the
     Borrower, any financing statement or other document or instrument that the
     Bank may require to perfect, protect or establish any security interest or
     lien interest to which the Bank may be then entitled hereunder and further
     authorizes the Bank to sign the Borrower's name on the same.  The Borrower
     appoints (but only for the purposes of protecting the Bank's interests)
     such Person or Persons as the Bank may designate as the attorney-in-fact of
     the Borrower with the power (after the occurrence and during the
     continuance of any Event of Default) to endorse the name of the Borrower on
     any checks, notes, drafts or other forms of payment or security relating to
     any Collateral that may come into the possession of the Bank; to sign the
     name of the Borrower on invoices or bills of lading, drafts against
     customers, notices of assignment, verifications and schedules; to demand,
     collect, receive payment of, receipt for, settle, compromise or adjust and
     give discharges and releases in respect of the Receivables or any of them;
     to commence and prosecute any suits, actions or proceedings at law or in
     equity in any court of competent jurisdiction to collect the Receivables or
     any of them and to enforce any other rights in respect thereof or in
     respect of the goods which have given rise thereto; to defend any suit,
     action or proceeding brought against the Borrower in respect of any
     Receivables or the goods which have given rise thereto; to settle,
     compromise or adjust any suit, action or proceeding hereinbefore described
     and, in connection therewith, to give such discharges or releases as the
     Bank may deem appropriate; to notify the U.S. Postal Service authorities to
     change the address for delivery of mail to an address designated by the
     Bank and to open and dispose of mail addressed to the Borrower and,
     generally, to do all things necessary to carry out the intent of this
     Agreement.  This power, being coupled with an interest, is irrevocable, and
     the Borrower approves all acts of such attorney-in-fact.  The powers
     conferred on the Bank by this Section are solely to protect the interests
     of the Bank and shall not impose any duty upon the Bank to exercise any
     such power, and neither the Bank nor any such attorney-in-fact shall be
     liable for any act or omission, error in judgment or mistake of law, except
     for its actual wilful misconduct or bad faith.  The Bank shall have no duty
     as to the collection or protection of any Collateral and shall have no duty
     as to the preservation of rights pertaining thereto, except as provided by
     applicable law.

                                      ARTICLE XI

                                    MISCELLANEOUS

          Section 11.01. No Waiver; Cumulative Remedies.  No failure or delay on
                         ------------------------------
     the part of any party in exercising any right, power or remedy hereunder
     shall operate as a waiver thereof, nor shall any single or partial exercise
     of any such right, power or remedy preclude any other or further exercise
     thereof or the exercise of any other right, power or remedy hereunder.  The
     remedies herein provided are cumulative and not exclusive of any remedies
     provided by law or otherwise available to the Bank.  Such remedies may be
     exercised without resort or regard to any other source of satisfaction of
     any liabilities of the Borrower to the Bank.  The provisions of this
     Agreement are not limited by nor in limitation of any additional or
     inconsistent provisions contained in any Affiliate Guaranty or elsewhere.

          Section 11.02.  Amendments, Waivers and Consents.  Neither this
                          --------------------------------
     Agreement nor any provision hereof may be amended, waived, discharged or
     terminated orally, but only by a writing signed by the party against whom
     enforcement of the amendment, waiver, discharge or termination is sought. 
     Any waiver or consent may be given subject to satisfaction of conditions
     stated therein and any waiver or consent shall be effective only in the
     specific instance and for the specific purpose for which given.

          Section 11.03.  Addresses for Notices, etc.  Except as otherwise
                          ---------------------------
     expressly provided in this Agreement, all notices, requests, demands and
     other communications provided for hereunder shall be in writing and shall
     be mailed or delivered to the applicable party at the address indicated
     below:

          If to the Borrower:

               Medical Diagnostics, Inc.
               6 New England Executive Park
               Burlington, MA  01803
               Attention:  President

          with a copy to:

               Advanced NMR Systems, Inc.
               46 Jonspin Road
               Wilmington, MA  01887
               Attention:  Chairman

                    and

               Gerald J. Billow, Esquire
               Posternak, Blankstein & Lund
               100 Charles River Plaza
               Boston, MA  02114

                    and

               Bruce Rich, Esquire
               Reid & Priest LLP
               40 West 57th Street
               New York, NY  10019-4097

          If to the Bank: 

               Chemical Bank
               c/o Chemical Connecticut Corporation
               3 Landmark Square
               Stamford, CT  06901
               Attention:  David M. Nackley, Senior Vice President

     or, as to each of the foregoing, at such other address as shall be
     designated by such Person in a written notice to the other party complying
     as to delivery with the terms of this Section.  Except as otherwise
     provided herein, all such notices, requests, demands and other
     communications shall be deemed delivered on the earlier of (i) the date
     received or (ii) the date of delivery, refusal or non-delivery indicated on
     the return receipt if deposited in the United States mails, sent postage
     prepaid, registered or certified mail, return receipt requested, postage
     and registration or certification charges prepaid, addressed as aforesaid.

          Section 11.04.  Costs, Expenses and Taxes.  The Borrower agrees to pay
                          -------------------------
     on demand all costs and expenses (including, without limitation, reasonable
     legal fees) of the Bank in connection with the preparation, execution and
     delivery of this Agreement, the Notes and all other instruments and
     documents to be delivered hereunder and any amendments or modifications of
     any of the foregoing, or in connection with the examination, review or
     administration of any of the foregoing, as well as the costs and expenses
     (including, without limitation, the reasonable fees and out-of-pocket
     expenses of legal counsel) incurred by the Bank in connection with
     preserving, enforcing or exercising any rights or remedies under this
     Agreement, the Notes and all other instruments and documents to be
     delivered hereunder, all whether or not legal action is instituted.  In
     addition, the Borrower shall be obligated to pay any and all stamp and
     other taxes payable or determined to be payable in connection with the
     execution and delivery of this Agreement, the Notes and all other
     instruments and documents to be delivered hereunder, and agrees to save the
     Bank harmless from and against any and all liabilities with respect to or
     resulting from any delay in paying or omission to pay such taxes.  Any
     fees, expenses or other charges which the Bank is entitled to receive from
     the Borrower hereunder shall bear interest from the date of demand for
     payment until paid at the lesser of (i) a fluctuating rate per annum which
     shall at all times be equal to the sum of two and one-half (2-1/2%) percent
     per annum plus the Base Rate as in effect from time to time or (ii) the
     maximum rate permitted by then applicable law.  In addition, the Borrower
     shall indemnify and hold harmless the Bank from and against any claim for
     brokerage commissions or other fees arising from the Loans contemplated by
     this Agreement.

          Section 11.05.  Reduction and Termination.  This Agreement may be
                          -------------------------
     terminated by the Borrower at any time upon written notice of such
     termination to the Bank; provided, however, that, unless and until all
     Loans made by the Bank hereunder and all other Indebtedness hereunder of
     the Borrower to the Bank existing (whether or not due) as of the time of
     the receipt of such notice by the Bank shall have been paid in full, such
     termination shall in no way affect the rights and powers granted to the
     Bank in connection with this Agreement, and until such payment in full all
     rights and powers hereby granted to the Bank hereunder shall be and remain
     in full force and effect.

          The Borrower may at any time, by written notice to the Bank, reduce
     the Revolving Commitment Amount; provided that said notice to the Bank
     shall be accompanied by such prepayment of principal as shall be necessary
     to ensure that the Aggregate Revolving Loans do not exceed the Revolving
     Commitment Amount, as same may be so reduced.  Any such reduction notice
     will be irrevocable and any such reduction will be permanent.  Any such
     reduction in the Revolving Commitment Amount will be deemed to cause a like
     reduction in the $6,000,000 amount appearing in Section 2.15.

          Section 11.06.  Representations and Warranties.  All covenants,
                          ------------------------------
     agreements, representations and warranties made herein or in any other
     document delivered by or on behalf of the Borrower or any Guarantor
     pursuant to or in connection with this Agreement are material and shall be
     deemed to have been relied upon by the Bank, notwithstanding any
     investigation heretofore or hereafter made by the Bank and shall survive
     the making of the Loans as herein contemplated, and shall continue in full
     force and effect so long as the Loans or other amount due under this
     Agreement remains outstanding and unpaid.  All statements contained in any
     certificate or other paper delivered to the Bank at any time by or on
     behalf of the Borrower or any Guarantor pursuant hereto shall constitute
     representations and warranties by the Borrower hereunder.

          Section 11.07.  Binding Effect; Assignment.  This Agreement shall be
                          --------------------------
     binding upon the Borrower and its successors and assigns and shall inure to
     the benefit of the Borrower and the Bank and their respective permitted
     successors and assigns.  The Borrower may not assign this Agreement or any
     rights hereunder without the express written consent of the Bank.  The Bank
     may, in accordance with applicable law, assign and/or grant participations
     in this Agreement, any of the Loans and/or the Notes.  The Bank will notify
     the Borrower promptly following any such assignment.

          Section 11.08.  Reproduction of Agreement.  This Agreement and all
                          -------------------------
     other instruments, documents and papers which relate thereto which have
     been or may be hereafter furnished to the Bank may be reproduced by the
     Bank by any photographic, photostatic, micro-card, miniature photographic,
     xerographic or similar process, and the Bank may destroy the original from
     which any document was so reproduced.  Any such reproduction shall be
     admissible in evidence as the original itself in any judicial or
     administrative proceeding (whether or not the original is in existence and
     whether or not such reproduction was made in the regular course of
     business).

          Section 11.09.  Consent to Jurisdiction.  The Borrower irrevocably
                          -----------------------
     submits to the non-exclusive jurisdiction of any New York court or any
     federal court sitting within the Southern District of New York over any
     suit, action or proceeding arising out of or relating to this Agreement. 
     The Borrower irrevocably waives, to the fullest extent permitted by law,
     any objection which it may now or hereafter have to the laying of venue of
     any such suit, action or proceeding brought in such a court and any claim
     that any such suit, action or proceeding has been brought in an
     inconvenient forum.  The Borrower agrees that final judgment in any such
     suit, action or proceeding brought in such a court shall be enforced in any
     court of proper jurisdiction by a suit upon such judgment, provided that
     service of process in such action, suit or proceeding shall have been
     effected upon the Borrower in one of the manners specified in the following
     paragraph of this Section 11.09 or as otherwise permitted by law.

          The Borrower hereby consents to process being served in any suit,
     action or proceeding of the nature referred to in the preceding paragraph
     of this Section 11.09 either (i) by mailing a copy thereof by registered or
     certified mail, postage prepaid, return receipt requested, to it at its
     address set forth in Section 11.03 or (ii) by serving a copy thereof upon
     it at its address set forth in Section 11.03.  The Borrower irrevocably
     waives, to the fullest extent permitted by law, all claims of error by
     reason of any service as contemplated herein and agrees that such service
     shall (x) be deemed in every respect effective service upon the Borrower in
     any such suit, action or proceeding and (y) to the fullest extent permitted
     by law, be taken and held to be valid personal service upon and personal
     delivery to the Borrower.

          Section 11.10.  Governing Law.  This Agreement and the Notes shall be
                          -------------
     governed by, and construed in accordance with, the laws of the State of New
     York.

          Section 11.11.  Severability.  In the event that any provision of this
                          ------------
     Agreement or the application thereof to any Person, property or
     circumstances shall be held to any extent to be invalid or unenforceable,
     the remainder of this Agreement and the application of such provision to
     Persons, properties or circumstances other than those as to which it has
     been held invalid or unenforceable shall not be affected thereby, and each
     provision of this Agreement shall be valid and enforceable to the fullest
     extent permitted by law.

          Section 11.12.  Headings.  Article and Section headings in this
                          --------
     Agreement and any table of contents are included herein for convenience of
     reference only and shall not constitute a part of this Agreement for any
     other purpose.

          Section 11.13.  WAIVER OF TRIAL BY JURY.  THE BORROWER HEREBY
                          -----------------------
     EXPRESSLY KNOWINGLY AND VOLUNTARILY WAIVES ALL BENEFIT AND ADVANTAGE OF ANY
     RIGHT TO TRIAL BY JURY, AND AGREES THAT IT WILL NOT AT ANY TIME INSIST
     UPON, OR PLEAD OR IN ANY MANNER WHATSOEVER CLAIM OR TAKE THE BENEFIT OR
     ADVANTAGE OF, A TRIAL BY JURY IN ANY ACTION ARISING IN CONNECTION WITH THIS
     AGREEMENT, ANY OF THE NOTES OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREBY.
       
          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
     be executed under seal by their respective officers thereunto duly
     authorized as of the date first above written.

                                        MEDICAL DIAGNOSTICS, INC.


                                        By: /s/ John A. Lynch
                                           ----------------------
                                           Its  President


                                        CHEMICAL BANK


                                        By: /s/ Joseph Sacks
                                           ----------------------
                                           Its  Vice President




                                                         Exhibit 10.3




                           GUARANTY AND SECURITY AGREEMENT

                             dated as of August 31, 1995

                                         from

                              ADVANCED NMR SYSTEMS, INC.

                                          to

                                    CHEMICAL BANK


          GUARANTY AND SECURITY AGREEMENT dated as of August 31, 1995 from
     Advanced NMR Systems, Inc., a Delaware corporation (the "Guarantor") to
     Chemical Bank (the "Bank").

                                     WITNESSETH:

          WHEREAS, pursuant to that certain Loan and Security Agreement of even
     date herewith (the "Loan Agreement") between Medical Diagnostics, Inc., a
     Delaware corporation (the "Borrower") and the Bank, the Bank has agreed to
     make loans to the Borrower on the terms and conditions set forth therein;
     and

          WHEREAS, it is a condition precedent to the making of loans by the
     Bank pursuant to the Loan Agreement that the Guarantor shall have executed
     and delivered to the Bank this Agreement and shall have granted to the
     Bank, a security interest in the assets of the Guarantor; and

          WHEREAS, the making of loans to the Borrower pursuant to the Loan
     Agreement will be beneficial to the Guarantor inasmuch as the Guarantor
     owns 100% of the outstanding capital stock of the Borrower; and the
     respective Boards of Directors of the Borrower and of the Guarantor have
     determined the execution, delivery and performance of this Agreement to be
     necessary and convenient to the conduct, promotion and attainment of the
     business of the Guarantor and the Borrower;

          NOW, THEREFORE, for good and valuable consideration, the receipt and
     sufficiency of which are hereby acknowledged, the Guarantor agrees as
     follows:

            
                                      ARTICLE I

                                 CERTAIN DEFINITIONS

          Section 1.01.  Defined Terms.  As used in this Agreement,
                         -------------
     the following terms shall have the meanings set out respectively after
     each:

          "Acquisition" - As defined in the Loan Agreement.

          "Agreement" - This Guaranty and Security Agreement, as same may be
     from time to time amended.

          "AMS" - Advanced Mammography Systems Inc., a Delaware corporation.

          "Base Rate" - As defined in the Loan Agreement.

          "Business Day" - As defined in the Loan Agreement.

          "Charter" - As defined in the Loan Agreement.

          "Collateral" - All of the property, rights and interests of the
     Guarantor described in Section 3.01 below.

          "Current Assets" - As defined in the Loan Agreement.

          "Current Liabilities" - As defined in the Loan Agreement.

          "Default" - Any event or circumstance which, with the passage of time
     or the giving of notice or both, could become an Event of Default.

          "ERISA" - As defined in Subsection 4.01(l) below.

          "Event of Default" - As defined in Section 7.01 below.

          "Guaranteed Obligations" - Any and all indebtedness, liabilities or
     obligations of the Borrower to the Bank, whether joint or several, direct
     or indirect, absolute or contingent, due or to become due, now existing or
     hereafter arising, including, without limitation, those now or hereafter
     arising under any Loan Document and/or with respect to any letter of credit
     now or hereafter issued by the Bank for the account of the Borrower.

          "Guaranty" - The guaranty of the Guarantor set forth in Article II.

          "Indebtedness" - As defined in the Loan Agreement.

          "Inventory" - All goods now owned or hereafter acquired by the
     Guarantor and intended for sale or lease, all raw materials, parts, work-
     in-process and finished goods, and all material and supplies which are used
     or which may be used in manufacturing, selling, packing, shipping,
     advertising or furnishing of goods, whether now owned or hereafter acquired
     or created and wherever located, as well as all proceeds (including,
     without limitation, insurance proceeds) and products of any of the
     foregoing.

          "Loan" - As defined in the Loan Agreement.
          
          "Loan Documents" - The Loan Agreement, the Notes and any other
     instrument or document or loan, credit, letter of credit, reimbursement
     agreement, guaranty, interest rate swap or other agreement relating to
     extension of financial accommodations or other banking services between the
     Borrower and the Bank or made by the Borrower in favor of the Bank, all
     whether now existing or hereafter entered into or delivered.

          "Material Adverse Effect" - Any act, omission or circumstance which
     could reasonably be expected to have a material adverse effect on (i) the
     business, prospects, affairs, operations or condition of the Guarantor and
     the Restricted Subsidiaries taken as a whole, or (ii) the ability of the
     Guarantor to carry out its obligations under this Agreement, or (iii) the
     validity or enforceability of this Agreement.

          "Merger" - As defined in the Loan Agreement.

          "Net Income" - As defined in the Loan Agreement.

          "Notes" - As defined in the Loan Agreement.

          "PGBC" - As defined in Subsection 4.01(l) below.

          "Person" - As defined in the Loan Agreement.

          "Premises" - All locations now or hereafter owned, leased or operated
     by the Guarantor or by any Subsidiary of the Guarantor.

          "Receivables" - All of the Guarantor's present and future accounts,
     accounts receivable and notes, drafts, acceptances and other instruments
     representing or evidencing a right to payment for goods sold or for
     services rendered.

          "Restricted Subsidiaries" - All present and future Subsidiaries of the
     Guarantor, other than (i) AMS, (ii) the Borrower and (iii) any Person which
     is deemed to be a Subsidiary of the Guarantor solely by virtue of the
     Borrower's ownership, directly or indirectly, of the stock or other equity
     interests of such Person.

          "Subordinated Debt" - All Indebtedness hereafter incurred by the
     Guarantor which is fully subordinated to the Guarantor's obligations to the
     Bank under this Agreement, such subordination being evidenced by
     instruments in form and substance satisfactory to the Bank.

          "Subsidiary" - As defined in the Loan Agreement.

          "Tangible Net Worth" - As defined in the Loan Agreement.

          Section 1.02.  Use of Defined Terms.  Any defined term used in the 
                         --------------------
     plural preceded by the definite article shall be taken to encompass all
     members of the relevant class.  Any defined term used in the singular
     preceded by "any" shall be taken to indicate any number of the members of
     the relevant class.

          Section 1.03.  Accounting Terms.  All accounting terms not 
                         ----------------
     specifically defined herein shall be construed in accordance with United
     States generally accepted accounting principles consistently applied on the
     basis used by the concerned entity in prior years.

                                      ARTICLE II

                                       GUARANTY

          Section 2.01.  Guaranty.  In consideration of the Bank making loans to
                         --------
     the Borrower pursuant to the Loan Agreement, the Guarantor hereby
     guaranties to the Bank the due and punctual payment and performance of all
     of the Guaranteed Obligations, as and when the same shall become due and
     payable, whether on demand or at maturity, by declaration or otherwise,
     according to the terms thereof, and all losses, costs, expenses and
     reasonable attorneys' fees and disbursements incurred by reason of a
     default under any of said Guaranteed Obligations continuing beyond the
     expiration of any applicable notice and/or grace period.  In case of
     failure by the Borrower punctually to pay any of the Guaranteed
     Obligations, the Guarantor hereby unconditionally agrees to cause such
     payment to be made punctually as and when the same shall become due and
     payable, whether at maturity or by declaration or otherwise, and as if such
     payment were made by the Borrower.  This Guaranty is an absolute,
     unconditional, unlimited and continuing guaranty of the full and punctual
     payment and performance by the Borrower of the Guaranteed Obligations and
     not merely of their collectibility and is in no way conditioned upon any
     requirement that the Bank first collect or attempt to collect the
     Guaranteed Obligations or any portion thereof from the Borrower or from any
     other guarantor of any of same or resort to any security or other means of
     obtaining payment of any of the Guaranteed Obligations which the Bank now
     has or may acquire after the date hereof, or upon any other contingency
     whatsoever.  Upon and during the continuance of any Event of Default (as
     defined herein), all liabilities and obligations of the Guarantor to the
     Bank, hereunder or otherwise, shall, at the option of the Bank, become
     forthwith due and payable to the Bank without further demand or notice of
     any nature, all of which are expressly waived by the Guarantor.  Payments
     by the Guarantor hereunder may be required by the Bank on any number of
     occasions.

          Section 2.02.  Guarantor's Further Agreements to Pay.  The Guarantor 
                         -------------------------------------
     further agrees, as a principal obligor and not as a guarantor, to pay to
     the Bank forthwith upon demand, in funds immediately available to the Bank,
     all costs and expenses (including court costs and reasonable attorneys'
     fees and disbursements) incurred or expended by the Bank in connection with
     this Guaranty and the enforcement hereof, together with interest on any sum
     now or hereafter payable by the Guarantor under this Agreement, such
     interest to accrue from the date of any demand for payment of such sum to
     the date of payment.  Such interest will be payable at the rate set forth
     in Section 8.04 below.

          Section 2.03.  Bank's Freedom to Deal with Borrower and Other Parties.
                         ------------------------------------------------------
     The Bank shall be at liberty, without giving notice to or obtaining the
     assent of the Guarantor and without relieving the Guarantor of any
     liability hereunder, to deal with the Borrower and with each other party
     who now is or after the date hereof becomes liable in any manner for any of
     the Guaranteed Obligations in such manner as the Bank in its sole
     discretion deems fit.  The Bank has full authority in its sole discretion
     to do any or all of the following things, none of which shall discharge or
     affect the Guarantor's liability hereunder:  (i) extend credit, make loans
     and afford other financial accommodations to the Borrower at such times, in
     such amounts and on such terms as the Bank may approve; (ii) modify, amend,
     vary the terms and grant extensions or renewals of any present or future
     indebtedness or of all or any of the Guaranteed Obligations or any
     instrument relating to or securing same, and, without limitation, this
     Guaranty shall survive payment of the Notes; (iii) grant time, waivers and
     other indulgences in respect thereto; (iv) vary, exchange, release or
     discharge, wholly or partially, or delay or abstain from perfecting and
     enforcing any security or guaranty or other means of obtaining payment of
     any of the Guaranteed Obligations which the Bank now has or acquires after
     the date hereof; (v) take or omit to take any of the actions referred to in
     any Loan Document or other instrument evidencing, securing or relating to
     any of the Guaranteed Obligations or any actions under this Guaranty; (vi)
     fail, omit or delay to enforce, assert or exercise any right, power or
     remedy conferred on the Bank in this Guaranty or in any other Loan Document
     or other instrument evidencing, securing or relating to any of the
     Guaranteed Obligations or take or refrain from taking any other action;
     (vii) accept partial payments from the Borrower or any other party; (viii)
     release or discharge, wholly or partially, the Borrower, any endorser or
     any guarantor, or accept additional collateral for the payment of any
     Guaranteed Obligations; (ix) compromise or make any settlement or other
     arrangement with the Borrower or any such other party; and (x) consent to
     and participate in the proceeds of any assignment, trust or mortgage for
     the benefit of creditors.

          Section 2.04.  Unenforceability of Guaranteed Obligations; Invalidity
                         ------------------------------------------------------
     of Security or Other Guaranties.  If for any reason now or hereafter the
     -------------------------------
     Borrower has no legal existence or is under no legal obligation to
     discharge any of the Guaranteed Obligations undertaken or purported to be
     undertaken by it or on its behalf, or if any of the moneys included in the
     Guaranteed Obligations have become irrecoverable from the Borrower by
     operation of law or for any other reason, this Guaranty shall nevertheless
     be binding on the Guarantor to the same extent as if the Guarantor at all
     times had been the principal debtor on all such Guaranteed Obligations. 
     This Guaranty shall be in addition to any other guaranty or other security
     for the Guaranteed Obligations, and it shall not be prejudiced or rendered
     unenforceable by the invalidity of any such other guaranty or security. 
     The liability of the Guarantor under this Guaranty shall remain in full
     force and effect until payment and performance in full of all of the
     Guaranteed Obligations.  This Guaranty shall continue to be effective or be
     reinstated, as the case may be, if at any time any payment of any of the
     Guaranteed Obligations is rescinded or must otherwise be restored or
     returned by the Bank, upon the insolvency, bankruptcy or reorganization of
     the Borrower or otherwise, all as though such payment had not been made.

          Section 2.05.  Waivers by Guarantor.  The Guarantor waives:  notice of
                         --------------------
     acceptance hereof and reliance hereon, notice of any action taken or
     omitted by the Bank in reliance hereon, any requirement that the Bank be
     diligent or prompt in making demands hereunder, any requirement as to any
     presentment, demand, protest, giving notice of any default by the Borrower
     or asserting any other right of the Bank hereunder and all demands, notices
     and suretyship defenses generally.  The Guarantor also irrevocably waives,
     to the fullest extent permitted by law, all defenses which at any time may
     be available in respect of the Guarantor's obligations hereunder by virtue
     of any statute of limitations, valuation, stay or moratorium law or other
     similar law now or hereafter in effect.

          Without limiting the generality of the foregoing provisions of this
     Guaranty, the liability of the Guarantor shall not be released, discharged
     or otherwise affected by:

              (i) any extension, renewal, settlement, compromise, waiver or
          release in respect of any obligation of the Borrower or any other
          guarantor;

             (ii) any change in the time, manner, amount or place of payment of
          any Guaranteed Obligation or any modification or amendment of or
          supplement to any Loan Document or this Agreement;

            (iii) any release, non-perfection or invalidity of any direct or
          indirect security for any obligation of the Borrower, the Guarantor or
          any other guarantor;

             (iv) any change in the corporate existence, structure, record or
          beneficial ownership or control of the Borrower, the Guarantor or any
          other guarantor, or any insolvency, bankruptcy, reorganization or
          other similar proceeding affecting any such Person or its assets;

              (v) the existence of any claim, set-off or other rights which the
          Guarantor may have at any time against the Borrower, the Bank, any
          other guarantor or any other Person, whether or not arising in
          connection with this Agreement;

             (vi) any invalidity or unenforceability relating to or against the
          Borrower or the Guarantor for any reason under any Loan Document or
          under this Agreement; or any provision of applicable law or regulation
          purporting to prohibit the payment by any Person of the principal of
          or interest on any of the Notes or any other amount payable under any
          Loan Document or this Agreement; or

            (vii) any other act or omission to act or delay of any kind by the
          Borrower, the Bank or any other Person or any other circumstances
          whatsoever which might, but for the provisions of this paragraph,
          constitute a legal or equitable discharge of the Guarantor's
          obligations hereunder.

          Section 2.06.  Subrogation.  The Guarantor hereby irrevocably and 
                         -----------
     unconditionally waives (unless and until all Guaranteed Obligations have
     been indefeasibly paid in full and all commitments of the Bank to the
     Borrower have been terminated and no loan facilities now or hereafter
     established by the Bank for the Borrower remain in effect) any and all
     rights of subrogation, contribution or similar rights which, but for this
     Section 2.06, it might otherwise have in relation to the Borrower or any
     other guarantor as a result of this Agreement.

          Section 2.07.  No Contest with Bank.  No set-off, counterclaim, 
                         --------------------
     reduction or diminution of any obligation, or any claim or defense of any
     kind or nature which the Guarantor has or may have against the Borrower,
     any other guarantor or the Bank shall be available hereunder to the
     Guarantor.  The Guarantor will not, in any proceedings under the Bankruptcy
     Code or insolvency proceedings of any nature, prove in competition with the
     Bank in respect of any payment hereunder or be entitled to have the benefit
     of any counterclaim or proof of claim or dividend or payment by or on
     behalf of the Borrower or the benefit of any other security for any
     Guaranteed Obligation which, now or hereafter, the Guarantor may hold in
     competition with the Bank.

          Section 2.08.  Stay of Acceleration.  If acceleration of the time for 
                         --------------------
     payment of any amount payable by the Borrower under any Loan Document is
     stayed upon the insolvency, bankruptcy or reorganization of the Borrower,
     all such amounts otherwise subject to acceleration under the terms of this
     Guaranty shall nonetheless be payable by the Guarantor hereunder forthwith
     on demand by the Bank.

                                     ARTICLE III

                                       SECURITY

          Section 3.01.  Security.  As security for the payment and performance 
                         --------
     of all of the Guaranteed Obligations and also for the prompt and full
     payment and performance of any and every other liability and obligation of
     the Guarantor to the Bank, whether arising out of this Agreement or
     otherwise, whether otherwise secured or unsecured, direct or indirect,
     absolute or contingent, primary or secondary, due or to become due, and all
     whether now or hereafter existing or arising, the Guarantor hereby pledges,
     grants, assigns and transfers to the Bank, and grants to the Bank a
     security interest in and to, all of the following property of the
     Guarantor, all whether now owned or existing or hereafter acquired or
     arising:

          (a)  All equipment, fixtures, furnishings, furniture, motor vehicles
     and machinery of the Guarantor, wherever located, whether now owned or
     hereafter acquired, whether affixed or moveable, and all replacements of,
     substitutions for and accessions to any of same and all products and
     proceeds (including, without limitation, insurance proceeds) of any of the
     foregoing;

          (b)  All Receivables of the Guarantor;

          (c)  All contract rights of the Guarantor, including, without
     limitation, licenses, employment agreements, any non-competition agreements
     for the benefit of the Guarantor, and all leases and occupancy agreements;
     all obligations owing to the Guarantor of every kind and nature; and all
     tax refunds of every kind and nature, including, without limitation, loss
     carryback refunds; and all of the foregoing whether now existing or
     hereafter acquired or arising;

          (d)  All of the Guarantor's Inventory;

          (e)  All of the Guarantor's general intangibles, choses in action,
     chattel paper, insurance policies, deposits, deposit accounts, money, cash,
     documents and instruments (whether negotiable or non-negotiable and
     regardless of attachment to chattel paper), whether arising out of,
     relating to or evidencing all or any of the foregoing Collateral or
     otherwise, and all whether now existing or hereafter acquired or arising;

          (f)  All goodwill, trade secrets, formulae, customer lists, trade
     names, trademarks, copyrights, patents and licenses (including, without
     limitation, the trademarks, copyrights, patents and licenses listed on
     Exhibit A hereto) and all files, records (including, without limitation,
     computer programs, tapes and related electronic data processing software)
     and writings, whether now owned or hereafter acquired; and

          (g)  All liens, guaranties, securities, rights, remedies and
     privileges pertaining to, and all products and proceeds (including, without
     limitation, insurance proceeds) of, and all accessions to, any of the
     foregoing.

                                      ARTICLE IV

                            REPRESENTATIONS AND WARRANTIES

          Section 4.01.  Representations and Warranties.  As an inducement to
                         ------------------------------
     the Bank to execute the Loan Agreement and to make Loans thereunder to the
     Borrower, the Guarantor hereby represents and warrants to the Bank as
     follows:

          (a)  The Guarantor is a corporation duly organized, validly existing
     and in good standing under the laws of Delaware and has the corporate power
     and authority to enter into and perform this Agreement, to grant the
     security interests described in Section 3.01 above, to enter into and
     perform all obligations required of the Guarantor by any other instruments
     and other documents referred to herein to which it is a party, to fulfill
     its obligations set forth herein and therein and to carry out the
     transactions contemplated hereby and thereby.  The Guarantor has all
     requisite corporate power to own and operate its properties and to carry on
     its business as now conducted and as proposed to be conducted and is duly
     qualified to do business and in good standing in Massachusetts and in each
     other jurisdiction where the Guarantor owns, leases or operates any real or
     personal property and in each other jurisdiction where the failure so to be
     qualified could (singly or in the aggregate with all such other failures to
     be qualified) have a Material Adverse Effect.  At the date of this
     Agreement, except as set forth on Exhibit B hereto, the Guarantor has no
     Subsidiaries and is not a member of any partnership or joint venture.  The
     names and respective jurisdictions of incorporation of all of the
     Guarantor's Subsidiaries and the respective stock ownership in each of them
     is set forth on Exhibit B hereto, together with a description of each such
     partnership and joint venture.

          (b)  Exhibit C hereto sets forth, as of July 28, 1995, each Person who
     owns, of record and/or beneficially, 5% or more of any class of capital
     stock of the Guarantor.  Except as set forth on said Exhibit C, there are
     no outstanding rights, options, warrants, conversion rights or agreements
     or commitments of any kind relating to the aforesaid shares or to the
     authorized and unissued or treasury stock of the Guarantor. 

          (c)  The execution, delivery and performance of this Agreement and the
     other documents required to be executed by the Guarantor pursuant hereto
     have been duly authorized by all necessary corporate action, will not
     require the consent of any third party, and will not conflict with, violate
     the provisions of, or cause a default or constitute an event which, with
     the passage of time or the giving of notice or both, could constitute a
     default on the part of the Guarantor under any contract, agreement, law,
     rule, order, ordinance, franchise, instrument or other document or under
     any provision of the Charter or by-laws of the Guarantor, or result in the
     imposition of any lien or encumbrance on any property or assets of the
     Guarantor, other than in favor of the Bank.  This Agreement and the other
     documents delivered to the Bank by the Guarantor pursuant hereto are the
     legal, valid and binding obligations of the Guarantor, enforceable in
     accordance with their respective terms, in each case except as such
     enforceability may be limited by: (i) the effect of bankruptcy, insolvency,
     reorganization, moratorium or other similar laws affecting the rights and
     remedies of creditors generally or (ii) the effect of general principles of
     equity, whether enforcement is considered in a proceeding in equity or at
     law.

          (d)  Except as disclosed on Exhibit D hereto, there are no actions,
     suits, proceedings or investigations pending or, to the knowledge of the
     Guarantor, threatened (nor, to the knowledge of the Guarantor, is there any
     basis therefor) against or affecting the Guarantor or any of the Restricted
     Subsidiaries by or before any court or governmental department, commission,
     board, bureau, agency or instrumentality, domestic or foreign, which could
     prevent or hinder the consummation of the transactions contemplated hereby
     or call into question the validity of this Agreement or any other
     instrument provided for or contemplated by this Agreement or any action
     taken or to be taken in connection with the transactions contemplated
     hereby or thereby, nor are there any such actions, suits, proceedings or
     investigations pending or, to the knowledge of the Guarantor, threatened,
     anticipated or contemplated which, if determined adversely to the Guarantor
     or any of the Restricted Subsidiaries, in any single case or in the
     aggregate, could have a Material Adverse Effect.

          (e)  Neither the Guarantor nor any of the Restricted Subsidiaries is
     in violation of any term of its Charter or by-laws, as now in effect, nor
     in violation of any term of any mortgage, indenture, judgment, decree or
     order, any other instrument, contract or agreement or of any term of any
     administrative determination, failure to comply with which, singly or in
     the aggregate with all such other failures, could have a Material Adverse
     Effect.

          (f)  The Guarantor and each of the Restricted Subsidiaries has filed
     proper and accurate federal, foreign, state and local tax returns, reports
     and estimates for all years and periods for which any such returns, reports
     or estimates were required to be filed and has paid all taxes, assessments,
     impositions, fees and other governmental charges required to be paid in
     respect of the periods covered by any such returns, reports or estimates,
     other than any such taxes, assessments, impositions, fees and charges which
     the Guarantor or the Restricted Subsidiary concerned is contesting in good
     faith by appropriate proceedings which serve as a matter of law to stay the
     enforcement of any remedy of the relevant taxing authority and as to which
     adequate reserves have been established.  Neither the Guarantor nor any of
     the Restricted Subsidiaries is delinquent in the payment of any tax,
     assessment or governmental charge, and no deficiencies for any tax,
     assessment or governmental charge have been asserted or assessed, and the
     Guarantor knows of no material governmental liability or basis therefor for
     which adequate reserves have not been established.

          (g)  The Guarantor and each of the Restricted Subsidiaries is in
     compliance with all requirements of law, federal, state and local, and all
     requirements of all governmental bodies or agencies having jurisdiction
     over any such Person, the conduct of its business, the use of its
     properties and assets and all Premises occupied by it, failure to comply
     with which could, singly or in the aggregate with all other such failures,
     have a Material Adverse Effect.  Without limiting the foregoing, the
     Guarantor and each of the Restricted Subsidiaries has all the required
     franchises, licenses, permits, certificates and authorizations needed for
     the conduct of its business and the use of its properties and all premises
     occupied by it, as now conducted, owned and used or as proposed to be
     conducted, owned and used; provided that no representation is made herein
     as to any such franchise, license, permit, certificate or authorization if
     the failure to have same could not, singly or in the aggregate with all
     other such failures, have a Material Adverse Effect.  Neither the Guarantor
     nor any such Restricted Subsidiary has received any notice not heretofore
     complied with from any federal, state or local authority or any insurance
     or inspection body that any of its properties, facilities, equipment or
     business procedures or practices fails to comply in any material respect
     with any applicable law, ordinance, regulation, building or zoning law or
     any other requirement of any such authority or body.  No authorization,
     consent, approval, license, exemption of or filing or registration with any
     court or governmental department, commission, board, bureau, agency or
     instrumentality, domestic or foreign, is or will be necessary to the valid
     execution or delivery of, or for the performance by the Guarantor of any of
     its obligations under, this Agreement or any other instrument provided for
     or contemplated by this Agreement.

          (h)  Neither the Guarantor nor any of its Subsidiaries is engaged in
     the business of extending credit for the purpose of purchasing or carrying
     margin stock (within the meaning of Regulation U of the Board of Governors
     of the Federal Reserve System), and no part of the proceeds of any Loan
     will be used to purchase or carry any margin stock or to extend credit to
     others for the purpose of purchasing or carrying any margin stock or in any
     other manner which would involve a violation of any of the regulations of
     the Board of Governors of the Federal Reserve System.  The Guarantor is
     primarily engaged in the business of manufacture and sale of MRI components
     and systems and providing servicing of equipment for the MRI industry.  The
     Guarantor is not an "investment company" nor the "affiliate" of an
     "investment company", as such terms are defined in the Investment Company
     Act of 1940.

          (i)  The Guarantor and each Subsidiary of the Guarantor has good and
     marketable title to all assets now carried on its books, including those
     reflected in its financial statements referred to in Subsection 4.01(j) or
     acquired since the date of such statements, free of any mortgages, pledges,
     charges, liens, security interests or other encumbrances, except as
     permitted under Subsection 5.02(b).  The Guarantor and each Subsidiary of
     the Guarantor enjoys peaceful and undisturbed possession under all material
     leases under which it is operating, and all of such leases are valid and
     subsisting and in full force and effect.

          (j)  The financial statements of the Guarantor for its fiscal year
     ended December 31, 1994 and for the fiscal quarters ended March 31, 1995
     and June 30, 1995, each heretofore delivered to the Bank, fairly present
     the financial condition of the Guarantor as at the dates thereof and for
     the periods covered thereby, subject, as to interim statements, to normal
     year-end audit adjustment (which is not expected to be material) and to the
     absence of footnotes.  Said financial statements have been prepared in
     accordance with generally accepted accounting principles consistently
     applied throughout the relevant periods, subject, as to interim statements,
     to normal year-end audit adjustment (which is not expected to be material)
     and to the absence of footnotes.  Neither the Guarantor nor any of the
     Restricted Subsidiaries has any liability, contingent or otherwise, not
     disclosed in the aforesaid financial statements or in any notes thereto
     that could materially adversely affect the financial condition of the
     Guarantor.

          (k)  The Guarantor and each of the Restricted Subsidiaries owns or has
     a valid right to use all of the patents, licenses, copyrights, trademarks,
     service marks, trade names and franchises ("Intellectual Property") now
     being used or necessary to conduct its business, all of which are described
     on Exhibit A hereto (including, in each case, the owner of such
     Intellectual Property).  None of the Intellectual Property owned by the
     Guarantor or any Restricted Subsidiary is represented by a registered
     patent, copyright, trademark or other federal or state registration, except
     as set forth on Exhibit A hereto.  The conduct of the respective businesses
     of the Guarantor and the Restricted Subsidiaries, as now operated, does not
     conflict with valid patents, licenses, copyrights, trademarks, service
     marks, trade names or franchises of others in any manner that could have a
     Material Adverse Effect.

          (l)  No employee pension benefit plan maintained by the Guarantor or
     any Subsidiary of the Guarantor or in which employees of the Guarantor or
     any Subsidiary of the Guarantor participate has any accumulated funding
     deficiency within the meaning of the Employee Retirement Income Security
     Act of 1974, as amended ("ERISA"), nor does the Guarantor or any Subsidiary
     of the Guarantor have any material liability to the Pension Benefit
     Guaranty Corporation ("PBGC") established under ERISA (or any successor
     thereto) in connection with any employee pension benefit plan (or other
     class of benefit which the PBGC has elected to insure), and there have been
     no "reportable events"  or "prohibited transactions" with respect to any
     such plan, as those terms are defined in Section 4043 of ERISA and
     Section 4975 of the Internal Revenue Code of 1986, as amended,
     respectively.  Except as listed on Exhibit E hereto, neither the Guarantor
     nor any Restricted Subsidiary maintains any profit-sharing, retirement,
     deferred compensation, ESOT, stock bonus, stock option or similar benefit
     plan for any officers or employees.  Said Exhibit E also sets forth all
     employment agreements, management contracts and other written agreements
     with any managers and/or executive officers to which the Guarantor or any
     Restricted Subsidiary is a party.

          (m)  The chief executive offices of the Guarantor are located at One
     Executive Park, Fort Lee, NJ 07024 and the principal place of business of
     the Guarantor is located at 46 Jonspin Road, Wilmington, MA 01887.  The
     Guarantor conducts business under no trade name other than its corporate
     name.

          (n)  All offices, warehouses, sales offices and other business
     locations maintained at the date hereof by the Guarantor are listed on
     Exhibit F hereto.  The Guarantor maintains books and records relating to
     Receivables and other intangible Collateral only at the Guarantor's chief
     executive offices described in Subsection 4.01(m) above, except that
     certain records may be located at the Guarantor's office at One Executive
     Park, Fort Lee, NJ 07024.  At the date hereof, the Guarantor maintains
     Inventory, machinery and/or equipment only at the locations shown on
     Exhibit F hereto.  As to any items of the Collateral which are or are to
     become fixtures, the premises described on Exhibit F constitute the real
     estate concerned.  Said Exhibit F discloses the record owners of each such
     premises. 

          (o)  To the best knowledge of the Guarantor, none of the executive
     officers of the Guarantor or of any Restricted Subsidiary is subject to any
     agreement in favor of anyone other than the Guarantor or such Restricted
     Subsidiary which limits or restricts that person's right to engage in the
     type of business activity conducted or proposed to be conducted by the
     Guarantor or such Restricted Subsidiary or to use therein any property or
     confidential information or which grants to anyone other than the Guarantor
     or such Restricted Subsidiary any rights in any inventions or other ideas
     susceptible to legal protection developed or conceived by any such officer.

          (p)  Neither the Guarantor nor any Restricted Subsidiary is now a
     party to any contract or agreement, the terms of which now have or, as far
     as can be reasonably foreseen, may have a Material Adverse Effect.

          (q)  Neither this Agreement, nor the financial statements referred to
     herein, nor any certificate delivered pursuant to this Agreement, nor any
     other agreement, document, certificate or written statement furnished to
     the Bank by or on behalf of the Guarantor in connection with the
     transactions contemplated by this Agreement contains any untrue statement
     of a material fact or omits to state a material fact necessary in order to
     make the statements contained herein or therein not misleading.  There is
     no fact within the special knowledge of any of the executive officers of
     the Guarantor which has not been disclosed herein or in writing by them to
     the Bank and which materially adversely affects, or in the future in their
     opinion may, insofar as they can now foresee, have a Material Adverse
     Effect.

          (r)  The Merger has been duly consummated in accordance with the
     Merger Agreement dated May 2, 1995 (a copy of which has heretofore been
     provided by the Guarantor to the Bank) and in compliance with all
     applicable laws.

          (s)  After giving effect to the Merger and the transactions
     contemplated thereby and to the extension of financial accommodations
     contemplated by this Agreement, the Guarantor (A) is and will be able to
     pay its debts as they become due, (B) has and will have funds and capital
     sufficient to carry on its business as now conducted or as contemplated to
     be conducted, (C) owns property having a value both at fair valuation and
     at present fair saleable value greater than the amount required to pay its
     debts as they become due, and (D) is not insolvent and will not be rendered
     insolvent as determined by applicable law.


                                      ARTICLE V

                                      COVENANTS

          Section 5.01.  Affirmative Covenants Other Than Reporting
                         ------------------------------------------
     Requirements.  Without limiting any other covenants and provisions hereof,
     ------------
     the Guarantor covenants and agrees that so long as any Guaranteed
     Obligation is outstanding or any obligation of the Guarantor to the Bank,
     under this Agreement or otherwise, remains unpaid:

          (a)  The Guarantor will pay and discharge (and will cause each of the
     Restricted Subsidiaries to pay and discharge) all taxes, assessments and
     governmental charges or levies imposed upon it or them, or upon its or
     their income or profits, or upon any properties belonging to it or them,
     prior to the date on which penalties or interest would attach thereto, and
     all lawful claims which, if unpaid, might become a lien or charge upon any
     properties of the Guarantor or any of the Restricted Subsidiaries; provided
     that neither the Guarantor nor any such Restricted Subsidiary shall be
     required to pay any such tax, assessment, charge, levy or claim which is
     being contested in good faith and by proper proceedings which serve as a
     matter of law to stay the enforcement of any remedy of the taxing authority
     or claimant and as to which the Guarantor or the Restricted Subsidiary
     concerned, as the case may be, shall have set aside on its books adequate
     reserves (or, if such enforcement is not so stayed as a matter of law, a
     surety bond, satisfactory to the Bank as to amount, terms and the identity
     of the surety, shall have been delivered to the Bank).  The Guarantor will
     pay (and will cause each of its Restricted Subsidiaries to pay) in a timely
     manner, all material lease obligations, trade debt and purchase money
     obligations, other than any such lease obligations, trade debt and purchase
     money obligations which the Guarantor or the relevant Restricted Subsidiary
     (as the case may be) is contesting in good faith, with adequate reserves
     having been established, under circumstances in which no material asset or
     interest of the Guarantor or such Restricted Subsidiary would be
     jeopardized.  The Guarantor will fully, faithfully and punctually perform
     and fulfill (and will cause each of its Restricted Subsidiaries fully,
     faithfully and punctually to perform and fulfill) all material covenants
     and agreements under any leases of real estate, agreements relating to
     purchase money debt, equipment leases and other material contracts, other
     than any such covenants and agreements which the Guarantor or the relevant
     Restricted Subsidiary (as the case may be) is contesting in good faith,
     with adequate reserves having been established, under circumstances in
     which no material asset or interest of the Guarantor or such Restricted
     Subsidiary would be jeopardized.

          (b)  The Guarantor will maintain (and will cause each of the
     Restricted Subsidiaries to maintain), with responsible and reputable
     insurance companies or associations reasonably satisfactory to the Bank,
     insurance in such amounts and covering such risks as are typically insured
     by similar businesses (and any such other insurance as the Bank may
     reasonably request from time to time), but in any event in amounts
     sufficient to prevent the Guarantor or any such Restricted Subsidiary from
     becoming a coinsurer.  Without limiting the foregoing, the Guarantor will
     keep the Collateral fully insured against fire, lightning and extended
     coverage perils and against such other risks as the Bank may from time to
     time reasonably require, in an amount at least equal to the full insurable
     value of the Collateral and in any event not less than the amount necessary
     to avoid co-insurance.  Insurance at any one location may be "blanket" with
     insurance at other locations and insurance of the Guarantor and any
     Restricted Subsidiary may be blanket with insurance of other Restricted
     Subsidiaries.  In addition, the Guarantor shall procure and maintain
     general liability insurance with minimum limits of not less than
     $5,000,000.  The Guarantor shall also procure and maintain workmen's
     compensation insurance, employer liability and other insurance as required
     by law.  The Guarantor will also maintain comprehensive automobile
     liability insurance covering all motor vehicles owned or leased by it, with
     combined limits of not less than $1,000,000 for bodily injury and $500,000
     for property damage.  The Guarantor will also maintain (and will cause each
     of the Restricted Subsidiaries to maintain) (i) business interruption
     insurance in amounts satisfactory to the Bank covering all material
     business operations of the Guarantor and each such Restricted Subsidiary
     and (ii) product liability insurance to the extent reasonably requested by
     the Bank.  All insurance herein provided for shall be in such form and
     written by such companies as may from time to time be reasonably approved
     by the Bank.  The Guarantor will assign and deliver to the Bank duplicate
     original copies or certificates for all policies of casualty insurance, as
     collateral and further security for the obligations of the Guarantor herein
     contained, with the Bank named as first loss payee with respect to all
     property in which it holds a security interest (except that the Bank may be
     named as second loss payee with respect to any property as to which the
     Bank holds a security interest subject to another Person's prior security
     interest which is permitted under this Agreement).  All policies of
     insurance shall contain a provision forbidding cancellation of such
     insurance either by the carrier or by the insured until at least 30 days
     after written notice of the proposed cancellation is given to the Bank; and
     whenever any insurance is to expire for any reason, the Guarantor will
     deliver to the Bank, at least 30 days prior to such expiration, a renewal
     or replacement policy, complying with all of the conditions of this
     Subsection.  In addition, the Guarantor will obtain an endorsement with
     respect to all such policies indicating that, solely as to the Bank, the
     insurance shall not be impaired or invalidated by reason of any act or
     neglect of the named insured or any subsequent owner of any of the property
     insured.  Any insurance proceeds received by the Bank may, at the option of
     the Bank, either (i) be applied to the payment or prepayment of any
     obligations of the Guarantor and/or the Borrower to the Bank or (ii) be
     transmitted in whole or in part to the owner of the property damaged or
     destroyed for the purpose of repairing or replacing the same; provided that
     insurance proceeds so received as proceeds of business interruption
     insurance or with respect to damage to or destruction of any equipment will
     (provided that no Event of Default has then occurred and is then
     continuing) be released to the Guarantor.  Any insurance proceeds received
     by the Bank with respect to damage to or destruction of any equipment on
     which it holds a security interest that are released to the Guarantor by
     the Bank shall be used by the Guarantor to repay any outstanding capital
     financing of such damaged or destroyed equipment and to repair or replace
     the damaged or destroyed equipment, with the Bank to receive its same
     priority security interest in the repaired and/or replacement equipment.

          (c)  The Guarantor will preserve and maintain (and will cause each of
     the Restricted Subsidiaries to preserve and maintain) its corporate
     existence, rights, franchises and privileges and remain in good standing in
     the jurisdiction of its incorporation.  The Guarantor will remain qualified
     and in good standing in Massachusetts and will qualify and remain qualified
     (and will cause each of the Restricted Subsidiaries to qualify and remain
     qualified and in good standing) in each other jurisdiction in which it
     maintains a plant, warehouse or office and in each other jurisdiction in
     which the failure so to qualify could have a Material Adverse Effect.

          (d)  The Guarantor will comply (and will cause each of the Restricted
     Subsidiaries to comply) with the requirements of all applicable laws
     (including, without limitation, laws relating to environmental protection),
     rules, regulations and the orders of any court or other tribunal or
     governmental or administrative authority or agency applicable to it or to
     its business, property or assets, all to the extent that failure to comply
     with any such laws, rules, regulations or orders could, singly or in the
     aggregate with all other such failures, have a Material Adverse Effect. 
     The Guarantor will obtain and maintain (and will cause each of the
     Restricted Subsidiaries to obtain and maintain) all licenses, permits and
     permissions relating to its properties or business, failure to obtain or
     maintain which could, singly or in the aggregate with all other such
     failures, have a Material Adverse Effect. 

          (e)  At any reasonable time and from time to time (and at any time and
     as frequently as the Bank requests following the occurrence and during the
     continuance of an Event of Default), the Guarantor will permit (and will
     cause each of the Restricted Subsidiaries to permit) the Bank and any
     agents or representatives thereof to inspect and examine Collateral,
     wherever located, and to examine and make copies of and take abstracts from
     the records and books of account of, and visit the properties of the
     Guarantor and each of the Restricted Subsidiaries, and to discuss the
     affairs, finances and accounts of the Guarantor and any such Restricted
     Subsidiary with any of their respective managers, officers or directors and
     independent accountants, all of whom are hereby authorized and directed to
     cooperate with the Bank in carrying out the intent of this Subsection
     5.01(e).  The Guarantor will, upon request, arrange for the Bank to have
     access to (and facilities for obtaining copies of) all electronically
     stored data and all papers and files of any kind relating to Receivables of
     the Guarantor.

          (f)  The Guarantor will keep proper and complete records and books of
     account in which complete entries will be made in accordance with generally
     accepted accounting principles consistently applied reflecting all
     financial transactions of the Guarantor and its Subsidiaries.  All
     financial statements submitted to the Bank under this Agreement will be
     prepared in accordance with generally accepted accounting principles
     consistently applied, except that interim statements will be subject to
     normal year-end audit adjustment (not to be material) and to the absence of
     footnotes.

          (g)  The Guarantor will maintain and preserve (and will cause each of
     the Restricted Subsidiaries to maintain and preserve) all of their
     respective properties necessary or useful in the proper conduct of their
     respective businesses in good working order and condition (subject to
     ordinary wear and tear), making all necessary repairs thereto and
     replacements thereof; provided that neither the Guarantor nor any
     Restricted Subsidiary will be deemed to be in default under this Subsection
     5.01(g) by reason of any damage by fire or other casualty so long as the
     Guarantor (or such Restricted Subsidiary, as the case may be) repairs
     and/or replaces the damaged property as promptly as reasonably practicable.

          (h)  The Guarantor will maintain experienced and competent
     professional senior management with respect to its business and properties
     and with respect to the Restricted Subsidiaries.

          (i)  The Guarantor will continue to conduct (and will cause each of
     the Restricted Subsidiaries to continue to conduct) in the ordinary course,
     the business in which each of them is presently engaged.  Neither the
     Guarantor nor any of such Restricted Subsidiaries will, without the prior
     written consent of the Bank, directly or indirectly enter into any lines of
     business, businesses or ventures outside of the lines of business conducted
     by the Guarantor at the date hereof.

          (j)  For each fiscal year, the Guarantor and its Subsidiaries will
     achieve an annual consolidated Adjusted Net Income of at least $1.00.  As
     used herein, "Adjusted Net Income" of the Guarantor for any period means
     the sum of: (1) the consolidated Net Income (or consolidated Net Loss,
     expressed as a negative number) of the Guarantor for such period, plus
                                                                       ----
     (2) the amount, if any, representing amortization of goodwill arising from
     the Merger which was actually deducted on the consolidated books of the
     Guarantor in computing the Guarantor's consolidated Net Income (or
     consolidated Net Loss, as the case may be) for such period, plus (3) as to
                                                                 ----
     the computation of Adjusted Net Income for fiscal 1995 only, that amount
     which represents legal, accounting, printing and other actual expenses of
     the Merger (not to exceed $1,500,000 in the aggregate) which were incurred
     by the Borrower and actually deducted on the consolidated books of the
     Guarantor in computing the Guarantor's consolidated Net Income (or
     consolidated Net Loss, as the case may be) for the relevant period.

          (k)  The Guarantor will maintain at all times consolidated Tangible
     Net Worth of the Guarantor and Subsidiaries which will never be less than
     the following:  on September 30, 1995 and at all times thereafter through
     and including September 29, 1996 - not less than $4,000,000; on
     September 30, 1996 and at all times thereafter through and including
     September 29, 1997 - not less than $6,000,000; on September 30, 1997 and at
     all times thereafter through and including September 29, 1998 - not less
     than $8,000,000; and on September 30, 1998 and at all times thereafter -
     not less than $10,000,000.

          (l)  The Guarantor will maintain at all times a ratio of
     (x) consolidated Current Assets of the Guarantor and Subsidiaries to
     (y) consolidated Current Liabilities of the Guarantor and Subsidiaries,
     which ratio will never be less than 1.2 to 1.

          (m)  At all times from the date hereof to March 1, 1996, the Guarantor
     and the Borrower will maintain aggregate cash and cash-equivalents held in
     the name and under the control of the Borrower or the Guarantor totalling
     not less than $6,000,000.

          (n)  Within 60 days after the date hereof, the Guarantor will
     establish with the Bank, and will thereafter maintain with the Bank (and
     cause each of its Restricted Subsidiaries to maintain), its principal
     operating and deposit accounts.

          (o)  In order to induce the Bank to enter into the Loan Agreement and
     to make Loans thereunder to the Borrower, the Guarantor is paying to the
     Bank, as a non-refundable closing fee, the amount of $225,000, of which
     $100,000 has been paid previously and $125,000 is being paid at the date
     hereof.

          Section 5.02.  Negative Covenants.  Without limiting any other
                         ------------------
     covenants and provisions hereof, the Guarantor covenants and agrees that,
     so long as any Guaranteed Obligation is outstanding or any obligation of
     the Guarantor to the Bank, under this Agreement or otherwise, has not been
     fully performed:

          (a)  The Guarantor will not create, incur, assume or suffer to exist
     (nor permit any of the Restricted Subsidiaries to create, incur, assume or
     suffer to exist) any Indebtedness, except for:

              (i)  Indebtedness owed to the Bank, including, without limitation,
          Indebtedness arising out of this Agreement;

             (ii)  Indebtedness of the Guarantor or any such Restricted
          Subsidiary for taxes, assessments and governmental charges or levies,
          to the extent payment thereof shall not at the time be required under
          Subsection 5.01(a) above;

            (iii)  unsecured current liabilities of the Guarantor or any such
          Restricted Subsidiary (other than for money borrowed or for the
          deferred purchase price of property) incurred upon customary terms in
          the ordinary course of business and unsecured advances or progress
          payments under contracts incurred on customary terms in the ordinary
          course of business;

             (iv)  purchase money Indebtedness and capital lease financing owed
          to vendors or lessors of equipment used in the business of the
          Guarantor or any of the Restricted Subsidiaries, such purchase money
          Indebtedness not to exceed $500,000 in aggregate principal amount
          incurred per fiscal year of the Guarantor;

              (v)  Subordinated Debt hereafter incurred by the Guarantor; but
          only if the Bank has given its prior written consent to the financial
          terms and the subordination provisions of such Subordinated Debt;

             (vi)  other Indebtedness existing at the date hereof, but only to
          the extent set forth on Exhibit G hereto; and

            (vii)  and guaranties expressly permitted pursuant to Subsection
          5.02(c) below.

          (b)  The Guarantor will not create, incur, assume or suffer to exist
     (nor permit any of the Restricted Subsidiaries to create, incur, assume or
     suffer to exist) any mortgage, deed of trust, pledge, lien, security
     interest or other charge or encumbrance (including the lien or retained
     security title of a conditional vendor) of any nature (collectively,
     "liens"), upon or with respect to any of its property or assets, now owned
     or hereafter acquired, except that the foregoing restrictions shall not
     apply to:

              (i)  liens for taxes, assessments or governmental charges
          or levies on property of the Guarantor or any of the Restricted
          Subsidiaries if the same shall not at the time be delinquent or
          thereafter can be paid without interest or penalty or are being
          contested in good faith and by appropriate proceedings which serve as
          a matter of law to stay the enforcement of any remedies of the taxing
          authorities and as to which adequate reserves have been made (or, if
          such enforcement is not stayed as a matter of law, a surety bond
          satisfactory to the Bank as to amount, terms and the identity of the
          surety has been delivered to the Bank);

             (ii)  liens imposed by law, such as carriers', warehousemen's and
          mechanics' liens and other similar liens arising in the ordinary
          course of business for sums not yet due or which are being contested
          in good faith and by appropriate proceedings which serve as a matter
          of law to stay the enforcement thereof and as to which adequate
          reserves have been made (or, if such enforcement is not stayed as a
          matter of law, a surety bond satisfactory to the Bank as to amount,
          terms and the identity of the surety has been delivered to the Bank);

            (iii)  pledges or deposits under workmen's compensation laws,
          unemployment insurance, social security, retirement benefits or
          similar legislation;

             (iv)  liens existing on the date hereof to the extent listed on
          Exhibit G hereto; 

              (v)  liens securing the performance of bids, tenders, contracts
          (other than for the repayment of borrowed money), statutory
          obligations and surety bonds arising in the ordinary course of
          business;

             (vi)  zoning restrictions, easements and rights or restrictions of
          record on the use of real property which do not materially detract
          from its value or impair its use;

            (vii)  capital leases and liens securing the purchase price of
          property (to the extent such capital leases and purchases are
          permitted by clause (iv) of Subsection 5.02(a) above), provided that
                                                                 --------
          each such lien is given solely to secure the purchase price of such
          property, does not extend to any other property and is given at the
          time of the acquisition of such property; and

           (viii)  liens in favor of the Bank.

          (c)  The Guarantor will not assume, guarantee, endorse or otherwise
     become directly or contingently liable (nor permit any of the Restricted
     Subsidiaries to assume, guarantee, endorse or otherwise become directly or
     contingently liable), including, without limitation, liable by way of
     agreement, contingent or otherwise, to purchase, to provide funds for
     payment, to supply funds to or otherwise invest in any debtor or otherwise
     to assure any creditor against loss, in connection with any Indebtedness of
     any other Person, except (i) guaranties by endorsement for deposit or
     collection in the ordinary course of business, (ii) any guaranty in favor
     of the Bank and (iii) any guaranty given by the Guarantor with respect to
     any purchase money Indebtedness or capital lease financing hereafter
     incurred by the Borrower or any Subsidiary, so long as the incurrence of
     such purchase money Indebtedness or capital lease financing is expressly
     permitted pursuant to clause (iv) of Subsection 5.02(a) above or by clause
     (iv) and (vii) of Subsection 7.02(a) of the Loan Agreement and provided
     that the Guarantor shall provide notice to the Bank of any guaranty given
     pursuant to this Subsection 5.02(c)(iii).

          (d)  Except as otherwise provided in the second sentence of this
     Subsection, the Guarantor will not liquidate or dissolve, or merge or
     consolidate with any other Person, or sell, assign, lease or otherwise
     dispose of (whether in one transaction or in a series of transactions) any
     item or items material to its business (whether now owned or hereafter
     acquired) included in the assets of the Guarantor (nor will the Guarantor
     permit any of the Restricted Subsidiaries to do any of the foregoing),
     except that the Guarantor and the Restricted Subsidiaries may sell or
     dispose of property through (i) sales of Inventory in the ordinary course
     of business, (ii) disposal of worn out or obsolete equipment in the
     ordinary course of business, (iii) sale or disposal in any one fiscal year
     of items aggregating not more than five (5%) percent of the consolidated
     Tangible Net Worth of the Guarantor measured as at the beginning of such
     year and (iv) permitted sales of common stock of AMS, if any, under the
     Pledge Agreement between the Guarantor and the Bank of even date herewith. 
     Notwithstanding the foregoing, (i) any Restricted Subsidiary may be merged
     into the Guarantor provided that no Event of Default has occurred and is
     then continuing, (ii) any Restricted Subsidiary may be merged into any
     other Restricted Subsidiary and (iii) the Guarantor's percentage ownership
     of AMS may be reduced due to the forfeiture of certain shares of common
     stock of AMS presently held in escrow.  Neither the Guarantor nor any of
     the Restricted Subsidiaries will make any Acquisition without the prior
     written consent of the Bank.

          (e)  The Guarantor will not sell, assign, factor or dispose in any way
     of any of its Receivables or other rights to payment, with or without
     recourse, except for assignment for collection in the ordinary course of
     business, nor will the Guarantor permit any of the Restricted Subsidiaries
     to do any of the foregoing.

          (f)  The Guarantor will not make or maintain, nor permit any of the
     Restricted Subsidiaries to make or maintain, any loan or advance to any
     Person, or purchase or otherwise acquire, or permit any of the Restricted
     Subsidiaries to purchase or otherwise acquire, the capital stock, assets
     comprising the business of, or obligations of, or any interest in, any
     Person, except the following investments by the Guarantor or any such
     Restricted Subsidiary:

              (i)  readily marketable evidences of indebtedness issued or
          guaranteed by the United States of America which have a maturity of
          not more than one year from the date of acquisition;

             (ii)  dollar-denominated certificates of deposit, notes,
          acceptances and repurchase agreements having a maturity of not more
          than one year from the date of acquisition issued by the Bank or by
          any other commercial bank organized in the United States, provided in
          the case of such other bank that such other bank has capital and
          surplus of at least $1,000,000,000 and has long-term debt with a
          rating of investment grade or better by Standard & Poor's Corporation
          and/or Moody's Investors Service, Inc.; and interest-bearing accounts
          in the Bank or in any such other bank;

            (iii)  commercial paper rated A-1/P-1 or better;

             (iv)  travel advances, advances for moving and relocation expenses
          and similar advances to employees in the ordinary course of the
          Guarantor's business; and

              (v)  investments by the Guarantor or any Restricted Subsidiaries
          in, and loans and advances by the Guarantor to, any Subsidiary or
          joint venture to the extent disclosed on Exhibit H hereto;

          Nothing contained in this Subsection 5.02(f) shall permit the Borrower
     or any other Person to use, directly or indirectly, proceeds of any Loan
     for the purpose, whether immediate, incidental or ultimate, of purchasing
     or carrying any "margin stock" within the meaning of Regulation U.

          (g)  The Guarantor will not establish (nor permit any of its
     Subsidiaries to establish) any new pension or defined benefit plan or
     modify any such existing plan for employees subject to ERISA, which plan
     provides any benefits based on past service, without the advance consent of
     the Bank to the amount of the aggregate past service liability thereby
     created.

          (h)  The Guarantor will not waive (nor permit any of the Restricted
     Subsidiaries to waive) any debt or claim, except in the ordinary course of
     its business.

          (i)  The Guarantor will not make, directly or indirectly, any optional
     or voluntary prepayment or purchase of Subordinated Debt, nor make any
     payment of any Subordinated Debt except to the extent expressly permitted
     in the Subordination Agreement relating thereto.  The Guarantor will not at
     any time make any payment on account of principal of and/or interest on any
     Subordinated Debt unless at the time of such payment (and after giving
     effect to any such payment of principal and/or interest) no Default nor any
     Event of Default shall have occurred and be continuing.

          (j)  The Guarantor will not remove (nor permit to be removed) from the
     Premises listed on Exhibit F any books or records relating to Receivables
     or other intangible Collateral of the Guarantor nor remove therefrom any
     tangible Collateral (other than Inventory sold to customers in the ordinary
     course of the Guarantor's business) until after receipt of a certificate
     from the Bank, signed by an officer thereof, stating that the Bank has, to
     its satisfaction, obtained all documentation that it deems necessary or
     desirable to obtain, maintain, perfect and confirm the first priority
     security interests granted or intended to be granted herein.

          (k)  The Guarantor will not move its chief executive offices or
     principal place of business from the address described in
     Subsection 4.01(m) nor change its name or identity nor use any trade name
     or trade style other than its corporate name nor make or suffer to be made
     any change in its corporate structure until, in each case, after receipt of
     a certificate from the Bank, signed by an officer thereof, stating that the
     Bank has, to its satisfaction, obtained all documentation that it deems
     necessary or desirable to obtain, maintain, perfect and confirm the first
     priority security interests granted or intended to be granted herein.

          (l)  The Guarantor will not, without the prior written consent of the
     Bank, declare or pay any dividends, purchase, redeem, retire, or otherwise
     acquire for value any of its capital stock (or rights, options or warrants
     to purchase such shares) now or hereafter outstanding, return any capital
     to its stockholders or make any distribution of assets to its stockholders;
     provided that the Guarantor may redeem shares of its common stock and
     repurchase warrants which had been issued by the Guarantor in connection
     with the Merger so long as (i) at the time of any such redemption or
     repurchase (and after giving effect thereto) no Default nor any Event of
     Default shall have occurred and be continuing, and (ii) the aggregate
     amount expended for all such redemptions and repurchases shall not exceed
     $100,000 per fiscal year of the Guarantor.

          (m)  Neither the Guarantor nor any of the Restricted Subsidiaries will
     become a member of any partnership or joint venture in which another entity
     has the ability to incur any Indebtedness on behalf of the Guarantor or
     such Restricted Subsidiary or to commit any assets of the Guarantor or such
     Restricted Subsidiary without the consent of the Guarantor or such
     Restricted Subsidiary, as the case may be.

          (n)  The Guarantor will not enter into (nor permit any of the
     Restricted Subsidiaries to enter into) any transaction, including, without
     limitation, the purchase, sale or exchange of any property or the rendering
     of any service, with any present or former Affiliate, except in the
     ordinary course of business and pursuant to the reasonable requirements of
     its business and upon fair and reasonable terms no less favorable to the
     Guarantor or such Restricted Subsidiary, as the case may be, than would be
     obtained in a comparable arms'-length transaction with any Person not an
     Affiliate.  As used herein, "Affiliate" of any entity means any officer or
     director of such entity or any Person which, directly or indirectly,
     through one or more intermediaries, controls or is controlled by or is
     under common control with such entity, or any Person which beneficially
     owns or holds five (5%) percent or more of any class of equity securities
     of such entity.  The term "control" means the possession, directly or
     indirectly, of the power to direct or cause the direction of the management
     and policies of any Person, whether through the ownership of voting
     securities, by contract or otherwise.

          (o)  The Guarantor will not dispose of (nor permit any of its
     Subsidiaries to dispose of) any hazardous material or oil on any Premises
     of the Guarantor or any such Subsidiary; nor shall the Guarantor store or
     suffer or permit to exist on any Premises of the Guarantor or any such
     Subsidiary any hazardous material or oil, nor transport or arrange the
     transport of (nor permit any such Subsidiary to transport or arrangement
     the transport of) any hazardous material or oil, except under valid permits
     and licenses and otherwise in compliance with all applicable laws and
     regulations.  The Guarantor shall provide the Bank with prompt written
     notice of (i) any release or threat of release of any hazardous material or
     oil at or from any site or vessel owned, occupied or operated by the
     Guarantor or any such Subsidiary and (ii) any incurrence of any expense or
     loss by any governmental authority in connection with the assessment,
     containment or removal of any hazardous material or oil for which expense
     or loss the Guarantor or any such Subsidiary may be liable.  As used
     herein, the terms "hazardous material" and "oil" have the respective
     meanings ascribed to such terms in Mass. Gen. Laws, Ch. 21E and shall also
     be deemed to include any similar terms in any comparable statute in any
     other relevant jurisdiction.

          (p)  The Guarantor will not suffer or permit to exist any circumstance
     in which the Borrower is not a wholly-owned Subsidiary of the Guarantor or
     in which equity ownership in any entity which is a Subsidiary of the
     Guarantor at the date hereof changes from that shown on Exhibit B hereto,
     except as the Guarantor's ownership of AMS may be decreased by the
     forfeiture of certain shares presently held in escrow.

          (q)  Neither the Guarantor nor any of the Restricted Subsidiaries will
     make any material change in the nature of its business as carried on the
     date hereof.  The Guarantor will not change its fiscal year or accounting
     principles or methods of applying same except as hereinafter provided in
     this Subsection 5.02(q).  The Guarantor is presently considering a change
     in its fiscal year from a year ending December 31 to a year ending
     September 30.  Prior to effecting any such change in fiscal year or any
     change in accounting treatment or classification as to any accounts of the
     Guarantor and/or any of its Subsidiaries, the Guarantor will notify the
     Bank of same in writing and will execute and deliver any amendment to this
     Agreement which the Bank may reasonably deem necessary or desirable in
     order to preserve unimpaired the rights of the Bank and the obligations of
     the Guarantor under this Agreement.

          (r)  The Guarantor will not write up (by creating an appraisal surplus
     or otherwise), nor permit any of its Subsidiaries to write up, the value of
     any assets of the Guarantor or such Subsidiary above their cost to the
     Guarantor or such Subsidiary, as the case may be, less the depreciation
     regularly allowable thereon.

          Section 5.03.  Reporting Requirements.  So long as any Guaranteed
                         ----------------------
     Obligation shall be outstanding or any other obligation of the Guarantor to
     the Bank, under this Agreement or otherwise, shall remain unpaid, the
     Guarantor shall furnish to the Bank:

          (a)  As soon as available and in any event within 45 days after the
     end of each of the first three fiscal quarters in each fiscal year of the
     Guarantor (or within such longer period, not to exceed in any event 50 days
     after the end of the relevant fiscal quarter, as the Securities and
     Exchange Commission may allow for filing of the Guarantor's Quarterly
     Report on Form 10-Q for the fiscal quarter in question), consolidated and
     consolidating balance sheets of Guarantor and Subsidiaries (including the
     Borrower) as at the end of such fiscal quarter and consolidated and
     consolidating statements of income and cash flow for the Guarantor and
     Subsidiaries (including the Borrower) for such fiscal quarter and for the
     period commencing at the end of the previous fiscal year and ending with
     the end of such fiscal quarter, setting forth in each case in comparative
     form the corresponding figures for the corresponding period of the
     preceding fiscal year, all in reasonable detail and duly certified by the
     chief financial officer of the Guarantor as having been prepared in
     accordance with generally accepted accounting principles consistently
     applied, subject to normal year-end audit adjustment and the absence of
     footnotes.

          (b)  As soon as available and in any event within 90 days after the
     end of each fiscal year of the Guarantor (or within such longer period, not
     to exceed in any event 120 days after the end of the relevant fiscal year,
     as the Securities and Exchange Commission may allow for the filing of the
     Guarantor's Annual Report on Form 10-K for the fiscal year in question), a
     copy of the Guarantor's annual audit report for such fiscal year, including
     therein consolidated and consolidating balance sheets of the Guarantor and
     Subsidiaries (including the Borrower) as at the end of such fiscal year and
     consolidated and consolidating statements of income and retained earnings
     and consolidated and consolidating statements of cash flow for the
     Guarantor and Subsidiaries (including the Borrower) for such fiscal year
     (and including statements showing the results of the Guarantor and the
     Borrower for the fourth quarter of such fiscal year of the Guarantor).  The
     annual consolidated statements shall be certified by independent certified
     public accountants selected by the Guarantor and reasonably acceptable to
     the Bank in such form as is generally recognized as "unqualified".  Each of
     the annual financial statements submitted under this Subsection shall be
     accompanied by a statement of the independent certified public accountants
     stating whether in the course of their examination (which shall include a
     review of this Agreement) they became aware of the existence as at the end
     of the fiscal year covered by such financial statements of any event,
     transaction, occurrence or state of affairs which would contravene or
     violate any of the covenants or agreements contained in this Agreement and,
     if their examination has disclosed any such event, transaction, occurrence
     or state of affairs, specifying the nature and period of the existence
     thereof.  Said accountants shall also state that they have examined the
     certificate of the chief financial officer submitted with the annual
     statements of the Guarantor and referred to in Subsection 5.03(c) below and
     that their examination has not disclosed the existence of anything contrary
     to the matters set forth in such certificate.  Such accountants' statement
     shall also include a schedule setting forth the computations necessary to
     determine compliance, as at the relevant fiscal year-end, with each of
     Subsections 5.01(j), 5.01(k), 5.01(l) and 5.01(m) of this Agreement.

          (c)  At the time of delivery of each annual statement of the Guarantor
     and at the time of delivery of the quarterly statement for the first,
     second and third fiscal quarters of each fiscal year for the Guarantor, a
     certificate executed by the chief financial officer of the Guarantor
     stating that he has reviewed this Agreement and has no knowledge of any
     default by the Guarantor in the performance or observance of any of the
     provisions of this Agreement or, if he has such knowledge, specifying each
     such default and the nature thereof, which certificate shall be accompanied
     by a statement of such chief financial officer setting forth in detail the
     computations necessary to determine compliance with the covenants contained
     in Subsections 5.01(j), 5.01(k), 5.01(l) and 5.01(m).

          (d)  Together with the quarterly financial statements described in
     Subsection 5.03(a) above, schedules of Inventory and Receivables (including
     agings) of the Guarantor in such detail as shall be reasonably satisfactory
     to the Bank, such schedules to be certified as accurate by the chief
     financial officer of the Guarantor.

          (e)  Prior to the end of each fiscal year of the Guarantor, a forecast
     for the next following fiscal year for the Guarantor, setting forth on a
     quarterly basis projections as to balance sheets, income statements and
     cash flow statements, all in such detail as will be reasonably satisfactory
     to the Bank.

          (f)  As soon as possible and in any event within five (5) Business
     Days after the occurrence of each Default or Event of Default, the
     statement of the Guarantor setting forth details of such Default or Event
     of Default and the action which the Guarantor proposes to take with respect
     thereto.

          (g)  As soon as possible and in any event within five (5) Business
     Days after the commencement thereof, notice of all actions, suits,
     proceedings and investigations by or before any court or governmental
     department, commission, board, bureau, agency or instrumentality, domestic
     or foreign, affecting the Guarantor or any of its Subsidiaries, excluding,
     however, any such action, suit, proceeding or investigation in which an
     adverse determination could not have a Material Adverse Effect.

          (h)  Promptly after receipt, a copy of all audits or reports submitted
     to the Guarantor by independent public accountants in connection with any
     annual, special or interim audits of the books of the Guarantor and any
     letter of comments directed by such accountants to the management of the
     Guarantor.

          (i)  As soon as possible and in any event within 30 days after the
     Guarantor knows or has reason to know that any event has occurred which
     would constitute a reportable event under Section 4043(b) of Title IV of
     ERISA with respect to any employee pension or other benefit plan in which
     employees of the Guarantor or of any Subsidiary of the Guarantor
     participate, or that the PBGC or the Guarantor or any Subsidiary of the
     Guarantor has instituted or will institute proceedings under such Title to
     terminate such plan, a certificate of the chief financial officer of the
     Guarantor setting forth details as to such termination or other reportable
     event and the action which the Guarantor proposes to take with respect
     thereto, together with a copy of any notice of such reportable event which
     may be required to be filed with the PBGC, or any notice delivered by the
     PBGC evidencing its intent to institute such proceedings, or any notice to
     the PBGC that the plan is to be terminated, as the case may be.

          (j)  A copy of each registration statement and each periodic or
     current report filed by the Guarantor with the Securities and Exchange
     Commission (the "SEC") or any successor agency (other than routine updating
     filings relating to employee benefit plans) and each annual report, proxy
     statement and other communication sent to shareholders or other
     securityholders generally, such copy to be provided to the Bank promptly
     upon such filing with the SEC or such communication with shareholders or
     securityholders, as the case may be.

          (k)  Promptly upon applying for, or being granted, a federal or state
     registration for any copyright, trademark or patent or purchasing any
     registered copyright, trademark or patent, written notice to the Bank
     describing same, together with all such documents as the Bank may prepare
     and reasonably request the Guarantor to execute in order to give the Bank a
     fully perfected first priority security interest in each such copyright,
     trademark or patent.

          (l)  Promptly after the Guarantor has knowledge thereof, written
     notice of:

              (i)  termination or potential termination of any consent, license,
          permit or franchise material to the conduct of the business of the
          Guarantor or of any of its Subsidiaries or the ownership of its or
          their property and assets;

             (ii)  any material loss, damage or destruction to or of any
          property or assets of the Guarantor or of any of its Subsidiaries
          (regardless of whether the same is covered by insurance);

            (iii)  any material controversy with employees of the Guarantor or
          of any of its Subsidiaries or with any labor organization; and

             (iv)  any other material development adversely affecting the
          Guarantor, any of its Subsidiaries or their respective businesses,
          properties, assets or conditions, financial or otherwise.

          (m)  Promptly upon the occurrence of any change in any of the present
     executive officers or directors of the Guarantor, all of whom are listed on
     Exhibit I hereto, a notice of such change.

          (n)  Such other information respecting the financial condition,
     operations, Inventory and Receivables of the Guarantor and/or any of its
     Subsidiaries as the Bank may from time to time reasonably request.

                                      ARTICLE VI

                              FURTHER RIGHTS OF THE BANK

          Section 6.01.  Furnishing Information.  The Guarantor will, at the
                         ----------------------
     Bank's request, deliver confirmatory written assignments of Receivables,
     but the failure to execute or deliver any such assignment shall not affect
     or limit the security interest of the Bank in any Receivable.  Together
     with each such assignment, if the Bank so requests, the Guarantor will
     furnish to the Bank copies of invoices to customers or the equivalent and
     original shipping or delivery receipts for merchandise sold.  The Guarantor
     shall promptly make, stamp or record such entries or legends on the
     Guarantor's books and records or on any of the Collateral as the Bank shall
     reasonably request from time to time to indicate that the Bank has a
     security interest in such Collateral.

          Section 6.02.  Returns; Disputes.  Upon the occurrence and during the
                         -----------------
     continuance of any Event of Default, the Bank may settle or adjust disputes
     or claims directly with customers or account debtors for amounts and upon
     terms which it considers advisable.  In all cases, the Guarantor's account
     will be credited only with amounts actually received by the Bank.  Whenever
     the Guarantor has received collateral of any kind or nature by reason of
     transactions between itself and its customers or account debtors, it will
     hold the same on the Bank's behalf, subject to the Bank's instructions, and
     as property forming part of the Receivables.

          Section 6.03.  Collections.  After the occurrence and during the
                         -----------
     continuance of any Event of Default, the Bank or its designee may at any
     time notify customers or account debtors of the Bank's security interest in
     Receivables, collect the same directly, and charge the reasonable
     collection costs and expenses to the Guarantor's account.  Whenever the
     Bank deems it desirable that any legal or other action be instituted in
     order to effectuate collection of any Receivable, the Bank may at its
     option reassign any such Receivable to the Guarantor (and any such
     reassignment shall be deemed to be without recourse to the Bank in any
     event) and require the Guarantor to proceed with such legal or other action
     at the Guarantor's sole liability, cost and expense, in which event all
     amounts collected by the Guarantor on such Receivable shall nevertheless be
     subject to the this Agreement.

          Section 6.04.  Further Assurances.  The Guarantor shall do all things
                         ------------------
     and deliver all instruments reasonably requested by the Bank to protect or
     perfect any security interest granted or intended to be granted hereunder. 
     If the Guarantor fails promptly to comply with any such request, or if any
     Event of Default shall have occurred and be continuing, the Guarantor
     hereby authorizes the Bank to execute, in the name or on behalf of the
     Guarantor, any financing statements or other document or instrument that
     the Bank may require to perfect, protect or establish any security interest
     or lien interest to which the Bank may be then entitled hereunder and
     further authorizes the Bank to sign the Guarantor's name on the same.  The
     Guarantor appoints (but only for the purposes of protecting the Bank's
     interests) such Person or Persons as the Bank may designate as the
     attorney-in-fact of the Guarantor with the power (after the occurrence and
     during the continuance of an Event of Default) to endorse the name of the
     Guarantor on any checks, notes, drafts or other forms of payment or
     security relating to any Collateral that may come into the possession of
     the Bank; to sign the name of the Guarantor on invoices or bills of lading,
     drafts against customers, notices of assignment, verifications and
     schedules; to demand, collect, receive payment of, receipt for, settle,
     compromise or adjust and give discharges and releases in respect of the
     Receivables or any of them; to commence and prosecute any suits, actions or
     proceedings at law or in equity in any court of competent jurisdiction to
     collect the Receivables or any of them and to enforce any other rights in
     respect thereof or in respect of the goods which have given rise thereto;
     to defend any suit, action or proceeding brought against the Guarantor in
     respect of any Receivables or the goods which have given rise thereto; to
     settle, compromise or adjust any suit, action or proceeding hereinbefore
     described and, in connection therewith, to give such discharges or releases
     as the Bank may deem appropriate; to notify the U.S. Postal Service
     authorities to change the address for delivery of mail to an address
     designated by the Bank and to open and dispose of mail addressed to the
     Guarantor and, generally, to do all things necessary to carry out the
     intent of this Agreement.  This power, being coupled with an interest, is
     irrevocable, and the Guarantor approves all acts of such attorney-in-fact. 
     The powers conferred on the Bank by this Section are solely to protect the
     interests of the Bank and shall not impose any duty upon the Bank to
     exercise any such power, and neither the Bank nor any such attorney-in-fact
     shall be liable for any act or omission, error in judgment or mistake of
     law, except for its actual wilful misconduct or bad faith.  The Bank shall
     have no duty as to the collection or protection of any Collateral and shall
     have no duty as to the preservation of rights pertaining thereto, except as
     provided by applicable law.

                                     ARTICLE VII

                                 DEFAULT AND REMEDIES
                                 --------------------


          Section 7.01.  Events of Default.  An Event of Default will be deemed
                         -----------------
     to have occurred under this Agreement upon the occurrence of any one or
     more of the following:

            (i)     The Guarantor shall fail to make any monetary payment due
     the Bank hereunder when due; or

           (ii)     Any representation or warranty of the Guarantor contained
     herein shall at any time prove to have been incorrect in any material
     respect when made; or

          (iii)     The Guarantor shall fail to perform or observe any
     obligation or agreement contained in any of Subsections 5.01(a) (first
     sentence only), (b), (c)(as applies to corporate existence only), (d), (j),
     (k), (l) or (m) or Section 5.02 or Section 5.03; or

           (iv)     The Guarantor shall fail to perform or observe any other
     obligation or agreement contained herein and such failure shall continue
     unremedied for 30 days after notice thereof shall have been given to the
     Guarantor; or

            (v)     Any "Event of Default" (as defined in the Loan Agreement)
     shall occur and shall continue uncured beyond the expiration of any
     applicable notice and/or grace period.

          Section 7.02.  Rights and Remedies Upon Default.  Upon the occurrence
                         --------------------------------
     of any Event of Default and at any time thereafter during the continuance
     thereof, in addition to any other rights and remedies available to the
     Bank, hereunder or otherwise, the Bank may exercise any one or more of the
     following rights and remedies (all of which shall be cumulative):
          
          (a)  Exercise all of the rights and remedies of a secured party under
     the Uniform Commercial Code.  The Bank may enter upon the Premises or any
     of same and may take physical possession of the Collateral or render the
     Collateral unusable by process of law or peaceably without process of law. 
     The Bank may, with only such demand, advertising or notice as may be
     required by law, sell and deliver any and all Collateral held by it for its
     account at any time or times in one or more private or public sales, for
     cash or credit or otherwise, at such price and upon such terms as the Bank
     deems advisable in its sole discretion; provided that such terms are
     commercially reasonable.  Notice of any public sale shall be sufficient if
     it describes the Collateral to be sold in general terms, stating the
     amounts thereof and the location and nature of the properties covered by
     the security interests and the prior liens thereon, and is published, at
     least once, not less than seven (7) days prior to the sale in any newspaper
     which the Bank may select which newspaper has a general circulation in the
     municipality where the Collateral is located or deemed located.  All
     requirements of reasonable notice shall be met if such notice is sent to
     the Guarantor, in the manner provided in Section 8.03 below, at least seven
     (7) days before the time of such sale or disposition.  The Bank may be the
     purchaser at any such sale, if it is public, free from any right of
     redemption.  The proceeds of sale shall be applied first to the costs of
     retaking, refurbishing, storing and selling any Collateral hereunder and to
     other costs of collection and other costs incurred by the Bank, and then to
     the payment of the Guaranteed Obligations and the other obligations secured
     hereby.

          (b)  Enforce the provisions of this Agreement by legal proceedings for
     the specific performance of any covenant or agreement contained herein or
     for the enforcement of any other appropriate legal or equitable remedy, and
     the Bank may recover damages caused by any breach by the Guarantor of the
     provisions of this Agreement, including court costs, reasonable attorneys'
     fees and other costs and expenses incurred in the enforcement of the
     obligations of the Guarantor hereunder.

          (c)  Exercise all rights and remedies hereunder, under the Loan
     Documents, and under any other agreement with the Bank, and exercise all
     other rights and remedies which the Bank may have under applicable law.

          Section 7.03.  Set-off.  In addition to any rights now or hereafter
                         -------
     granted under applicable law and not by way of limitation of any such
     rights, upon the occurrence of any Event of Default and during the
     continuance thereof, the Bank is hereby authorized at any time or from time
     to time, without presentment, demand, protest or other notice of any kind
     to the Guarantor or to any other Person, all of which are hereby expressly
     waived, to set off and to appropriate and apply any and all deposits (other
     than designated payroll accounts) and any other Indebtedness at any time
     held or owing by the Bank or any affiliate of the Bank to or for the credit
     or the account of the Guarantor against and on account of the obligations
     and liabilities of the Guarantor to the Bank under this Agreement,
     irrespective of whether or not the Bank shall have made any demand for
     payment and although said obligations, liabilities or claims, or any of
     them, may then be contingent or unmatured and without regard for the
     availability or adequacy of other collateral.  The Guarantor also grants to
     the Bank a security interest with respect to all its deposits and all
     securities or other property in the possession of the Bank or any affiliate
     of the Bank from time to time, and, upon the occurrence of any Event of
     Default, the Bank may exercise all rights and remedies of a secured party
     under the Uniform Commercial Code.

          Section 7.04.  Right to Cure.  In the event that the Guarantor shall
                         -------------
     fail to pay any tax, assessment, governmental charge or levy, except as the
     same may be otherwise permitted hereunder, or in the event that any lien,
     encumbrance or security interest prohibited hereby shall not be paid in
     full or discharged, or in the event that the Guarantor shall fail to pay or
     comply with any other obligation hereunder, the Bank may, but shall not be
     required to, pay, satisfy, perform, discharge or bond the same for the
     account of the Guarantor, and all moneys so paid by the Bank shall be
     reimbursed by the Guarantor to the Bank on demand and shall bear interest
     from the date of demand until paid at the lesser of (i) a fluctuating rate
     per annum which shall at all times be equal to the sum of two and one-half
     (2-1/2%) percent per annum plus the Base Rate as in effect from time to
     time, or (ii) the maximum rate permitted by then applicable law.  The Bank
     will give the Guarantor not less than 30 days' prior notice before acting
     under this Section, except that the Bank may act with less notice (or
     without notice) in case of emergency, as reasonably determined by the Bank.

                                     ARTICLE VIII

                                    MISCELLANEOUS

          Section 8.01.  No Waiver; Cumulative Remedies.  No failure or delay on
                         ------------------------------
     the part of any party in exercising any right, power or remedy hereunder
     shall operate as a waiver thereof, nor shall any single or partial exercise
     of any such right, power or remedy preclude any other or further exercise
     thereof or the exercise of any other right, power or remedy hereunder.  The
     remedies herein provided are cumulative and not exclusive of any remedies
     provided by law or otherwise available to the Bank.  Such remedies may be
     exercised without resort or regard to the other source of satisfaction of
     any liabilities of the Guarantor to the Bank.  The provisions of this
     Agreement are not limited by nor in the limitation of any additional or
     inconsistent provisions contained in the Loan Agreement or elsewhere.

          Section 8.02.  Amendments, Waivers and Consents.  Neither this
                         --------------------------------
     Agreement nor any provision hereof may be amended, waived discharged or
     terminated orally.  Any such amendment, waiver, discharge or termination
     must be in writing signed by the party against whom enforcement of the
     amendment, waiver, discharge or termination is sought.  Any waiver or
     consent may be given subject to satisfaction of conditions stated therein
     and any waiver or consent shall be effective only in the specific instance
     and for the specific purpose for which given.

          Section 8.03.  Addresses for Notices, etc.  Except as otherwise
                         ---------------------------
     expressly provided in this Agreement, all notices, requests, demands and
     other communications provided for hereunder shall be in writing and shall
     be mailed or delivered to the applicable party at the address indicated
     below:

          If to the Guarantor:

               Advanced NMR Systems, Inc.
               46 Jonspin Road
               Wilmington, MA  01887
               Attention:  Chairman

          with a copy to:

               Gerald J. Billow, Esquire
               Posternak, Blankstein & Lund
               100 Charles River Plaza
               Boston, MA  02114

          and

               Bruce Rich, Esquire
               Reid & Priest LLP
               40 West 57th Street
               New York, NY  10019-4097

          If to the Bank:

               Chemical Bank
               c/o Chemical Connecticut Corporation
               3 Landmark Square
               Stamford, CT  06901
               Attention:  David M. Nackley, Senior Vice President

     or, as to each of the foregoing, at such other address as shall be
     designated by such Person in a written notice to the other party complying
     as to delivery with the terms of this Section.  Except as otherwise
     provided herein, all such notices, requests, demands and other
     communications shall be deemed delivered on the earlier of (i) the date
     received or (ii) the date of delivery, refusal or non-delivery indicated on
     the return receipt if deposited in the United States mails, sent postage
     prepaid, registered or certified mail, return receipt requested, postage
     and registration or certification charges prepaid, addressed as aforesaid.

          Section 8.04.  Costs, Expenses and Taxes.  The Guarantor agrees to pay
                         -------------------------
     on demand all costs and expenses (including, without limitation, reasonable
     legal fees) of the Bank in connection with the preparation, execution and
     delivery of this Agreement and all other instruments and documents to be
     delivered hereunder and any amendments or modifications of any of the
     foregoing, or in connection with the examination, review or administration
     of any of the foregoing, as well as the costs and expenses (including,
     without limitation, the reasonable fees and out-of-pocket expenses of legal
     counsel) incurred by the Bank in connection with preserving, enforcing or
     exercising any rights or remedies under this Agreement and all other
     instruments and documents to be delivered hereunder, all whether or not
     legal action is instituted.  In addition, the Guarantor shall be obligated
     to pay any and all stamp and other taxes payable or determined to be
     payable in connection with the execution and delivery of this Agreement and
     all other instruments and documents to be delivered hereunder, and agrees
     to save the Bank harmless from and against any and all liabilities with
     respect to or resulting from any delay in paying or omission to pay such
     taxes.  Any fees, expenses or other charges which the Bank is entitled to
     receive from the Guarantor hereunder shall bear interest from the date of
     demand for payment until paid at the lesser of (i) a fluctuating rate per
     annum which shall at all times be equal to the sum of two and one-half
     (2-1/2%) percent per annum plus the Base Rate as in effect from time to
     time or (ii) the maximum rate permitted by then applicable law.

          Section 8.05.  Representations and Warranties.  All covenants,
                         ------------------------------
     agreements, representations and warranties made herein or in any other
     document delivered by or on behalf of the Guarantor pursuant to or in
     connection with this Agreement are material and shall be deemed to have
     been relied upon by the Bank, notwithstanding any investigation heretofore
     or hereafter made by the Bank and shall survive the making of the Loans as
     contemplated in the Loan Agreement, and shall continue in full force and
     effect so long as any of the Guaranteed Obligations or other obligations
     secured hereby remain outstanding and unpaid.  All statements contained in
     any certificate or other paper delivered to the Bank at any time by or on
     behalf of the Guarantor pursuant hereto shall constitute representations
     and warranties by the Guarantor hereunder.

          Section 8.06.  Binding Effect; Assignment.  This Agreement shall be
                         --------------------------
     binding upon the Guarantor and its successors and assigns and shall inure
     to the benefit of the Bank and its successors and assigns.  The Guarantor
     may not assign this Agreement or any rights hereunder without the express
     written consent of the Bank.  The Bank may assign its rights hereunder and
     will give written notice to the Guarantor of any such assignment.

          Section 8.07.  Reproduction of Agreement.  This Agreement and all
                         -------------------------
     other instruments, documents and papers which relate thereto which have
     been or may be hereafter furnished to the Bank may be reproduced by the
     Bank by any photographic, photostatic, micro-card, miniature photographic,
     xerographic or similar process, and the Bank may destroy the original from
     which any document was so reproduced.  Any such reproduction shall be
     admissible in evidence as the original itself in any judicial or
     administrative proceeding (whether or not the original is in existence and
     whether or not such reproduction was made in the regular course of
     business).

          Section 8.08.  Consent to Jurisdiction.  The Guarantor irrevocably
                         -----------------------
     submits to the jurisdiction of any New York court or any federal court
     sitting within the Southern District of New York over any suit, action or
     proceeding arising out of or relating to this Agreement.  The Guarantor
     irrevocably waives, to the fullest extent permitted by law, any objection
     which it may now or hereafter have to the laying of venue of any such suit,
     action or proceeding brought in such a court and any claim that any such
     suit, action or proceeding has been brought in an inconvenient forum.  The
     Guarantor agrees that final judgment in any such suit, action or proceeding
     brought in such a court shall be enforced in any court of proper
     jurisdiction by a suit upon such judgment, provided that service of process
     in such action, suit or proceeding shall have been effected upon the
     Guarantor in one of the manners specified in the following paragraph of
     this Section 8.08 or as otherwise permitted by law.

          The Guarantor hereby consents to process being served in any suit,
     action or proceeding of the nature referred to in the preceding paragraph
     of this Section 8.08 either (i) by mailing a copy thereof by registered or
     certified mail, postage prepaid, return receipt requested, to it at its
     address set forth in Section 8.03 or (ii) by serving a copy thereof upon it
     at its address set forth in Section 8.03.  The Guarantor irrevocably
     waives, to the fullest extent permitted by law, all claims of error by
     reason of any service as contemplated herein and agrees that such service
     shall (x) be deemed in every respect effective service upon the Guarantor
     in any such suit, action or proceeding and (y) to the fullest extent
     permitted by law, be taken and held to be valid personal service upon and
     personal delivery to the Guarantor.

          Section 8.09.  Governing Law.  This Agreement shall be governed by,
                         -------------
     and construed in accordance with, the laws of the State of New York.

          Section 8.10.  Severability.  In the event that any provision of this
                         ------------
     Agreement or the application thereof to any Person, property or
     circumstances shall be held to any extent to be invalid or unenforceable,
     the remainder of this Agreement and the application of such provision to
     Persons, properties or circumstances other than those as to which it has
     been held invalid or unenforceable shall not be affected thereby, and each
     provision of this Agreement shall be valid and enforceable to the fullest
     extent permitted by law.

          Section 8.11.  Headings.  Article and Section headings in this
                         --------
     Agreement are included herein for convenience of reference only and shall
     not constitute a part of this Agreement for any other purpose.

          Section 8.12.  WAIVER OF TRIAL BY JURY.  THE GUARANTOR HEREBY
                         -----------------------
     EXPRESSLY KNOWINGLY AND VOLUNTARILY WAIVES ALL BENEFIT AND ADVANTAGE OF ANY
     RIGHT TO TRIAL BY JURY, AND AGREES THAT IT WILL NOT AT ANY TIME INSIST
     UPON, OR PLEAD OR IN ANY MANNER WHATSOEVER CLAIM OR TAKE THE BENEFIT OR
     ADVANTAGE OF, A TRIAL BY JURY IN ANY ACTION ARISING IN CONNECTION WITH THIS
     AGREEMENT OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREBY.

               IN WITNESS WHEREOF, the Guarantor has caused this Agreement to be
     executed by its duly authorized officer as of the day and year first above
     written.


                                       ADVANCED NMR SYSTEMS, INC.



                                       By:  /s/ Jack Nelson
                                       ____________________________
                                          Name: Jack Nelson
                                          Title:  Chairman


     Accepted:

     CHEMICAL BANK


     By:  /s/ Joseph Sacks
     ______________________________
        Name:  Joseph Sacks
        Title:  Vice President

                                


                                                                EXHIBIT 10.4
                                                                

                           GUARANTY AND SECURITY AGREEMENT

                             dated as of August 31, 1995

                                         from

                     MRI ASSOCIATES, INC., MDI INVESTMENTS, INC.,
                    GREATER SPRINGFIELD MRI, INC., GREATER BOSTON
                MRI SERVICES, INC., MOBILE MRI OF WESTERN MASS., INC.,
                 CENTRAL MASSACHUSETTS MRI SERVICES, INC., CASCO BAY
                  MR SERVICES, INC., MDI FINANCE AND LEASING, INC., 
                MERRIMACK SCANNING, INC., MIDDLESEX MRI CENTER, INC.,
                 MDI-NEW YORK, INC., MDI REHAB, INC., MERITUS HEALTH
                      SYSTEMS, INC., TECHNICIAN SERVICES, INC.,
                         MERITUS-SOUTHWESTERN VIRGINIA, INC.,
                   MERITUS-IOWA, INC., MERITUS WEST VIRGINIA, INC.,
                         MERITUS MRI, INC., MERITUS PLS, INC.
                      AND GREATER BOSTON MRI LIMITED PARTNERSHIP


                                          to

                                    CHEMICAL BANK

     <PAGE>

          GUARANTY AND SECURITY AGREEMENT dated as of August 31, 1995 from MRI
     Associates, Inc., a Massachusetts corporation, MDI Investments, Inc., a
     Massachusetts corporation, Greater Springfield MRI, Inc., a Massachusetts
     corporation, Greater Boston MRI Services, Inc., a Massachusetts
     corporation, Mobile MRI of Western Mass., Inc., a Massachusetts
     corporation, Central Massachusetts MRI Services, Inc., a Massachusetts
     corporation, Casco Bay MR Services, Inc., a Maine corporation, MDI Finance
     and Leasing, Inc., a Massachusetts corporation, Merrimack Scanning, Inc., a
     New Hampshire corporation, Middlesex MRI Center, Inc., a Massachusetts
     corporation, MDI-New York, Inc., a New York corporation, MDI Rehab, Inc., a
     Massachusetts corporation, Meritus Health Systems, Inc., a Virginia
     corporation, Technician Services, Inc., a Virginia corporation, Meritus-
     Southwestern Virginia, Inc., a Virginia corporation, Meritus-Iowa, Inc., a
     Virginia corporation, Meritus West Virginia, Inc., a Virginia corporation,
     Meritus MRI, Inc., a Virginia corporation, Meritus PLS, Inc., a Virginia
     corporation, and Greater Boston MRI Limited Partnership, a Massachusetts
     limited partnership ("Boston LP") (each of the foregoing, a "Guarantor" and
     all of the foregoing, collectively, the "Guarantors") to Chemical Bank (the
     "Bank").

                                     WITNESSETH:

          WHEREAS, pursuant to that certain Loan and Security Agreement of even
     date herewith (the "Loan Agreement") between Medical Diagnostics, Inc., a
     Delaware corporation (the "Borrower") and the Bank, the Bank has agreed to
     make loans to the Borrower on the terms and conditions set forth therein;
     and

          WHEREAS, it is a condition precedent to the making of loans by the
     Bank pursuant to the Loan Agreement that the Guarantors shall have executed
     and delivered to the Bank this Agreement and that the Guarantors (other
     than Greater Springfield MRI, Inc. and Mobile MRI of Western Mass., Inc.)
     shall have granted to the Bank a security interest in the assets of such
     Guarantors; and

          WHEREAS, the making of loans to the Borrower pursuant to the Loan
     Agreement will be beneficial to the Guarantors inasmuch as the Borrower has
     performed in the past and will perform in the future valuable
     administrative, management and accounting services for each of the
     Guarantors and, further, has made and may in the future make available
     financing for certain of the business operations and ventures of the
     Guarantors; and the respective Boards of Directors of the Borrower and of
     each Guarantor have determined the execution, delivery and performance of
     this Agreement to be necessary and convenient to the conduct, promotion and
     attainment of the business of each such Guarantor and the Borrower;

          NOW, THEREFORE, for good and valuable consideration, the receipt and
     sufficiency of which are hereby acknowledged, the Guarantors hereby jointly
     and severally agree as follows:

                                      ARTICLE I

                                 CERTAIN DEFINITIONS

          Section 1.01.  Defined Terms.  As used in this Agreement, the 
                         -------------
     following terms shall have the meanings set out respectively after each:

          "Agreement" - This Guaranty and Security Agreement, as same may be
     from time to time amended.

          "Base Rate" - As defined in the Loan Agreement.

          "Business Day" - As defined in the Loan Agreement.

          "Collateral" - All of the property, rights and interests of any of the
     Guarantors (other than Greater Springfield MRI, Inc. and Mobile MRI of
     Western Mass., Inc.) described in Section 3.01 below.

          "Default" - Any event or circumstance which, with the passage of time
     or the giving of notice or both, could become an Event of Default.

          "Event of Default" - As defined in Section 7.01 below.

          "Guaranteed Obligations" - Any and all indebtedness, liabilities or
     obligations of the Borrower to the Bank, whether joint or several, direct
     or indirect, absolute or contingent, due or to become due, now existing or
     hereafter arising, including, without limitation, those now or hereafter
     arising under any Loan Document and/or with respect to any letter of credit
     now or hereafter issued by the Bank for the account of the Borrower.

          "Guaranty" - The guaranty of the Guarantors set forth in Article II.

          "Indebtedness" - As defined in the Loan Agreement.

          "Inventory" - All goods now owned or hereafter acquired by any
     Guarantor (other than Greater Springfield MRI, Inc. or Mobile MRI of
     Western Mass., Inc.) and intended for sale or lease, all raw materials,
     parts, work-in-process and finished goods, and all material and supplies
     which are used or which may be used in manufacturing, selling, packing,
     shipping, advertising or furnishing of goods, whether now owned or
     hereafter acquired or created and wherever located, as well as all proceeds
     (including, without limitation, insurance proceeds) and products of any of
     the foregoing.

          "Loan" - As defined in the Loan Agreement.

          "Loan Documents" - The Loan Agreement, the Notes and any other
     instrument or document or loan, credit, letter of credit, reimbursement
     agreement, guaranty, interest rate swap or other agreement relating to
     extension of financial accommodations or other banking services between the
     Borrower and the Bank or made by the Borrower in favor of the Bank, all
     whether now existing or hereafter entered into or delivered.

          "Notes" - As defined in the Loan Agreement.

          "Person" - As defined in the Loan Agreement.

          "Receivables" - All of any Guarantor's (other than Greater Springfield
     MRI, Inc.'s and Mobile MRI of Western Mass., Inc.'s) present and future
     accounts, accounts receivable and notes, drafts, acceptances and other
     instruments representing or evidencing a right to payment for goods sold or
     for services rendered.

          "Subsidiary" - As defined in the Loan Agreement.

          Section 1.02.  Use of Defined Terms.  Any defined term used in the 
                         --------------------
     plural preceded by the definite article shall be taken to encompass all
     members of the relevant class.  Any defined term used in the singular
     preceded by "any" shall be taken to indicate any number of the members of
     the relevant class.

          Section 1.03.  Accounting Terms.  All accounting terms not
                         ----------------
     specifically defined herein shall be construed in accordance with United
     States generally accepted accounting principles consistently applied on the
     basis used by the concerned entity in prior years.

                                      ARTICLE II

                                       GUARANTY

          Section 2.01.  Guaranty.  In consideration of the Bank making loans to
                         --------
     the Borrower pursuant to the Loan Agreement, the Guarantors hereby jointly
     and severally guaranty to the Bank the due and punctual payment and
     performance of all of the Guaranteed Obligations, as and when the same
     shall become due and payable, whether on demand or at maturity, by
     declaration or otherwise, according to the terms thereof, and all losses,
     costs, expenses and reasonable attorneys' fees and disbursements incurred
     by reason of a default under any of said Guaranteed Obligations continuing
     beyond the expiration of any applicable notice and/or grace period.  In
     case of failure by the Borrower punctually to pay any of the Guaranteed
     Obligations, the Guarantors and each of them hereby jointly and severally
     unconditionally agrees to cause such payment to be made punctually as and
     when the same shall become due and payable, whether at maturity or by
     declaration or otherwise, and as if such payment were made by the Borrower.
     This Guaranty is an absolute, unconditional, unlimited and continuing
     guaranty of the full and punctual payment and performance by the Borrower
     of the Guaranteed Obligations and not merely of their collectibility and is
     in no way conditioned upon any requirement that the Bank first collect or
     attempt to collect the Guaranteed Obligations or any portion thereof from
     the Borrower (or, as to any Guarantor, from any other Guarantor) or from
     any other guarantor of any of same or resort to any security or other means
     of obtaining payment of any of the Guaranteed Obligations which the Bank
     now has or may acquire after the date hereof, or upon any other contingency
     whatsoever.  Upon and during the continuance of any Event of Default (as
     defined herein), all liabilities and obligations of the Guarantors to the
     Bank, hereunder or otherwise, shall, at the option of the Bank, become
     forthwith due and payable to the Bank without further demand or notice of
     any nature, all of which are expressly waived by the Guarantors.  Payments
     by the Guarantors hereunder may be required by the Bank on any number of
     occasions.

          Section 2.02.  Guarantors' Further Agreements to Pay.  The Guarantors 
                         -------------------------------------
     further jointly and severally agree, as principal obligors and not as
     guarantors, to pay to the Bank forthwith upon demand, in funds immediately
     available to the Bank, all costs and expenses (including court costs and
     reasonable attorneys' fees and disbursements) incurred or expended by the
     Bank in connection with this Guaranty and the enforcement hereof, together
     with interest on any sum now or hereafter payable by the Guarantors under
     this Agreement, such interest to accrue from the date of any demand for
     payment of such sum to the date of payment.  Such interest will be payable
     at the rate set forth in Section 8.04 below.

          Section 2.03.  Bank's Freedom to Deal with Borrower and Other Parties.
                         ------------------------------------------------------
     The Bank shall be at liberty, without giving notice to or obtaining the
     assent of the Guarantors and without relieving the Guarantors of any
     liability hereunder, to deal with the Borrower and with each other party
     who now is or after the date hereof becomes liable in any manner for any of
     the Guaranteed Obligations in such manner as the Bank in its sole
     discretion deems fit.  The Bank has full authority in its sole discretion
     to do any or all of the following things, none of which shall discharge or
     affect the Guarantors' liability hereunder:  (i) extend credit, make loans
     and afford other financial accommodations to the Borrower at such times, in
     such amounts and on such terms as the Bank may approve; (ii) modify, amend,
     vary the terms and grant extensions or renewals of any present or future
     indebtedness or of all or any of the Guaranteed Obligations or any
     instrument relating to or securing same, and, without limitation, this
     Guaranty shall survive payment of the Notes; (iii) grant time, waivers and
     other indulgences in respect thereto; (iv) vary, exchange, release or
     discharge, wholly or partially, or delay or abstain from perfecting and
     enforcing any security or guaranty or other means of obtaining payment of
     any of the Guaranteed Obligations which the Bank now has or acquires after
     the date hereof; (v) take or omit to take any of the actions referred to in
     any Loan Document or other instrument evidencing, securing or relating to
     any of the Guaranteed Obligations or any actions under this Guaranty; (vi)
     fail, omit or delay to enforce, assert or exercise any right, power or
     remedy conferred on the Bank in this Guaranty or in any other Loan Document
     or other instrument evidencing, securing or relating to any of the
     Guaranteed Obligations or take or refrain from taking any other action;
     (vii) accept partial payments from the Borrower or any other party; (viii)
     release or discharge, wholly or partially, the Borrower, any endorser or
     any guarantor, or accept additional collateral for the payment of any
     Guaranteed Obligations; (ix) compromise or make any settlement or other
     arrangement with the Borrower or any such other party; and (x) consent to
     and participate in the proceeds of any assignment, trust or mortgage for
     the benefit of creditors.

          Section 2.04.  Unenforceability of Guaranteed Obligations; Invalidity
                         ------------------------------------------------------
     of Security or Other Guaranties.  If for any reason now or hereafter the
     -------------------------------
     Borrower has no legal existence or is under no legal obligation to
     discharge any of the Guaranteed Obligations undertaken or purported to be
     undertaken by it or on its behalf, or if any of the moneys included in the
     Guaranteed Obligations have become irrecoverable from the Borrower by
     operation of law or for any other reason, this Guaranty shall nevertheless
     be binding jointly and severally on each of the Guarantors to the same
     extent as if each of the Guarantors at all times had been the principal
     debtor on all such Guaranteed Obligations.  This Guaranty shall be in
     addition to any other guaranty or other security for the Guaranteed
     Obligations, and it shall not be prejudiced or rendered unenforceable by
     the invalidity of any such other guaranty or security, nor shall the
     invalidity or unenforceability of this Guaranty as against any one or more
     of the Guarantors prejudice the enforceability of this Guaranty against any
     other Guarantor.  The liability of each Guarantor under this Guaranty shall
     remain in full force and effect until payment and performance in full of
     all of the Guaranteed Obligations.  This Guaranty shall continue to be
     effective or be reinstated, as the case may be, if at any time any payment
     of any of the Guaranteed Obligations is rescinded or must otherwise be
     restored or returned by the Bank, upon the insolvency, bankruptcy or
     reorganization of the Borrower or otherwise, all as though such payment had
     not been made.

          Section 2.05.  Waivers by Guarantors.  Each Guarantor waives:  notice 
                         ---------------------
     of acceptance hereof and reliance hereon, notice of any action taken or
     omitted by the Bank in reliance hereon, any requirement that the Bank be
     diligent or prompt in making demands hereunder, any requirement as to any
     presentment, demand, protest, giving notice of any default by the Borrower
     or asserting any other right of the Bank hereunder and all demands, notices
     and suretyship defenses generally.  Each Guarantor also irrevocably waives,
     to the fullest extent permitted by law, all defenses which at any time may
     be available in respect of such Guarantor's obligations hereunder by virtue
     of any statute of limitations, valuation, stay, homestead or moratorium law
     or other similar law now or hereafter in effect.

          Without limiting the generality of the foregoing provisions of this
     Guaranty, the liability of each Guarantor shall not be released, discharged
     or otherwise affected by:

              (i)  any extension, renewal, settlement, compromise, waiver or
          release in respect of any obligation of the Borrower or any other
          Guarantor or any other guarantor of any of the obligations secured
          hereby;

             (ii)  any change in the time, manner, amount or place of payment of
          any Guaranteed Obligation or any modification or amendment of or
          supplement to any Loan Document or this Agreement;

            (iii)  any release, non-perfection or invalidity of any direct or
          indirect security for any obligation of the Borrower, the Guarantor,
          any other Guarantor or any other guarantor of any of the obligations
          secured hereby;

             (iv)  any change in the corporate existence, structure, record or
          beneficial ownership or control of the Borrower, the Guarantor, any
          other Guarantor or any other guarantor of any of the obligations
          secured hereby, or any insolvency, bankruptcy, reorganization or other
          similar proceeding affecting any such Person or its assets;

              (v)  the existence of any claim, set-off or other rights which the
          Guarantor may have at any time against the Borrower, the Bank, any
          other Guarantor or any other guarantor of any of the obligations
          secured hereby or any other Person, whether or not arising in
          connection with this Agreement;

             (vi)  any invalidity or unenforceability relating to or against the
          Borrower or such Guarantor for any reason under any Loan Document or
          under this Agreement; or any provision of applicable law or regulation
          purporting to prohibit the payment by any Person of the principal of
          or interest on any of the Notes or any other amount payable under any
          Loan Document or this Agreement; or

            (vii)  any other act or omission to act or delay of any kind by the
          Borrower, the Bank or any other Person or any other circumstances
          whatsoever which might, but for the provisions of this paragraph,
          constitute a legal or equitable discharge of such Guarantor's
          obligations hereunder.

          Section 2.06.  Subrogation.  Each Guarantor hereby irrevocably and
                         -----------
     unconditionally waives (unless and until all Guaranteed Obligations have
     been indefeasibly paid in full and all commitments of the Bank to the
     Borrower have been terminated and no loan facilities now or hereafter
     established by the Bank for the Borrower remain in effect) any and all
     rights of subrogation, contribution or similar rights which, but for this
     Section 2.06, it might otherwise have in relation to the Borrower or any
     other Guarantor as a result of this Agreement.

          Section 2.07.  No Contest with Bank.  No set-off, counterclaim,
                         --------------------
     reduction or diminution of any obligation, or any claim or defense of any
     kind or nature which any Guarantor has or may have against the Borrower,
     any other Guarantor or the Bank shall be available hereunder to any
     Guarantor.  No Guarantor will, in any proceedings under the Bankruptcy Code
     or insolvency proceedings of any nature, prove in competition with the Bank
     in respect of any payment hereunder or be entitled to have the benefit of
     any counterclaim or proof of claim or dividend or payment by or on behalf
     of the Borrower or the benefit of any other security for any Guaranteed
     Obligation which, now or hereafter, any Guarantor may hold in competition
     with the Bank.

          Section 2.08.  Stay of Acceleration.  If acceleration of the time for
                         --------------------
     payment of any amount payable by the Borrower under any Loan Document is
     stayed upon the insolvency, bankruptcy or reorganization of the Borrower,
     all such amounts otherwise subject to acceleration under the terms of this
     Guaranty shall nonetheless be payable by the Guarantors hereunder forthwith
     on demand by the Bank.

                                     ARTICLE III

                                       SECURITY

          Section 3.01.  Security.  As security for the payment and performance
                         --------
     of all of the Guaranteed Obligations and also for the prompt and full
     payment and performance of any and every other liability and obligation of
     any one or more of the Guarantors to the Bank, whether arising out of this
     Agreement or otherwise, whether otherwise secured or unsecured, direct or
     indirect, absolute or contingent, primary or secondary, due or to become
     due, and all whether now or hereafter existing or arising, each Guarantor
     (other than Greater Springfield MRI, Inc. and Mobile MRI of Western Mass.,
     Inc.) hereby pledges, grants, assigns and transfers to the Bank, and grants
     to the Bank a security interest in and to, all of the following property of
     such Guarantor, all whether now owned or existing or hereafter acquired or
     arising:

          (a)  All equipment, fixtures, furnishings, furniture, motor vehicles
     and machinery of each Guarantor (other than Greater Springfield MRI, Inc.
     and Mobile MRI of Western Mass., Inc.) (but excepting (i) any personal
     automobiles, (ii) all items of computer equipment financed at the date
     hereof by Fleet Bank of Massachusetts, N.A. and listed on Exhibit A hereto
     and (iii) those items of equipment which are described on Exhibit A
     hereto), wherever located, whether now owned or hereafter acquired, whether
     affixed or moveable, and all replacements of, substitutions for and
     accessions to any of same and all products and proceeds (including, without
     limitation, insurance proceeds) of any of the foregoing;

          (b)  All Receivables of each Guarantor (other than Greater Springfield
     MRI, Inc. and Mobile MRI of Western Mass., Inc.);

          (c)  All contract rights of each Guarantor (other than Greater
     Springfield MRI, Inc. and Mobile MRI of Western Mass., Inc.), including,
     without limitation, licenses, employment agreements, any non-competition
     agreements for the benefit of any Guarantor (other than Greater Springfield
     MRI, Inc. or Mobile MRI of Western Mass., Inc.), and all leases and
     occupancy agreements; all obligations owing to any Guarantor (other than
     Greater Springfield MRI, Inc. or Mobile MRI of Western Mass., Inc.) of
     every kind and nature; and all tax refunds of every kind and nature,
     including, without limitation, loss carryback refunds; and all of the
     foregoing whether now existing or hereafter acquired or arising;

          (d)  All of each Guarantor's (other than Greater Springfield MRI,
     Inc.'s and Mobile MRI of Western Mass., Inc.'s) Inventory;

          (e)  All of each Guarantor's (other than Greater Springfield MRI,
     Inc.'s and Mobile MRI of Western Mass., Inc.'s) general intangibles, choses
     in action, chattel paper, insurance policies, deposits, deposit accounts,
     money, cash, documents and instruments (whether negotiable or non-
     negotiable and regardless of attachment to chattel paper), whether arising
     out of, relating to or evidencing all or any of the foregoing Collateral or
     otherwise, and all whether now existing or hereafter acquired or arising;

          (f)  All goodwill, trade secrets, formulae, customer lists, trade
     names, trademarks, copyrights, patents and licenses (including, without
     limitation, the trademarks, copyrights, patents and licenses listed on
     Exhibit B hereto) and all files, records (including, without limitation,
     computer programs, tapes and related electronic data processing software)
     and writings, whether now owned or hereafter acquired; and

          (g)  All liens, guaranties, securities, rights, remedies and
     privileges pertaining to, and all products and proceeds (including, without
     limitation, insurance proceeds) of, and all accessions to, any of the
     foregoing.

                                      ARTICLE IV

                            REPRESENTATIONS AND WARRANTIES

          Section 4.01.  General Representations and Warranties.  Each Guarantor
                         --------------------------------------
     hereby represents and warrants that:

          (a)  Each Guarantor (i) is a corporation duly incorporated, validly
     existing and in good standing under the laws of the jurisdiction of its
     incorporation as set forth in the introductory paragraph to this Agreement
     (except that Boston LP is a validly existing Massachusetts limited
     partnership), (ii) has the legal power and authority to own its assets and
     to transact the business in which it is now engaged and to enter into and
     perform this Agreement, and (iii) is duly qualified as a foreign
     corporation (or partnership, as the case may be) and in good standing under
     the laws of each jurisdiction in which failure to be so qualified could
     have a material adverse effect on the business, prospects or condition of
     such Guarantor.

          (b)  The execution, delivery and performance by each Guarantor of this
     Agreement, including the granting of the security interests herein granted,
     have been duly authorized by all necessary corporate (and/or partnership)
     action and do not and will not:

              (i)  require any consent or approval of such Guarantor's
          stockholders or equity holders (except any such consents as have been
          heretofore obtained);

             (ii)  contravene its charter or by-laws;

            (iii)  violate any provision of, or require any filing (other than
          the filing of the financing statements with respect to the security
          interests herein granted), registration, consent or approval under,
          any law, rule, regulation (including, without limitation, Regulation
          U), order, writ, judgment, injunction, decree, determination or award
          presently in effect having applicability to any Guarantor;

             (iv)  result in a breach of or constitute a default or require any
          consent under any indenture or loan or credit agreement or any other
          agreement, lease or instrument to which any Guarantor is a party or by
          which any of the Guarantors or any of their respective properties may
          be bound or affected; or

              (v)  result in, or require, the creation or imposition of any
          lien, security interest or other encumbrance (other than in favor of
          the Bank) upon or with respect to any of the properties now owned or
          hereafter acquired by any Guarantor.

          (c)  The Borrower provides valuable administrative, management and
     accounting services to each Guarantor and may make loans to each Guarantor
     to the extent permitted by the Loan Agreement.  The continued financial
     strength of the Borrower and, in particular, its financing arrangements
     with the Bank are thus of direct and substantial benefit to each Guarantor
     and the execution and delivery of this Agreement is a substantial
     inducement for the Bank to enter into and continue said financing
     arrangements.  The Board of Directors of each Guarantor (or the Board of
     Directors of each general partner thereof in the case of a Guarantor which
     is a partnership) has determined the execution, delivery and performance of
     this Agreement to be necessary and convenient to the conduct, promotion and
     attainment of the business of such Guarantor and the Borrower.

          (d)  This Agreement has been duly executed and delivered on behalf of
     each Guarantor and is a legal, valid and binding obligation of each
     Guarantor, enforceable against each Guarantor in accordance with its terms,
     except as such enforceability may be limited by:  (i) the effect of
     bankruptcy, insolvency, reorganization, moratorium or other similar laws
     affecting the rights and remedies of creditors generally or (ii) the effect
     of general principles of equity, whether enforcement is considered in a
     proceeding in equity or at law.

          (e)  Each Guarantor ratifies, with respect to itself, each
     representation and warranty made in the Loan Agreement with respect to a
     "Subsidiary", and each Guarantor confirms that each such representation and
     warranty is true and correct at the date hereof.

          (f)  After giving effect to this Agreement and the transactions
     contemplated hereby, each Guarantor (A) is and will be able to pay its
     debts as they become due, (B) has and will have funds and capital
     sufficient to carry on its business as now conducted or as contemplated to
     be conducted, (C) owns property having a value both at fair valuation and
     at present fair saleable value greater than the amount required to pay its
     debts as they become due, and (D) is not insolvent and will not be rendered
     insolvent as determined by applicable law, after taking into account (i)
     the reasonable likelihood of payments being required hereunder and (ii) the
     availability of contribution and indemnification from other parties, to the
     extent permitted under this Agreement.

          Section 4.02.  Representations and Warranties as to Security.  Each 
                         ---------------------------------------------
     Guarantor further represents and warrants that:

          (a)  The chief executive offices and principal place of business of
     each Guarantor is located at the address shown on Exhibit C attached
     hereto.

          (b)  Each Guarantor (other than Greater Springfield MRI, Inc. and
     Mobile MRI of Western Mass., Inc.) maintains books and records relating to
     Receivables and other intangible Collateral only at the locations described
     on Exhibit D attached hereto.  All tangible Collateral is located at the
     premises shown on Exhibit D attached hereto.  Said Exhibit D also sets
     forth the names of the record owners of each of such premises, as well as
     any other Persons with a record interest in any of said premises.  Said
     Exhibit D also describes all titled motor vehicles owned by any Guarantor
     (other than Greater Springfield MRI, Inc. or Mobile MRI of Western Mass.,
     Inc.) and the jurisdiction in which each such vehicle is titled and
     principally located, as well as the principal locations of all other mobile
     goods.

          (c)  No Guarantor (other than Greater Springfield MRI, Inc. and Mobile
     MRI of Western Mass., Inc.) uses any trade name or style other than its
     corporate name, except as set forth on Exhibit E hereto.

          (d)  Each Guarantor owns all of its Collateral free and clear of all
     liens, security interests, charges and other encumbrances, except liens
     expressly permitted under Subsection 7.02(b) of the Loan Agreement.

          (e)  Each Guarantor owns or has a valid right to use all of the
     patents, licenses, copyrights, trademarks, service marks, trade names and
     franchises ("Intellectual Property") now being used or necessary to conduct
     its business, all of which are described on Exhibit B hereto (including, in
     each case, the owner of such Intellectual Property).  None of the
     Intellectual Property owned by any Guarantor is represented by a registered
     patent, copyright, trademark or other federal or state registration, except
     as set forth on Exhibit B hereto.  The conduct of the business of each
     Guarantor, as now operated, does not conflict with valid patents, licenses,
     copyrights, trademarks, service marks, trade names or franchises of others
     in any manner that could materially adversely affect the business,
     prospects, assets or condition, financial or otherwise, of any Guarantor.

                                      ARTICLE V

                                      COVENANTS

          Section 5.01.  Incorporation by Reference.  (a)  Without limiting or 
                         --------------------------
     being limited by any other provision of this Agreement:

              (i)  each Guarantor shall, and shall cause each of its
          Subsidiaries to, perform, observe and be bound by, for the benefit of
          the Bank, all of the agreements, covenants and obligations (to the
          extent applicable to such Guarantor) set forth in any of Subsections
          7.01(a)-7.01(j), inclusive, and Section 7.03 of the Loan Agreement;
          and

             (ii)  no Guarantor shall perform any act or permit any circumstance
          to exist in contravention of any of the provisions of Section 7.02 of
          the Loan Agreement;

     in each case as each of such provisions is in effect from time to time and
     as if each reference in any of such provisions to a "Subsidiary" or
     "Subsidiaries" referred to each such Guarantor, provided that compliance by
                                                     --------
     the Borrower with Section 7.03 of the Loan Agreement shall, to the extent
     of such compliance as it relates to any Guarantor, be deemed compliance by
     such Guarantor.

          (b)  The above-described provisions of the Loan Agreement, together
     with related definitions and ancillary provisions, are hereby incorporated
     herein by reference, mutatis mutandis, with the same force and effect as if
                          ------- --------
     set forth in full herein.

          Section 5.02.  Removal of Collateral.  None of the Guarantors (other 
                         ---------------------
     than Greater Springfield MRI, Inc. and Mobile MRI of Western Mass., Inc.)
     will remove (or permit to be removed) from the premises listed on Exhibit D
     hereto any books or records relating to Receivables or remove therefrom any
     Collateral (other than Inventory sold to customers in the ordinary course
     and other than mobile goods, which may travel to other locations on a
     temporary basis but will not be removed from the state described in
     Exhibit D as the principal location thereof without prior written notice to
     the Bank) until after receipt of a certificate from the Bank, signed by an
     officer thereof, stating that the Bank has, to its satisfaction, obtained
     all documentation that it deems necessary or desirable to obtain, maintain,
     perfect and confirm the first priority security interests granted or
     intended to be granted herein.

          Section 5.03.  Chief Executive Office.  None of the Guarantors (other 
                         ----------------------
     than Greater Springfield MRI, Inc. and Mobile MRI of Western Mass., Inc.)
     will move its chief executive offices or principal place of business from
     the address shown on Exhibit C hereto nor change its name or identity nor
     use any trade name or trade style other than its corporate name nor make or
     suffer to be made any change in its corporate structure until, in each
     case, after receipt of a certificate from the Bank, signed by an officer
     thereof, stating that the Bank has, to its satisfaction, obtained all
     documentation that it deems necessary or desirable to obtain, maintain,
     perfect and confirm the first priority security interests granted or
     intended to be granted herein.

          Section 5.04.  Insurance.  Each Guarantor will maintain, with 
                         ---------
     responsible and reputable insurance companies or associations reasonably
     satisfactory to the Bank, insurance in such amounts and covering such risks
     as are typically insured by similar businesses (and any such other
     insurance as the Bank may reasonably request from time to time), but in any
     event in amounts sufficient to prevent any such Guarantor from becoming a
     coinsurer.  Without limiting the foregoing, each Guarantor will keep the
     Collateral fully insured against fire, lightning and extended coverage
     perils and against such other risks as the Bank may from time to time
     reasonably require, in an amount at least equal to the full insurable value
     of the Collateral and in any event not less than the amount necessary to
     avoid co-insurance.  Insurance at any one location may be "blanket" with
     insurance at other locations and insurance taken out by any Guarantor may
     be "blanket" with insurance of other affiliates of the Borrower.  In
     addition, each Guarantor shall procure and maintain general liability
     insurance with minimum limits of not less than $5,000,000.  Each Guarantor
     shall also procure and maintain workmen's compensation insurance, employer
     liability and other insurance as required by law.  Each Guarantor will also
     maintain comprehensive automobile liability insurance covering all motor
     vehicles owned or leased by it, with combined limits of not less than
     $1,000,000 for bodily injury and $500,000 for property damage.  Each
     Guarantor will also maintain (i) business interruption insurance in amounts
     satisfactory to the Bank covering all material business operations of the
     Guarantor and (ii) professional liability insurance relating to patient
     care, to the extent relevant.  All insurance herein provided for shall be
     in such form and written by such companies as may from time to time be
     reasonably approved by the Bank.  Each Guarantor will assign and deliver to
     the Bank duplicate original copies or certificates for all policies of
     casualty insurance, as collateral and further security for the obligations
     of such Guarantor herein contained, with the Bank named as first loss payee
     with respect to all property in which it holds a security interest (except
     that the Bank may be named as second loss payee with respect to any
     property as to which the Bank holds a security interest subject to another
     Person's prior security interest which is permitted under the Loan
     Agreement).  All policies of insurance shall contain a provision forbidding
     cancellation of such insurance either by the carrier or by the insured
     until at least 30 days after written notice of the proposed cancellation is
     given to the Bank; and whenever any insurance is to expire for any reason,
     the relevant Guarantor will deliver to the Bank, at least 30 days prior to
     such expiration, a renewal or replacement policy, complying with all of the
     conditions of this Section.  In addition, each Guarantor will obtain an
     endorsement with respect to all such policies indicating that, solely as to
     the Bank, the insurance shall not be impaired or invalidated by reason of
     any act or neglect of the named insured or any subsequent owner of any of
     the property insured.  Any insurance proceeds received by the Bank may, at
     the option of the Bank, either (i) be applied to the payment or prepayment
     of any obligations of any Guarantor and/or the Borrower to the Bank or (ii)
     be transmitted in whole or in part to the owner of the property damaged or
     destroyed for the purpose of repairing or replacing the same; provided that
     insurance proceeds so received as proceeds of business interruption
     insurance or with respect to damage to or destruction of any equipment will
     (provided that no Event of Default has then occurred and is continuing) be
     released to the relevant Guarantor.  Any insurance proceeds received by the
     Bank with respect to damage to or destruction of equipment on which it
     holds a security interest that are released to the Guarantor by the Bank
     shall be used by such Guarantor to repay any outstanding capital financing
     of such damaged or destroyed equipment and to repair or replace the damaged
     or destroyed equipment, with the Bank to receive its same priority security
     interest in the repaired and/or replacement equipment.

          Section 5.05.  Additional Intellectual Property.  If any Guarantor 
                         --------------------------------
     (other than Greater Springfield MRI, Inc. or Mobile MRI of Western Mass.,
     Inc.) applies for, or is granted, a federal or state registration for any
     copyright, trademark or patent or purchases any registered copyright,
     trademark or patent, such Guarantor will give prompt written notice to the
     Bank describing same, together with all such documents as the Bank may
     prepare and reasonably request such Guarantor to execute in order to give
     the Bank a fully perfected first priority security interest in each such
     copyright, trademark or patent.

          Section 5.06.  Additional Information.  Each Guarantor will promptly 
                         ----------------------
     give to the Bank all such information respecting the financial condition,
     operations, Inventory and Receivables of such Guarantor and/or any of its
     Subsidiaries as the Bank may from time to time reasonably request.

                                      ARTICLE VI

                              FURTHER RIGHTS OF THE BANK

          Section 6.01.  Furnishing Information.  Each Guarantor (other than 
                         ----------------------
     Greater Springfield MRI, Inc. and Mobile MRI of Western Mass., Inc.) will,
     at the Bank's request, deliver confirmatory written assignments of
     Receivables, but the failure to execute or deliver any such assignment
     shall not affect or limit the security interest of the Bank in any
     Receivable.  Together with each such assignment, if the Bank so requests,
     each Guarantor (other than Greater Springfield MRI, Inc. and Mobile MRI of
     Western Mass., Inc.) will furnish to the Bank copies of invoices to
     customers or the equivalent and original shipping or delivery receipts for
     merchandise sold.  Each Guarantor (other than Greater Springfield MRI, Inc.
     and Mobile MRI of Western Mass., Inc.) shall promptly make, stamp or record
     such entries or legends on such Guarantor's books and records or on any of
     the Collateral as the Bank shall reasonably request from time to time to
     indicate that the Bank has a security interest in such Collateral.

          Section 6.02.  Returns; Disputes.  Upon the occurrence and during the
                         -----------------
     continuance of any Event of Default, the Bank may settle or adjust disputes
     or claims directly with customers or account debtors for amounts and upon
     terms which it considers advisable.  In all cases, the Guarantors' account
     will be credited only with amounts actually received by the Bank.  Whenever
     any Guarantor (other than Greater Springfield MRI, Inc. or Mobile MRI of
     Western Mass., Inc.) has received collateral of any kind or nature by
     reason of transactions between itself and its customers or account debtors,
     it will hold the same on the Bank's behalf, subject to the Bank's
     instructions, and as property forming part of the Receivables.

          Section 6.03.  Collections.  After the occurrence and during the 
                         -----------
     continuance of any Event of Default, the Bank or its designee may at any
     time notify customers or account debtors of the Bank's security interest in
     Receivables, collect the same directly, and charge the reasonable
     collection costs and expenses to the Guarantors' account.  Whenever the
     Bank deems it desirable that any legal or other action be instituted in
     order to effectuate collection of any Receivable, the Bank may at its
     option reassign any such Receivable to a Guarantor (and any such
     reassignment shall be deemed to be without recourse to the Bank in any
     event) and require such Guarantor to proceed with such legal or other
     action at such Guarantor's sole liability, cost and expense, in which event
     all amounts collected by such Guarantor on such Receivable shall
     nevertheless be subject to this Agreement.

          Section 6.04.  Further Assurances.  The Guarantors (other than Greater
                         ------------------
     Springfield MRI, Inc. and Mobile MRI of Western Mass., Inc.) shall do all
     things and deliver all instruments reasonably requested by the Bank to
     protect or perfect any security interest granted or intended to be granted
     hereunder.  If any Guarantor (other than Greater Springfield MRI, Inc. or
     Mobile MRI of Western Mass., Inc.) fails promptly to comply with any such
     request, or if any Event of Default shall have occurred and be continuing,
     each of such Guarantors authorizes the Bank to execute, in the name or on
     behalf of each such Guarantor, any financing statements or other document
     or instrument that the Bank may require to perfect, protect or establish
     any security interest or lien interest to which the Bank may be then
     entitled hereunder and further authorizes the Bank to sign such Guarantor's
     name on the same.  Each Guarantor (other than Greater Springfield MRI, Inc.
     and Mobile MRI of Western Mass., Inc.) appoints (but only for the purposes
     of protecting the Bank's interests) such Person or Persons as the Bank may
     designate as the attorney-in-fact of each such Guarantor with the power
     (after the occurrence and during the continuance of any Event of Default)
     to endorse the name of such Guarantor on any checks, notes, drafts or other
     forms of payment or security relating to any Collateral that may come into
     the possession of the Bank; to sign the name of any such Guarantor on
     invoices or bills of lading, drafts against customers, notices of
     assignment, verifications and schedules; to demand, collect, receive
     payment of, receipt for, settle, compromise or adjust and give discharges
     and releases in respect of the Receivables or any of them; to commence and
     prosecute any suits, actions or proceedings at law or in equity in any
     court of competent jurisdiction to collect the Receivables or any of them
     and to enforce any other rights in respect thereof or in respect of the
     goods which have given rise thereto; to defend any suit, action or
     proceeding brought against any such Guarantor in respect of any Receivables
     or the goods which have given rise thereto; to settle, compromise or adjust
     any suit, action or proceeding hereinbefore described and, in connection
     therewith, to give such discharges or releases as the Bank may deem
     appropriate; to notify the U.S. Postal Service authorities to change the
     address for delivery of mail to an address designated by the Bank and to
     open and dispose of mail addressed to any such Guarantor and, generally, to
     do all things necessary to carry out the intent of this Agreement.  This
     power, being coupled with an interest, is irrevocable, and the Guarantors
     approve all acts of such attorney-in-fact.  The powers conferred on the
     Bank by this Section are solely to protect the interests of the Bank and
     shall not impose any duty upon the Bank to exercise any such power, and
     neither the Bank nor any such attorney-in-fact shall be liable for any act
     or omission, error in judgment or mistake of law, except for its actual
     wilful misconduct or bad faith.  The Bank shall have no duty as to the
     collection or protection of any Collateral and shall have no duty as to the
     preservation of rights pertaining thereto, except as provided by applicable
     law.

                                     ARTICLE VII

                                 DEFAULT AND REMEDIES
                                 --------------------

          Section 7.01.  Events of Default.  An Event of Default will be deemed
                         -----------------
     to have occurred under this Agreement upon the occurrence of any one or
     more of the following:

            (i)     The Guarantors shall fail to make any monetary payment
     hereunder when due; or

           (ii)     Any representation or warranty of any Guarantor contained
     herein shall at any time prove to have been incorrect in any material
     respect when made; or

          (iii)     Any Guarantor shall fail to perform or observe any
     obligation or agreement contained herein (provided that, with respect to
     those covenants which have been incorporated herein by reference to the
     Loan Agreement, the Guarantors shall have the benefit of such notice and/or
     grace periods as are provided for in the Loan Agreement); or

           (iv)     Any "Event of Default" (as defined in the Loan Agreement)
     shall occur and shall continue uncured beyond the expiration of any
     applicable notice and/or grace period.

          Section 7.02.  Rights and Remedies Upon Default.  Upon the occurrence
                         --------------------------------
     of any Event of Default and at any time thereafter during the continuance
     thereof, in addition to any other rights and remedies available to the Bank
     hereunder or otherwise, the Bank may exercise any one or more of the
     following rights and remedies (all of which shall be cumulative):

          (a)  Exercise all of the rights and remedies of a secured party under
     the Uniform Commercial Code.  The Bank may enter upon any of the premises
     of any Guarantor and may take physical possession of the Collateral or
     render the Collateral unusable by process of law or peaceably without
     process of law.  The Bank may, with only such demand, advertising or notice
     as may be required by law, sell and deliver any and all Collateral held by
     it for its account at any time or times in one or more private or public
     sales, for cash or credit or otherwise, at such price and upon such terms
     as the Bank deems advisable in its sole discretion; provided that such
     terms are commercially reasonable.  Notice of any public sale shall be
     sufficient if it describes the Collateral to be sold in general terms,
     stating the amounts thereof and the location and nature of the properties
     covered by the security interests and the prior liens thereon, and is
     published, at least once, not less than seven (7) days prior to the sale in
     any newspaper which the Bank may select which newspaper has a general
     circulation in the municipality where the Collateral is located or deemed
     located.  All requirements of reasonable notice shall be met if such notice
     is sent to the Guarantors, in the manner provided in Section 8.03 below, at
     least seven (7) days before the time of such sale or disposition.  The Bank
     may be the purchaser at any such sale, if it is public, free from any right
     of redemption.  The proceeds of sale shall be applied first to the costs of
     retaking, refurbishing, storing and selling any Collateral hereunder and to
     other costs of collection and other costs incurred by the Bank, and then to
     the payment of the Guaranteed Obligations and the other obligations secured
     hereby.

          (b)  Enforce the provisions of this Agreement by legal proceedings for
     the specific performance of any covenant or agreement contained herein or
     for the enforcement of any other appropriate legal or equitable remedy, and
     the Bank may recover damages caused by any breach by any Guarantor of the
     provisions of this Agreement, including court costs, reasonable attorneys'
     fees and other costs and expenses incurred in the enforcement of the
     obligations of the Guarantors hereunder.

          (c)  Exercise all rights and remedies hereunder, under the Loan
     Documents, and under any other agreement with the Bank, and exercise all
     other rights and remedies which the Bank may have under applicable law.

          Section 7.03.  Set-off.  In addition to any rights now or hereafter 
                         -------
     granted under applicable law and not by way of limitation of any such
     rights, upon the occurrence of any Event of Default and during the
     continuance thereof, the Bank is hereby authorized at any time or from time
     to time, without presentment, demand, protest or other notice of any kind
     to any Guarantor or to any other Person, all of which are hereby expressly
     waived, to set off and to appropriate and apply any and all deposits (other
     than designated payroll accounts) and any other Indebtedness at any time
     held or owing by the Bank or any affiliate of the Bank to or for the credit
     or the account of any Guarantor against and on account of the obligations
     and liabilities of such Guarantor to the Bank under this Agreement,
     irrespective of whether or not the Bank shall have made any demand for
     payment and although said obligations, liabilities or claims, or any of
     them, may then be contingent or unmatured and without regard for the
     availability or adequacy of other collateral.  Each Guarantor also grants
     to the Bank a security interest with respect to all its deposits and all
     securities or other property in the possession of the Bank or any affiliate
     of the Bank from time to time, and, upon the occurrence of any Event of
     Default, the Bank may exercise all rights and remedies of a secured party
     under the Uniform Commercial Code.

          Section 7.04.  Right to Cure.  In the event that any Guarantor shall 
                         -------------
     fail to pay any tax, assessment, governmental charge or levy, except as the
     same may be otherwise permitted hereunder, or in the event that any lien,
     encumbrance or security interest prohibited hereby shall not be paid in
     full or discharged, or in the event that any Guarantor shall fail to pay or
     comply with any other obligation hereunder, the Bank may, but shall not be
     required to, pay, satisfy, perform, discharge or bond the same for the
     account of the defaulting Guarantor, and all moneys so paid by the Bank
     shall be reimbursed by the Guarantors to the Bank on demand and shall bear
     interest from the date of demand until paid at the lesser of (i) a
     fluctuating rate per annum which shall at all times be equal to the sum of
     two and one-half (2-1/2%) percent per annum plus the Base Rate as in effect
     from time to time, or (ii) the maximum rate permitted by then applicable
     law.  The Bank will give each relevant Guarantor not less than 30 days'
     notice before acting under this Section, except that the Bank may act with
     less notice (or with no notice) in the case of emergency, as reasonably
     determined by the Bank.

                                     ARTICLE VIII

                                    MISCELLANEOUS

          Section 8.01.  No Waiver; Cumulative Remedies.  No failure or delay on
                         ------------------------------
     the part of any party in exercising any right, power or remedy hereunder
     shall operate as a waiver thereof, nor shall any single or partial exercise
     of any such right, power or remedy preclude any other or further exercise
     thereof or the exercise of any other right, power or remedy hereunder.  The
     remedies herein provided are cumulative and not exclusive of any remedies
     provided by law or otherwise available to the Bank.  Such remedies may be
     exercised without resort or regard to the other source of satisfaction of
     any liabilities of any Guarantor to the Bank.  The provisions of this
     Agreement are not limited by nor in the limitation of any additional or
     inconsistent provisions contained in the Loan Agreement or elsewhere.

          Section 8.02.  Amendments, Waivers and Consents.  Neither this 
                         --------------------------------
     Agreement nor any provision hereof may be amended, waived discharged or
     terminated orally.  Any such amendment, waiver, discharge or termination
     must be in writing signed by the party against whom enforcement of the
     amendment, waiver, discharge or termination is sought.  Any waiver or
     consent may be given subject to satisfaction of conditions stated therein
     and any waiver or consent shall be effective only in the specific instance
     and for the specific purpose for which given.

          Section 8.03.  Addresses for Notices, etc.  Except as otherwise 
                         ---------------------------
     expressly provided in this Agreement, all notices, requests, demands and
     other communications provided for hereunder shall be in writing and shall
     be mailed or delivered to the applicable party at the address indicated
     below:

          If to any Guarantor:

               c/o Medical Diagnostics, Inc.
               6 New England Executive Park
               Burlington, MA  01803
               Attention:  President

          with a copy to:

               Advanced NMR Systems, Inc.
               46 Jonspin Road
               Wilmington, MA  01887
               Attention:  Chairman

                         and

               Gerald J. Billow, Esq.
               Posternak, Blankstein & Lund
               100 Charles River Plaza
               Boston, MA  02114

          If to the Bank:

               Chemical Bank
               c/o Chemical Connecticut Corporation
               3 Landmark Square
               Stamford, CT  06901
               Attention:  David M. Nackley, Senior Vice President

     or, as to each of the foregoing, at such other address as shall be
     designated by such Person in a written notice to the other party complying
     as to delivery with the terms of this Section.  Except as otherwise
     provided herein, all such notices, requests, demands and other
     communications shall be deemed delivered on the earlier of (i) the date
     received or (ii) the date of delivery, refusal or non-delivery indicated on
     the return receipt if deposited in the United States mails, sent postage
     prepaid, registered or certified mail, return receipt requested, postage
     and registration or certification charges prepaid, addressed as aforesaid.

          Section 8.04.  Costs, Expenses and Taxes.  The Guarantors jointly and
                         -------------------------
     severally agree to pay on demand all costs and expenses (including, without
     limitation, reasonable legal fees) of the Bank in connection with the
     preparation, execution and delivery of this Agreement and all other
     instruments and documents to be delivered hereunder and any amendments or
     modifications of any of the foregoing, or in connection with the
     examination, review or administration of any of the foregoing, as well as
     the costs and expenses (including, without limitation, the reasonable fees
     and out-of-pocket expenses of legal counsel) incurred by the Bank in
     connection with preserving, enforcing or exercising any rights or remedies
     under this Agreement and all other instruments and documents to be
     delivered hereunder, all whether or not legal action is instituted.  In
     addition, the Guarantors shall be jointly and severally obligated to pay
     any and all stamp and other taxes payable or determined to be payable in
     connection with the execution and delivery of this Agreement and all other
     instruments and documents to be delivered hereunder, and the Guarantors
     jointly and severally agree to save the Bank harmless from and against any
     and all liabilities with respect to or resulting from any delay in paying
     or omission to pay such taxes.  Any fees, expenses or other charges which
     the Bank is entitled to receive from the Guarantors hereunder shall bear
     interest from the date of demand for payment until paid at the lesser of
     (i) a fluctuating rate per annum which shall at all times be equal to the
     sum of two and one-half (2-1/2%) percent per annum plus the Base Rate as in
     effect from time to time or (ii) the maximum rate permitted by then
     applicable law.

          Section 8.05.  Representations and Warranties.  All covenants, 
                         ------------------------------
     agreements, representations and warranties made herein or in any other
     document delivered by or on behalf of any Guarantor pursuant to or in
     connection with this Agreement are material and shall be deemed to have
     been relied upon by the Bank, notwithstanding any investigation heretofore
     or hereafter made by the Bank and shall survive the making of the Loans as
     contemplated in the Loan Agreement, and shall continue in full force and
     effect so long as any of the Guaranteed Obligations or other obligations
     secured hereby remain outstanding and unpaid.  All statements contained in
     any certificate or other paper delivered to the Bank at any time by or on
     behalf of any Guarantor pursuant hereto shall constitute representations
     and warranties by the Guarantors hereunder.

          Section 8.06.  Binding Effect; Assignment.  This Agreement shall be 
                         --------------------------
     binding upon the Guarantors and their respective successors and assigns and
     shall inure to the benefit of the Bank and its successors and assigns.  No
     Guarantor may assign this Agreement or any rights hereunder without the
     express written consent of the Bank.

          Section 8.07.  Reproduction of Agreement.  This Agreement and all 
                         -------------------------
     other instruments, documents and papers which relate thereto which have
     been or may be hereafter furnished to the Bank may be reproduced by the
     Bank by any photographic, photostatic, micro-card, miniature photographic,
     xerographic or similar process, and the Bank may destroy the original from
     which any document was so reproduced.  Any such reproduction shall be
     admissible in evidence as the original itself in any judicial or
     administrative proceeding (whether or not the original is in existence and
     whether or not such reproduction was made in the regular course of
     business).

          Section 8.08.  Consent to Jurisdiction.  Each Guarantor irrevocably 
                         -----------------------
     submits to the jurisdiction of any New York court or any federal court
     sitting within the Southern District of New York over any suit, action or
     proceeding arising out of or relating to this Agreement.  Each Guarantor
     irrevocably waives, to the fullest extent permitted by law, any objection
     which it may now or hereafter have to the laying of venue of any such suit,
     action or proceeding brought in such a court and any claim that any such
     suit, action or proceeding has been brought in an inconvenient forum.  Each
     Guarantor agrees that final judgment in any such suit, action or proceeding
     brought in such a court shall be enforced in any court of proper
     jurisdiction by a suit upon such judgment, provided that service of process
     in such action, suit or proceeding shall have been effected upon such
     Guarantor in one of the manners specified in the following paragraph of
     this Section 8.08 or as otherwise permitted by law.

          Each Guarantor hereby consents to process being served in any suit,
     action or proceeding of the nature referred to in the preceding paragraph
     of this Section 8.08 either (i) by mailing a copy thereof by registered or
     certified mail, postage prepaid, return receipt requested, to it at its
     address set forth in Section 8.03 or (ii) by serving a copy thereof upon it
     at its address set forth in Section 8.03.  Each Guarantor irrevocably
     waives, to the fullest extent permitted by law, all claims of error by
     reason of any service as contemplated herein and agrees that such service
     shall (x) be deemed in every respect effective service upon such Guarantor
     in any such suit, action or proceeding and (y) to the fullest extent
     permitted by law, be taken and held to be valid personal service upon and
     personal delivery to such Guarantor.

          Section 8.09.  Governing Law.  This Agreement shall be governed by, 
                         -------------
     and construed in accordance with, the laws of the State of New York.

          Section 8.10.  Severability.  In the event that any provision of this
                         ------------
     Agreement or the application thereof to any Person, property or
     circumstances shall be held to any extent to be invalid or unenforceable,
     the remainder of this Agreement and the application of such provision to
     Persons, properties or circumstances other than those as to which it has
     been held invalid or unenforceable shall not be affected thereby, and each
     provision of this Agreement shall be valid and enforceable to the fullest
     extent permitted by law.

          Section 8.11.  Headings.  Article and Section headings in this 
                         --------
     Agreement are included herein for convenience of reference only and shall
     not constitute a part of this Agreement for any other purpose.

          Section 8.12.  WAIVER OF TRAIL BY JURY.  EACH GUARANTOR HEREBY 
                         -----------------------
     EXPRESSLY KNOWINGLY AND VOLUNTARILY WAIVES ALL BENEFIT AND ADVANTAGE OF ANY
     RIGHT TO TRIAL BY JURY, AND AGREES THAT IT WILL NOT AT ANY TIME INSIST
     UPON, OR PLEAD OR IN ANY MANNER WHATSOEVER CLAIM OR TAKE THE BENEFIT OR
     ADVANTAGE OF, A TRIAL BY JURY IN ANY ACTION ARISING IN CONNECTION WITH THIS
     AGREEMENT OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREBY.

               IN WITNESS WHEREOF, each Guarantor has caused this Agreement to
     be executed by its duly authorized officer as of the day and year first
     above written.


                                   MRI ASSOCIATES, INC.

                                  
                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MDI INVESTMENTS, INC.

                                                       
                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   GREATER SPRINGFIELD MRI, INC.

                                                       
                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   GREATER BOSTON MRI SERVICES, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MOBILE MRI OF WESTERN MASS., INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   CENTRAL MASSACHUSETTS MRI SERVICES,
                                     INC.

                                                       
                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   CASCO BAY MR SERVICES, INC.

                                                       
                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MDI FINANCE AND LEASING, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MERRIMACK SCANNING, INC.

                                                                      
                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MIDDLESEX MRI CENTER, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MDI-NEW YORK, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MDI REHAB, INC.

                                                       
                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President

                                                       
                                   MERITUS HEALTH SYSTEMS, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   TECHNICIAN SERVICES, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MERITUS-SOUTHWESTERN VIRGINIA, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MERITUS-IOWA, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MERITUS WEST VIRGINIA, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MERITUS MRI, INC.
                                                       

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   MERITUS PLS, INC.
                                                    

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


                                   GREATER BOSTON MRI LIMITED
                                      PARTNERSHIP

                                   By MRI Associates, Inc., General Partner 
                                   duly authorized
                                        

                                   By: /s/ John A. Lynch
                                      --------------------------
                                      Name:  John A. Lynch
                                      Title:  President


     Accepted:

     CHEMICAL BANK


     By: /s/ Joseph Sacks
        --------------------------
        Name:  Joseph Sacks
        Title:  Vice President



                                                                EXHIBIT 10.5
                                                                
                                STOCK PLEDGE AGREEMENT

          STOCK PLEDGE AGREEMENT dated as of August 31, 1995 from Advanced NMR
     Systems, Inc., a Delaware corporation (the "Pledgor") to Chemical Bank (the
     "Pledgee").

          1.   PLEDGE.  The Pledgor hereby pledges and assigns to the Pledgee,
     and hereby grants a security interest to the Pledgee in, 1,250,000 shares
     of Common Stock, $0.01 par value, of Advanced Mammography Systems, Inc., a
     Delaware corporation (the "Company"), such shares (together with any other
     shares or property which hereafter is required to be pledged to the
     Pledgee) being herein called the "Collateral".  The Pledgor is
     simultaneously herewith delivering to the Pledgee certificates representing
     the initial Collateral, together with duly executed blank stock powers
     transferring same.

          2.   SECURITY.  This Agreement is made by the Pledgor with the Pledgee
     to secure the following (collectively, the "Secured Obligations"): (i) the
     obligations of the Pledgor under that certain Guaranty and Security
     Agreement of even date herewith (the "Guaranty Agreement") between the
     Pledgor and the Pledgee, and (ii) all of the other Guaranteed Obligations
     (as defined in the Guaranty Agreement), all of the foregoing whether now
     existing or hereafter arising.  Pursuant to the Guaranty Agreement, the
     Pledgor has guarantied to the Pledgee the payment and performance of the
     obligations of Medical Diagnostics, Inc. (the "Borrower") under the Loan
     and Security Agreement of even date herewith (the "Loan Agreement") between
     the Borrower and the Pledgee and the Notes issued thereunder.

          3.   REPRESENTATIONS, WARRANTIES AND COVENANTS.  The Pledgor
     represents, warrants and covenants that:  (a) the Collateral is validly
     issued, fully paid and non-assessable, and the Pledgor has good and valid
     title to the same, free and clear of any liens, charges or encumbrances
     thereon or affecting the title thereto, (b) the Pledgor has good right and
     lawful authority to pledge, assign, transfer, deliver, deposit, set over
     and confirm unto the Pledgee the Collateral as provided herein and will
     warrant and defend the title thereto and the lien thereon conveyed to the
     Pledgee by this Agreement against all claims of all persons and will
     maintain and preserve such lien, subject to the provisions of the
     Securities Act of 1933, as amended, (c) the execution, delivery and
     performance of this Agreement and the delivery of the Collateral to the
     Pledgee do not and will not contravene the charter documents or by-laws of
     the Pledgor or the Company or any agreement, commitment, indenture,
     contract or other obligation or restriction affecting the Company or the
     Pledgor or any of their respective properties, (d) this Agreement and the
     delivery of the Collateral to the Pledgee create in the Pledgee a fully
     perfected first security interest in the Collateral, and (e) this Agreement
     is the legal, valid and binding obligation of the Pledgor, enforceable in
     accordance with its terms.  The Pledgor covenants that the Pledgor will
     have the like title to and right to pledge any other property of the
     Pledgor at any time hereafter required to be pledged to the Pledgee
     hereunder, that the Pledgee will have a like security interest in such
     other property and that the Pledgor will likewise defend the Pledgee's
     rights and security interest therein.

          The Pledgor represents that at the date hereof 2,750,000 shares of the
     Common Stock of the Company (the "Escrowed Shares") are held by American
     Stock Transfer & Trust Company ("Escrow Agent") pursuant to an Escrow
     Agreement dated as of January 25, 1993 (the "Escrow Agreement") among the
     Escrow Agent, the Pledgor and the Company.  Pursuant to the Escrow
     Agreement, some or all of the Escrowed Shares may be released to the
     Pledgor from escrow from time to time upon the occurrence of certain events
     described in the Escrow Agreement.  The Pledgor agrees that within five
     days after any of the Escrowed Shares are so released to the Pledgor, the
     Pledgor will deliver to the Pledgee the certificates representing such
     released Escrowed Shares, together with appropriate stock transfer powers
     signed in blank, and all such released Escrowed Shares will be deemed
     included in the Collateral.

          4.   EVENTS OF DEFAULT.  As used herein, an "Event of Default" shall
     be deemed to have occurred upon the occurrence of any one or more of the
     following:  (a) any representation or warranty of the Pledgor made herein
     or made by the Pledgor and/or the Borrower in connection with any of the
     transactions contemplated by the Loan Agreement shall at any time prove to
     have been incorrect in any material respect when made; or (b) the Pledgor
     shall fail to perform any of its obligations under the last grammatical
     paragraph of Section 3 within the time period set forth therein; or (c) the
     Pledgor shall fail to perform, fulfill or observe any other covenant or
     agreement contained herein and such failure shall continue unremedied for
     ten (10) days after written notice thereof to the Pledgor; or (d) any
     material "Event of Default" (as defined in the Guaranty Agreement) (the
     Pledgor agreeing that "material Events of Default" include, without
     limitation, any monetary Events of Default) shall exist and be continuing;
     or (e) any other failure or default shall exist, beyond the expiration of
     any applicable notice and/or grace period, under any other Secured
     Obligation or any other agreement, understanding or undertaking, now
     existing or hereafter arising or entered into, which is given or made by
     the Pledgor and/or the Borrower to, with or for the benefit of the Pledgee.
     Unless and until an Event of Default shall have occurred and be continuing,
     the Pledgor shall be entitled to vote any and all shares of the Collateral
     and give consents, waivers and ratifications in respect thereof; PROVIDED,
     HOWEVER, that no vote shall be cast or consent, waiver or ratification
     given or action taken which would be inconsistent with any of the
     provisions hereof or of the Guaranty Agreement or which would involve any
     violation of any of such provisions.  All such rights of the Pledgor to
     vote and give consents, waivers and ratifications shall cease in case an
     Event of Default shall occur and be continuing and the Pledgee shall give
     the notice referred to in the following sentence.  At any time after the
     occurrence and continuance of an Event of Default, and upon written notice
     by the Pledgee of its intention to do so, the Pledgee may vote any or all
     shares of the Collateral (whether or not transferred as hereinafter
     provided) and give all consents, waivers and ratifications in respect
     thereof and otherwise act with respect thereto as though it were the
     outright owner thereof (the Pledgor hereby irrevocably constituting and
     appointing the Pledgee the proxy and attorney-in-fact of the Pledgor, with
     full power of substitution, so to do), and at any such time the Pledgee may
     transfer into the Pledgee's name, or into the name of the Pledgee's
     nominee, any or all shares of the Collateral.  The Pledgor hereby
     irrevocably constitutes and appoints the Pledgee the Pledgor's agent and
     attorney-in-fact, with full power of substitution, to execute (in the name
     and on behalf of the Pledgor) and deliver all stock transfer powers and
     other documents which the Pledgee may reasonably require in order to carry
     out the intent of this Section 4.  The Pledgee being a secured party with
     respect to the Collateral, the rights and powers conferred by this Section
     are expressly agreed to be coupled with an interest and, therefore,
     irrevocable.

          5.   DIVIDENDS.  Unless and until an Event of Default shall have
     occurred and be continuing, all cash dividends paid in respect of the
     Collateral may be received by the Pledgor; otherwise all dividends shall be
     paid to the Pledgee.

          6.   REMEDIES IN CASE OF AN EVENT OF DEFAULT.  In case an Event of
     Default shall have occurred and be continuing, the Pledgee shall have the
     right to exercise in respect of the Collateral all the rights and remedies
     available to a secured party under the Uniform Commercial Code in effect at
     the time in the State of New York.  The Pledgee may, upon ten (10) days'
     notice in writing to the Pledgor (the Pledgor agreeing that such notice
     shall be deemed to meet any requirement for reasonable notice), sell,
     assign and deliver the whole or, from time to time, any part of the
     Collateral, or any interest in any part thereof, at any private sale or at
     public auction, for cash, on credit or for other property, for immediate or
     future delivery, and for such price or prices and on such terms as the
     Pledgee in its uncontrolled discretion may determine, the Pledgor hereby
     waiving and releasing any and all right or equity of redemption whether
     before or after sale hereunder; at any such public auction the Pledgee may
     bid for and purchase the whole or any portion of the Collateral and may
     make payment therefor by any means.  The Pledgee shall apply the cash
     proceeds received by it from any sale or other disposition, together with
     any other moneys at the time held by it hereunder, to the reasonable
     expenses of retaking, holding, preparing for sale, selling and the like, to
     reasonable attorneys' fees, and all legal expenses, travel and other
     expenses which may be incurred by the Pledgee in collecting or attempting
     to collect any of the Secured Obligations or to enforce this Agreement or
     in the prosecution or defense of any action or proceeding related to the
     subject matter of this Agreement; and then to such sums in such order as to
     principal or interest remaining unpaid as the Pledgee in its sole
     discretion may reasonably determine, and any surplus shall be paid to the
     Pledgor.  The Pledgee shall not be required to resort to or marshall any
     present or future security for, or guaranties of, the Secured Obligations
     (including, but not limited to, this Agreement and the Collateral pledged
     hereunder), or to resort to any such security or guaranties in any
     particular order.  The Pledgee's remedies shall be cumulative with all
     other rights, however existing or arising, and may be exercised
     concurrently or separately.  Neither failure nor delay on the Pledgee's
     part to exercise any right, remedy, power or privilege provided for herein
     or by statute or at law or in equity shall operate as a waiver thereof, nor
     shall any single or partial exercise of any such right, remedy, power or
     privilege preclude any other further exercise thereof or the exercise of
     any other right, remedy, power or privilege.

          The Pledgor recognizes that the Pledgee may be unable to effect a
     public sale of the Collateral by reason of certain prohibitions contained
     in the Securities Act of 1933, as amended (the "Act"), but may be compelled
     to resort to one or more private sales thereof to a restricted group of
     purchasers who will be obligated to agree, among other things, to acquire
     such securities for their own account, for investment and not with a view
     to the distribution or resale thereof.  The Pledgor agrees that any such
     private sales may be at prices and on other terms less favorable to the
     seller than if sold at public sales and that such private sales shall not
     be deemed to have been made in a commercially unreasonable manner because
     they were private sales.  The Pledgee shall be under no obligation to delay
     a sale for the period of time necessary to permit the issuer of the
     securities to register such securities for public sale under the Act, even
     if the issuer would agree to do so.

          7.   PLEDGOR'S OBLIGATIONS NOT AFFECTED.  The obligations of the
     Pledgor under this Agreement shall remain in full force and effect without
     regard to, and shall not be impaired or affected by:  (a) any amendment or
     modification of or addition or supplement to the Guaranty Agreement, the
     Loan Agreement or any other instrument referred to therein or delivered in
     connection with any of the Loans (as defined in the Loan Agreement), or any
     assignment or transfer of any thereof; (b) any exercise or non-exercise by
     the Pledgee of any right, remedy, power or privilege under or in respect of
     this Agreement, the Guaranty Agreement, the Loan Agreement or any such
     other instrument or any Secured Obligation; (c) any waiver, consent,
     extension, indulgence or other action or inaction in respect of this
     Agreement, the Guaranty Agreement, the Loan Agreement or any such other
     instrument or any Secured Obligation; or (d) any bankruptcy, insolvency,
     reorganization, arrangement, readjustment, composition, liquidation, or the
     like, of the Pledgor, the Borrower and/or the Company; all whether or not
     the Pledgor shall have notice or knowledge of any of the foregoing.

          8.   TRANSFER BY THE PLEDGOR.  Without the prior written consent of
     the Pledgee, the Pledgor will not sell, assign, transfer or otherwise
     dispose of, grant any option with respect to, or mortgage, pledge or
     otherwise encumber any of, the Collateral or any interest therein, other
     than the pledge contained in this Agreement.

          9.   TERMINATION.  Upon the payment and performance of all of the
     Secured Obligations and the Loans and the termination of any and all
     commitments and credit facilities now or hereafter made available by the
     Pledgee to or for the benefit of the Pledgor and/or the Borrower, this
     Agreement shall terminate and such of the Collateral as has not theretofore
     been sold or otherwise applied pursuant to the provisions of this Agreement
     shall be delivered to the Pledgor.

          10.  NOTICE.  All notices and other communications hereunder shall be
     in writing and shall be given in the manner and to the addresses provided
     for in the Guaranty Agreement.  All such notices and communications shall
     be deemed delivered on the earlier of (i) the date received or (ii) the
     date of delivery refusal or non-delivery indicated on the return receipt if
     deposited in the United States mails, sent registered or certified mail,
     return receipt requested, postage and registration or certification charges
     prepaid, addressed as aforesaid.

          11.  FURTHER ASSURANCES.  The Pledgor will do all such acts, and will
     furnish to the Pledgee all such financing statements, certificates,
     opinions and other documents, and will do or cause to be done all such
     other things, as the Pledgee may reasonably request from time to time in
     order to give full effect to this Agreement and to secure the rights of the
     Pledgee hereunder.

          12.  PLEDGEE'S EXONERATION.  Under no circumstances shall the Pledgee
     be deemed to assume any responsibility for or obligation or duty with
     respect to any part or all of the Collateral beyond the safe custody
     thereof, and the same shall be at the Pledgor's sole risk at all times
     except as aforesaid.  The Pledgee shall not be required to take any action
     of any kind to collect, preserve or protect its or the Pledgor's rights in
     the Collateral or against any other parties.  The Pledgor hereby releases
     the Pledgee from any claims, causes of action and demands at any time
     arising out of or with respect to this Agreement, the use of the Collateral
     and/or any actions reasonably taken or omitted to be taken by the Pledgee
     with respect thereto, and the Pledgor hereby agrees to hold the Pledgee
     harmless from and with respect to any and all such claims, causes of action
     and demands.  The Pledgee's prior recourse to any part or all of the
     Collateral or to any other collateral or obligor shall not constitute a
     condition of any demand, suit or proceeding for payment or collection with
     respect to any of the Secured Obligations.

          13.  REORGANIZATIONS.  In the event of any one or more
     reclassifications, changes, exchanges, stock splits, stock dividends, stock
     consolidations or other subdivisions or combinations of the shares of the
     capital stock of the Company or any immediate or remote successor to
     substantially all of the business or assets of the Company pursuant to any
     one or more of the events described in this sentence, or consolidations of
     the Company or any such successor into other corporations, or other
     recapitalizations or reorganizations affecting the Company or any such
     successor, or any one or more sales or conveyances to another corporation
     of the property of the Company or any such successor as an entirety or
     substantially as an entirety (each, a "Reorganization"), the Pledgor will
     deliver to the Pledgee, in readily transferable form, all securities and
     property which come to the Pledgor with respect to the Collateral as a
     result of that and any subsequent Reorganization, except for securities and
     property surrendered or cancelled pursuant to any of same, and such
     securities and property shall thereupon become and constitute all or part
     of the Collateral, as the case may be.  All sums of money and property paid
     or distributed in respect of the Collateral which are received by the
     Pledgor pursuant to a Reorganization shall, until paid or delivered to the
     Pledgee, be held in trust for the Pledgee to secure the payment and the due
     performance of and compliance with the Secured Obligations.

          14.  MISCELLANEOUS.  Neither this Agreement nor any provisions hereof
     may be amended, modified, waived, discharged or terminated orally, but only
     by an instrument in writing signed by the party against whom enforcement of
     the amendment, modification, waiver, discharge or termination is sought. 
     The provisions of this Agreement shall inure to the benefit of the
     successors and assigns of the Pledgee, and shall be binding upon the
     successors and assigns of the Pledgor.  The captions in this Agreement are
     for convenience of reference only and shall not define or limit the
     provisions hereof.  This Agreement shall be construed and enforced in
     accordance with the laws of New York.  This Agreement may be executed
     simultaneously in several counterparts, each of which will be deemed an
     original, but all of which together shall constitute one instrument.  If
     any term or provision of this Agreement or the application thereof to any
     person, property or circumstance shall to any extent be invalid or
     unenforceable, the remainder of this Agreement and the application of such
     term or provision to persons, properties and circumstances other than those
     as to which it is invalid or unenforceable shall not be affected thereby,
     and each term and provision of this Agreement shall be valid and enforced
     to the fullest extent permitted by law.

          IN WITNESS WHEREOF, the Pledgor and the Pledgee have caused this
     Agreement to be duly executed, as an instrument under seal, as of the day
     and year first above written.



                                          PLEDGOR:
                                          ADVANCED NMR SYSTEMS, INC.



                                          By /s/ Jack Nelson
                                            -----------------------------
                                            Its  Chairman


                                          PLEDGEE:
                                          CHEMICAL BANK



                                          By /s/ Joseph Sacks
                                             ----------------------------
                                             Its  Vice President




                                                                EXHIBIT 10.6


                                STOCK PLEDGE AGREEMENT

               STOCK PLEDGE AGREEMENT dated as of August 31, 1995 from
          Medical Diagnostics, Inc., a Delaware corporation (the "Pledgor")
          to Chemical Bank (the "Pledgee").

              1.    PLEDGE.  The Pledgor hereby pledges and assigns to the
          Pledgee, and hereby grants a security interest to the Pledgee in
          the shares of Pledgor's subsidiaries (the "Subsidiaries") listed
          on Schedule A hereto, such shares (together with any other shares
          or property which hereafter is required to be pledged to the
          Pledgee) being herein called the "Collateral".  The Pledgor is
          simultaneously herewith delivering to the Pledgee certificates
          representing the Collateral, together with duly executed blank
          stock powers transferring same.

              2.    SECURITY.  This Agreement is made by the Pledgor with
          the Pledgee to secure the following (collectively, the "Secured
          Obligations"): (i) the obligations of the Pledgor under that
          certain Loan and Security Agreement of even date herewith (the
          "Loan Agreement") between the Pledgor and the Pledgee, (ii) the
          $9,000,000 promissory note of even date herewith (the "Term
          Note") made by the Pledgor and payable to the order of the
          Pledgee, (iii) the $6,000,000 promissory note of even date
          herewith (the "Revolving Note") made by the Pledgor and payable
          to the order of the Pledgee, and (iv) all of the other
          Obligations (as defined in the Loan Agreement), all of the
          foregoing whether now existing or hereafter arising.

              3.    REPRESENTATIONS, WARRANTIES AND COVENANTS.  The Pledgor
          represents, warrants and covenants that:  (a) the Collateral is
          validly issued, fully paid and non-assessable, and the Pledgor
          has good and valid title to the same, free and clear of any
          liens, charges or encumbrances thereon or affecting the title
          thereto, (b) the Pledgor has good right and lawful authority to
          pledge, assign, transfer, deliver, deposit, set over and confirm
          unto the Pledgee the Collateral as provided herein and will
          warrant and defend the title thereto and the lien thereon
          conveyed to the Pledgee by this Agreement against all claims of
          all persons and will maintain and preserve such lien, (c) the
          execution, delivery and performance of this Agreement and the
          delivery of the Collateral to the Pledgee do not and will not
          contravene the charter documents or by-laws of the Pledgor or any
          of the Subsidiaries or any agreement, commitment, indenture,
          contract or other obligation or restriction affecting any of the
          Subsidiaries or the Pledgor or any of their respective
          properties, (d) this Agreement and the delivery of the Collateral
          to the Pledgee create in the Pledgee a fully perfected first
          security interest in the Collateral, (e) the Pledgor owns and
          will at all times own 100% of each class of outstanding equity
          securities of each of the Subsidiaries and the Collateral
          constitutes and will at all times continue to constitute 100% of
          each class of outstanding equity securities of each of the
          Subsidiaries, and (f) this Agreement is the legal, valid and
          binding obligation of the Pledgor, enforceable in accordance with
          its terms.  The Pledgor covenants that the Pledgor will have the
          like title to and right to pledge any other property of the
          Pledgor at any time hereafter required to be pledged to the
          Pledgee hereunder, that the Pledgee will have a like security
          interest in such other property and that the Pledgor will
          likewise defend the Pledgee's rights and security interest
          therein.

              4.    EVENTS OF DEFAULT.  As used herein, an "Event of
          Default" shall be deemed to have occurred upon the occurrence of
          any one or more of the following:  (a) any representation or
          warranty of the Pledgor made herein or made by the Pledgor and/or
          any of the Subsidiaries in connection with any of the
          transactions contemplated by the Loan Agreement shall at any time
          prove to have been incorrect in any material respect when made;
          or (b) the Pledgor shall fail to perform, fulfill or observe any
          covenant or agreement contained herein and such failure shall
          continue unremedied for ten (10) days after written notice
          thereof to the Pledgor; or (c) any material "Event of Default"
          (as defined in the Loan Agreement) (the Pledgor agreeing that
          "material Events of Default" include, without limitation, any
          monetary Events of Default) shall exist; or (d) any other failure
          or default shall exist and be continuing, beyond the expiration
          of any applicable notice and/or grace period, under any other
          Secured Obligation or any other agreement, understanding or
          undertaking, now existing or hereafter arising or entered into,
          which is given or made by the Pledgor and/or the Company to, with
          or for the benefit of the Pledgee; or (e) the Collateral pledged
          hereunder in which the Pledgee has a fully perfected first
          priority security interest shall for any reason not constitute
          100% of each of the outstanding shares of each class of equity
          securities of the Subsidiaries.  Unless and until an Event of
          Default shall have occurred and be continuing, the Pledgor shall
          be entitled to vote any and all shares of the Collateral and give
          consents, waivers and ratifications in respect thereof; PROVIDED,
          HOWEVER, that no vote shall be cast or consent, waiver or
          ratification given or action taken which would be inconsistent
          with any of the provisions hereof or of the Loan Agreement or
          which would involve any violation of any of such provisions.  All
          such rights of the Pledgor to vote and give consents, waivers and
          ratifications shall cease in case an Event of Default shall occur
          and be continuing and the Pledgee shall give the notice referred
          to in the following sentence.  At any time after the occurrence
          and continuance of an Event of Default, and upon written notice
          by the Pledgee of its intention to do so, the Pledgee may vote
          any or all shares of the Collateral (whether or not transferred
          as hereinafter provided) and give all consents, waivers and
          ratifications in respect thereof and otherwise act with respect
          thereto as though it were the outright owner thereof (the Pledgor
          hereby irrevocably constituting and appointing the Pledgee the
          proxy and attorney-in-fact of the Pledgor, with full power of
          substitution, so to do), and at any such time the Pledgee may
          transfer into the Pledgee's name, or into the name of the
          Pledgee's nominee, any or all shares of the Collateral.  The
          Pledgor hereby irrevocably constitutes and appoints the Pledgee
          the Pledgor's agent and attorney-in-fact, with full power of
          substitution, to execute (in the name and on behalf of the
          Pledgor) and deliver all stock transfer powers and other
          documents which the Pledgee may reasonably require in order to
          carry out the intent of this Section 4.  The Pledgee being a
          secured party with respect to the Collateral, the rights and
          powers conferred by this Section are expressly agreed to be
          coupled with an interest and, therefore, irrevocable.

              5.    DIVIDENDS.  Unless and until an Event of Default shall
          have occurred and be continuing, all cash dividends paid in
          respect of the Collateral may be received by the Pledgor;
          otherwise all dividends shall be paid to the Pledgee.  Nothing
          contained herein, however, will be deemed to authorize the
          payment of any dividends except to such extent (if any) as may be
          expressly authorized and permitted under the Loan Agreement.

              6.    REMEDIES IN CASE OF AN EVENT OF DEFAULT.  In case an
          Event of Default shall have occurred and be continuing, the
          Pledgee shall have the right to exercise in respect of the
          Collateral all the rights and remedies available to a secured
          party under the Uniform Commercial Code in effect at the time in
          the State of New York.  The Pledgee may, upon ten (10) days'
          notice in writing to the Pledgor (the Pledgor agreeing that such
          notice shall be deemed to meet any requirement for reasonable
          notice), sell, assign and deliver the whole or, from time to
          time, any part of the Collateral, or any interest in any part
          thereof, at any private sale or at public auction, for cash, on
          credit or for other property, for immediate or future delivery,
          and for such price or prices and on such terms as the Pledgee in
          its uncontrolled discretion may determine, the Pledgor hereby
          waiving and releasing any and all right or equity of redemption
          whether before or after sale hereunder; at any such public
          auction the Pledgee may bid for and purchase the whole or any
          portion of the Collateral and may make payment therefor by any
          means.  The Pledgee shall apply the cash proceeds received by it
          from any sale or other disposition, together with any other
          moneys at the time held by it hereunder, to the reasonable
          expenses of retaking, holding, preparing for sale, selling and
          the like, to reasonable attorneys' fees, and all legal expenses,
          travel expenses and other expenses which may be incurred by the
          Pledgee in collecting or attempting to collect any of the Secured
          Obligations or to enforce this Agreement or in the prosecution or
          defense of any action or proceeding related to the subject matter
          of this Agreement; and then to such sums in such order as to
          principal or interest remaining unpaid as the Pledgee in its sole
          discretion may reasonably determine, and any surplus shall be
          paid to the Pledgor.  The Pledgee shall not be required to resort
          to or marshall any present or future security for, or guaranties
          of, the Secured Obligations (including, but not limited to, this
          Agreement and the Collateral pledged hereunder), or to resort to
          any such security or guaranties in any particular order.  The
          Pledgee's remedies shall be cumulative with all other rights,
          however existing or arising, and may be exercised concurrently or
          separately.  Neither failure nor delay on the Pledgee's part to
          exercise any right, remedy, power or privilege provided for
          herein or by statute or at law or in equity shall operate as a
          waiver thereof, nor shall any single or partial exercise of any
          such right, remedy, power or privilege preclude any other further
          exercise thereof or the exercise of any other right, remedy,
          power or privilege.

               The Pledgor recognizes that the Pledgee may be unable to
          effect a public sale of the Collateral by reason of certain
          prohibitions contained in the Securities Act of 1933, as amended
          (the "Act"), but may be compelled to resort to one or more
          private sales thereof to a restricted group of purchasers who
          will be obligated to agree, among other things, to acquire such
          securities for their own account, for investment and not with a
          view to the distribution or resale thereof.  The Pledgor agrees
          that any such private sales may be at prices and on other terms
          less favorable to the seller than if sold at public sales and
          that such private sales shall not be deemed to have been made in
          a commercially unreasonable manner because they were private
          sales.  The Pledgee shall be under no obligation to delay a sale
          for the period of time necessary to permit the issuer of the
          securities to register such securities for public sale under the
          Act, even if the issuer would agree to do so.

              7.    PLEDGOR'S OBLIGATIONS NOT AFFECTED.  The obligations of
          the Pledgor under this Agreement shall remain in full force and
          effect without regard to, and shall not be impaired or affected
          by:  (a) any amendment or modification of or addition or
          supplement to the Loan Agreement, the Term Note, the Revolving
          Note or any other instrument referred to therein or delivered in
          connection with any of the Loans (as defined in the Loan
          Agreement), or any assignment or transfer of any thereof; (b) any
          exercise or non-exercise by the Pledgee of any right, remedy,
          power or privilege under or in respect of this Agreement, the
          Loan Agreement, the Term Note, the Revolving Note or any such
          other instrument or any Secured Obligation; (c) any waiver,
          consent, extension, indulgence or other action or inaction in
          respect of this Agreement, the Loan Agreement, the Term Note, the
          Revolving Note or any such other instrument or any Secured
          Obligation; or (d) any bankruptcy, insolvency, reorganization,
          arrangement, readjustment, composition, liquidation, or the like,
          of the Pledgor and/or the Company; all whether or not the Pledgor
          shall have notice or knowledge of any of the foregoing.

              8.    TRANSFER BY THE PLEDGOR.  Without the prior written
          consent of the Pledgee, the Pledgor will not sell, assign,
          transfer or otherwise dispose of, grant any option with respect
          to, or mortgage, pledge or otherwise encumber any of, the
          Collateral or any interest therein, other than the pledge
          contained in this Agreement.

              9.    TERMINATION.  Upon the payment and performance of all
          Secured Obligations and the termination of any and all
          commitments and credit facilities now or hereafter made available
          by the Pledgee to or for the benefit of the Pledgor, this
          Agreement shall terminate and such of the Collateral as has not
          theretofore been sold or otherwise applied pursuant to the
          provisions of this Agreement shall be delivered to the Pledgor.

             10.    NOTICE.  All notices and other communications hereunder
          shall be in writing and shall be given in the manner and to the
          addresses provided for in the Loan Agreement.  All such notices
          and communications shall be deemed sufficiently given when
          delivered on the earlier of (i) the date received or (ii) the
          date of delivery refusal or non-delivery indicated on the return
          receipt if deposited in the United States mails, sent registered
          or certified mail, return receipt requested, postage and
          registration or certification charges prepaid, addressed as
          aforesaid.

             11.    FURTHER ASSURANCES.  The Pledgor will do all such acts,
          and will furnish to the Pledgee all such financing statements,
          certificates, opinions and other documents, and will do or cause
          to be done all such other things, as the Pledgee may reasonably
          request from time to time in order to give full effect to this
          Agreement and to secure the rights of the Pledgee hereunder.

             12.    PLEDGEE'S EXONERATION.  Under no circumstances shall
          the Pledgee be deemed to assume any responsibility for or
          obligation or duty with respect to any part or all of the
          Collateral beyond the safe custody thereof, and the same shall be
          at the Pledgor's sole risk at all times except as aforesaid.  The
          Pledgee shall not be required to take any action of any kind to
          collect, preserve or protect its or the Pledgor's rights in the
          Collateral or against any other parties.  The Pledgor hereby
          releases the Pledgee from any claims, causes of action and
          demands at any time arising out of or with respect to this
          Agreement, the use of the Collateral and/or any actions
          reasonably taken or omitted to be taken by the Pledgee with
          respect thereto, and the Pledgor hereby agrees to hold the
          Pledgee harmless from and with respect to any and all such
          claims, causes of action and demands.  The Pledgee's prior
          recourse to any part or all of the Collateral or to any other
          collateral or obligor shall not constitute a condition of any
          demand, suit or proceeding for payment or collection with respect
          to any of the Secured Obligations.

             13.    REORGANIZATIONS.  In the event of any one or more
          reclassifications, changes, exchanges, stock splits, stock
          dividends, stock consolidations or other subdivisions or
          combinations of the shares of the capital stock of any of the
          Subsidiaries or any immediate or remote successor to
          substantially all of the business or assets of any of the
          Subsidiaries pursuant to any one or more of the events described
          in this sentence, or consolidations of any of the Subsidiaries or
          any such successor of any of the Subsidiaries into other
          corporations, or other recapitalizations or reorganizations
          affecting any of the Subsidiaries or any such successor of any of
          the Subsidiaries, or any one or more sales or conveyances to
          another corporation of the property of any of the Subsidiaries or
          any such successor of any of the Subsidiaries as an entirety or
          substantially as an entirety (each, a "Reorganization"), the
          Pledgor will deliver to the Pledgee, in readily transferable
          form, all securities and property which come to the Pledgor with
          respect to the Collateral as a result of that and any subsequent
          Reorganization, except for securities and property surrendered or
          cancelled pursuant to any of same, and such securities and
          property shall thereupon become and constitute all or part of the
          Collateral, as the case may be.  All sums of money and property
          paid or distributed in respect of the Collateral which are
          received by the Pledgor pursuant to a Reorganization shall, until
          paid or delivered to the Pledgee, be held in trust for the
          Pledgee to secure the payment and the due performance of and
          compliance with the Secured Obligations.  Any and all shares of
          any class of equity securities of any of the Subsidiaries which
          may be issued or sold after the date hereof shall be deemed
          further Collateral hereunder and the certificates representing
          same shall be delivered to the Pledgee in readily transferable
          form to be held and dealt with pursuant to this Agreement.

             14.    MISCELLANEOUS.  Neither this Agreement nor any
          provisions hereof may be amended, modified, waived, discharged or
          terminated orally, but only by an instrument in writing signed by
          the party against whom enforcement of the amendment,
          modification, waiver, discharge or termination is sought.  The
          provisions of this Agreement shall inure to the benefit of the
          successors and assigns of the Pledgee, and shall be binding upon
          the successors and assigns of the Pledgor.  The captions in this
          Agreement are for convenience of reference only and shall not
          define or limit the provisions hereof.  This Agreement shall be
          construed and enforced in accordance with the laws of New York. 
          This Agreement may be executed simultaneously in several
          counterparts, each of which will be deemed an original, but all
          of which together shall constitute one instrument.  If any term
          or provision of this Agreement or the application thereof to any
          person, property or circumstance shall to any extent be invalid
          or unenforceable, the remainder of this Agreement and the
          application of such term or provision to persons, properties and
          circumstances other than those as to which it is invalid or
          unenforceable shall not be affected thereby, and each term and
          provision of this Agreement shall be valid and enforced to the
          fullest extent permitted by law.

               IN WITNESS WHEREOF, the Pledgor and the Pledgee have caused
          this Agreement to be duly executed, as an instrument under seal,
          as of the day and year first above written.


                                          PLEDGOR:
                                          MEDICAL DIAGNOSTICS, INC.


                                          By /s/ John A. Lynch
                                             ------------------------
                                             Its  President


                                          PLEDGEE:
                                          CHEMICAL BANK


                                          By /s/ Joseph Sacks
                                             ------------------------
                                             Its  Vice President

          <PAGE>

                                      SCHEDULE A
                                      ----------

                                      COLLATERAL


                                         Number of    Class of  Par Value
                       Entity             Shares       Shares   of Shares
                       ------            --------     -------- ----------

          MRI Associates, Inc.              100       Common       Zero


          MDI Investments, Inc.             100       Common       Zero

          Greater Boston MRI Services,      100       Common       Zero
          Inc.

          Central Massachusetts MRI         100       Common       Zero
          Services, Inc.

          Casco Bay MR Services, Inc.       100       Common       Zero

          MDI Finance and Leasing, Inc.     100       Common       Zero

          Merrimack Scanning, Inc.          100       Common       Zero

          Middlesex MRI Center, Inc.        100       Common       Zero

          MDI-New York, Inc.                100       Common       Zero

          MDI Rehab, Inc.                   100       Common       Zero

          Meritus Health Systems, Inc.      730       Common       Zero

          Technician Services, Inc.       7,300       Common       $1.00

          Meritus-Southwestern              730       Common       Zero
          Virginia, Inc.

          Meritus-Iowa, Inc.                730       Common       Zero

          Meritus West Virginia, Inc.       730       Common       Zero

          Meritus MRI, Inc.                 730       Common       Zero

          Meritus PLS, Inc.                 730       Common       Zero




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