ADVANCED NMR SYSTEMS INC
8-K/A, 1995-10-23
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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     =========================================================================
       

                          SECURITIES AND EXCHANGE COMMISSION

                                Washington, D.C. 20549


                                      Form 8-K/A


                                    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>

                                   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:  October 20, 1995

     <PAGE>

                                    EXHIBIT INDEX



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

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




                                                            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)  As used herein, the term "Determination Date" means the last day
     of each fiscal quarter of the Borrower, commencing with September 30, 1995.
     The Borrower will maintain a Debt Service Coverage Ratio, determined as at
     each Determination Date for the Measurement Period then ended, of not less
     than the following:  not less than 1.0 to 1 as at September 30, 1995; not
     less than 1.1 to 1 as at each of December 31, 1995, March 31, 1996,
     June 30, 1996, September 30, 1996, December 31, 1996 and March 31, 1997;
     and not less than 1.2 to 1 as at June 30, 1997 and as at each Determination
     Date thereafter.  As used herein, the "Debt Service Coverage Ratio" as
     determined as at any Determination Date means the ratio of (x) EBITDA
     Available for Debt Service for the Measurement Period then ended to (y) the
     result of:  (i) all interest on any Indebtedness, which interest was paid
     or payable or accrued by the Borrower or any Subsidiary of the Borrower
     during such Measurement Period, plus (ii) the aggregate amount of Current
                                     ----
     Maturities of the Borrower and Subsidiaries outstanding at such
     Determination Date (or 25% of such aggregate amount of Current Maturities
     if the relevant Measurement Period is three months, 50% of such aggregate
     amount of Current Maturities if the relevant Measurement Period is six
     months or 75% of such aggregate amount of Current Maturities if the
     relevant Measurement Period is nine months); but excluding from the
     interest expense and Current Maturities (if any) relating to Mass. Mobile
     Imaging Venture, MVA Rehabilitation Associates and Greater Springfield MRI
     Limited Partnership a pro rata share of same reflecting the minority
                           --- ----
     interests in each such entity which interests are not owned, directly or
     indirectly, by the Borrower.  As used herein, the term "Measurement Period"
     means the following:  the Measurement Period ending September 30, 1995 is
     the six-month period ending on that date, the Measurement Period ending
     December 31, 1995 is the nine-month period ending on that date; the
     Measurement Period ending March 31, 1996 and on each subsequent
     Determination Date is the rolling 12-month period ending on each such date.

          (l)  The Borrower will maintain an Interest Coverage Ratio, determined
     as at each Determination Date for the Measurement Period then ended, of not
     less than the following: not less than 2.0 to 1 as at each of September 30,
     1995, December 31, 1995, March 31, 1996, June 30, 1996, September 30, 1996
     and December 31, 1996; and not less than 3.0 to 1 as at March 31, 1997 and
     as at each Determination Date thereafter.  As used herein, the "Interest
     Coverage Ratio" determined as at any Determination Date means the ratio of
     (x) the consolidated EBIT of the Borrower and Subsidiaries for the
     Measurement Period then ended to (y) the total amount of all interest on
     Indebtedness, which interest was paid or payable or accrued by the Borrower
     or any Subsidiary of the Borrower during such Measurement Period.

          (m)  The Borrower will maintain at all times a Capital Base of not
     less than the then-applicable Minimum Capital Base Requirement.  The
     Minimum Capital Base Requirement will be deemed to be negative $5,250,000
     as at the date hereof and will be deemed to remain at that level through
     and including December 30, 1995.  The Minimum Capital Base Requirement will
     be deemed increased by $600,000 on each of December 31, 1995, March 31,
     1996, June 30, 1996 and September 30, 1996 and will be deemed further
     increased so that it will be equal to positive $1,750,000 on September 30,
     1997 (each such increase to remain in effect until the next increase is
     effective).  On September 30, 1998 and at all times thereafter, the Minimum
     Capital Base Requirement will be deemed to be positive $6,000,000.

          (n)  The Borrower will maintain at all times a Net Working Capital of
     not less than the following:  not less than $1,100,000 on September 30,
     1995 and at all times thereafter to (but not including) September 30, 1996;
     not less than $1,500,000 on September 30, 1996 and at all times thereafter
     to (but not including) September 30, 1997; not less than $3,500,000 on
     September 30, 1997 and at all times thereafter to (but not including)
     September 30, 1998; and not less than $5,800,000 on September 30, 1998 and
     at all times thereafter.

          (o)  For each fiscal year, the Borrower and its Subsidiaries will
     achieve an annual consolidated Adjusted Net Income of at least $1.00.  In
     addition, and without limitation of the foregoing, the Borrower and its
     Subsidiaries will not fail to achieve a quarterly consolidated Adjusted Net
     Income of at least $1.00 for any two consecutive fiscal quarters.  Further,
     and without limitation of the foregoing, the Borrower shall have sufficient
     Adjusted Net Income for each fiscal year so that the consolidated Adjusted
     Net Income of Advanced NMR and Subsidiaries (including the Borrower) will
     not be less than $1.00 for each fiscal year.  As used herein, "Adjusted Net
     Income" of the relevant Person for any period means the sum of: (1) the Net
     Income (or Net Loss, expressed as a negative number) of such Person for
     such period, plus (2) the amount, if any, representing amortization of
                  ----
     goodwill arising from the Merger which was actually deducted on the books
     of the Borrower in computing the Borrower's Net Income (or 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 books of the Borrower in computing the Borrower's
     Net Income (or Net Loss, as the case may be) for the relevant period.

          (p)  The Borrower will maintain at all times sufficient Tangible Net
     Worth so that the consolidated Tangible Net Worth of Advanced NMR and
     Subsidiaries (including the Borrower) 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.

          (q)  The Borrower will maintain at all times sufficient Current Assets
     so that the ratio of (x) consolidated Current Assets of Advanced NMR and
     Subsidiaries (including the Borrower) to (y) consolidated Current
     Liabilities of Advanced NMR and Subsidiaries (including the Borrower) will
     never be less than 1.2 to 1.

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

          (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)   up to $3,000,000 now or hereafter owed by MVA Rehabilitation
          Associates for working capital financing provided by the Borrower for
          said MVA Rehabilitation Associates;

           (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)   loans and/or capital contributions aggregating up to
          $3,000,000 made or to be made by the Borrower to MVA Rehabilitation
          Associates for working capital purposes (including, without
          limitation, for the purpose of funding start-up costs for new centers
          to be opened by MVA Rehabilitation Associates); provided that at the
          date of each such loan or capital contribution (each, an "Investment
          Date") MVA Rehabilitation Associates' then open and operational
          centers will have achieved positive net income for the Relevant Fiscal
          Period ended most recently prior to the Investment Date;

            (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)  The Borrower will not incur aggregate Capital Expenditures in any
     fiscal year in excess of the CapEx Limit.  As used herein, subject to the
     last sentence of this Subsection 7.02(t), "CapEx Limit" means:  $1,500,000
     for the fiscal year ending September 30, 1995; $1,100,000 for the fiscal
     year ending September 30, 1996; and $1,800,000 for the fiscal year ending
     September 30, 1997.  If the Borrower incurs in any fiscal year aggregate
     Capital Expenditures in an amount which is less than the full amount of the
     CapEx Limit for such fiscal year, then the amount by which such CapEx Limit
     for such fiscal year exceeds said aggregate Capital Expenditures for such
     fiscal year may be carried forward and added by the Borrower to the CapEx
     Limit for any subsequent fiscal year or years; provided that, in any event,
     at the time of the making of such Capital Expenditures in such subsequent
     fiscal year or years and after giving effect thereto there is no Event of
     Default under this Agreement nor would such additional Capital Expenditures
     lead to an Event of Default under this Agreement.

          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)  Any default shall exist and shall remain unwaived or uncured
     beyond the expiration of any applicable notice and/or grace period with
     respect to any Indebtedness of the Borrower or any of its Subsidiaries or
     any Guarantor in a principal amount equal to or greater than $100,000, or
     any such Indebtedness of $100,000 or more shall not have been paid when
     due, whether by acceleration or otherwise, and shall remain unpaid beyond
     the expiration of any applicable notice and/or grace period or shall have
     been declared to be due and payable prior to its stated maturity; 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)  Any final judgment (i.e., a judgment which has become final by
                                   ---
     the expiration of any applicable appeal period without appeal having been
     taken or, if such appeal has been taken, such judgment has been upheld on
     appeal) in an amount of $500,000 or more shall be issued or levied against
     the Borrower or any Subsidiary of the Borrower or any Guarantor and such
     judgment shall not be paid, vacated or fully bonded within 60 days after
     its issue or levy; 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: Joseph Sacks
                                           ----------------------
                                           Its  Vice President


     <PAGE>


                                       EXHIBITS
                                       --------


     Exhibit A  -   List of Guaranteeing Subsidiaries


     Exhibit B  -   Form of Revolving Note


     Exhibit C  -   Form of Term Note


     Exhibit D  -   Equipment subject to Fleet Lease; other equipment excepted
                    from Collateral


     Exhibit E  -   Intellectual Property


     Exhibit F  -   Subsidiaries, joint ventures


     Exhibit G  -   Litigation schedule


     Exhibit H  -   Violations of contracts, etc.


     Exhibit I  -   Determinations of Need; physician notices of intent


     Exhibit J      Employee benefit plans


     Exhibit K  -   Premises; Collateral locations; Record owners; titled
                    vehicles


     Exhibit L  -   Existing Indebtedness and existing liens


     Exhibit M  -   Existing Guaranties


     Exhibit N  -   Investment Policy Guidelines


     Exhibit O  -   Existing investments in and loans to Subsidiaries, joint
                    ventures


     Exhibit P  -   Officers and Directors



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