TREX MEDICAL CORP
S-1/A, 1997-01-07
X-RAY APPARATUS & TUBES & RELATED IRRADIATION APPARATUS
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    As filed with the Securities and Exchange Commission onJanuary 7, 1997
                                                 Registration No. 333-18781
    -----------------------------------------------------------------------
        

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                          -----------------------------

                               AMENDMENT NO. 1 TO
                                    FORM S-1
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                          -----------------------------
                            TREX MEDICAL CORPORATION
             (Exact name of registrant as specified in its charter)

                          -----------------------------

               Delaware                3844              06-1439626

           (State or other      (Primary Standard     (I.R.S. Employer
           jurisdiction of         Industrial          Identification
           incorporation or    Classification Code        Number)
            organization)            Number)

                36 Apple Ridge Road, Danbury, Connecticut 06810
                                 (203) 790-1188
         (Address, including zip code, and telephone number, including 
            area code, of registrant's principal executive offices) 

                          -----------------------------
                          SANDRA L. LAMBERT, SECRETARY 
                            TREX MEDICAL CORPORATION 
                        C/O THERMO ELECTRON CORPORATION 
                                81 Wyman Street 
                              Post Office Box 9046 
                       Waltham, Massachusetts 02254-9046 
                                 (617) 622-1000
           (Name, address, including zip code, and telephone number, 
                   including area code, of agent for service) 

                          -----------------------------
                                    Copy to: 
                           SETH H. HOOGASIAN, ESQUIRE
                                 GENERAL COUNSEL
                            TREX MEDICAL CORPORATION
                         C/O THERMO ELECTRON CORPORATION
                                 81 Wyman Street
                              Post Office Box 9046
                        Waltham, Massachusetts 02254-9046
                                 (617) 622-1000

                          -----------------------------

         Approximate date of commencement of proposed sale to the public: As
    soon as practicable after this Registration Statement has become
    effective.
PAGE
<PAGE>





      If any of the securities being registered on this form are to be
    offered on a delayed or continuous basis pursuant to Rule 415 under the
    Securities Act of 1933, check the following box.  [X]

      If this form is filed to register additional securities for an
    offering pursuant to Rule 462(b) under the Securities Act of 1933, check
    the following box and list the Securities Act registration statement
    number of the earlier effective registration statement for the same
    offering.  [ ]

      If this form is a post-effective amendment filed pursuant to Rule
    462(c) under the Securities Act of 1933, check the following box and list
    the Securities Act registration statement number of the earlier effective
    registration statement for the same offering. [ ]

      If delivery of the prospectus is expected to be made pursuant to Rule
    434, check the following box. [ ]

       
        

    -----------------------------

      The Registrant hereby amends this Registration Statement on such date
    or dates as may be necessary to delay its effective date until the
    Registrant shall file a further amendment which specifically states that
    this Registration Statement shall thereafter become effective in
    accordance with Section 8(a) of the Securities Act of 1933 or until this
    Registration Statement shall become effective on such date as the
    Commission, acting pursuant to said Section 8(a), may determine.


PAGE
<PAGE>





                            Trex Medical Corporation

                             Cross Reference Sheet
                    Between Items of Form S-1 and Prospectus

            Item                         Location in Prospectus
            ----                         ----------------------

         1  Forepart of the
            Registration Statement and
            Outside Front Cover Page of  Outside Front Cover Page
            Prospectus  ................
         2  Inside Front and Outside
            Back Cover Pages of          Inside Front and Outside Back
            Prospectus  ................ Cover Pages; Additional
                                         Information
         3  Summary Information, Risk
            Factors and Ratio of
            Earnings to Fixed Charges  . The Company; Risk Factors

         4  Use of Proceeds ............ Not Applicable
         5  Determination of Offering    Not Applicable
            Price ......................
         6  Dilution ................... Not Applicable

         7  Selling Security Holders ... Selling Shareholders; Sale of
                                         Shares
         8  Plan of Distribution ....... Cover Page; Selling
                                         Shareholders; Sale of Shares
         9  Description of Securities
            to be Registered ........... Cover Page, Description of
                                         Capital Stock

         10 Interests of Named Experts
            and Counsel ................ Experts; Legal Opinions
         11 Information with Respect to
            the Registrant ............. Cover Page; The Company; Risk
                                         Factors; Price Range of Common
                                         Stock; Dividend Policy;
                                         Capitalization; Selected
                                         Financial Information;
                                         Management's Discussion and
                                         Analysis of Financial
                                         Condition and Results of
                                         Operations; Business;
                                         Relationship with Thermo
                                         Electron and Thermo
                                         Instrument; Management;
                                         Security Ownership of Certain
                                         Beneficial Owners and
                                         Management; Description of
                                         Capital Stock; Shares Eligible
                                         for Future Sale; Financial
                                         Statements
PAGE
<PAGE>





         12 Disclosure of Commission
            Position on Indemnification
            for Securities Act           Not Applicable
            Liabilities  ...............
PAGE
<PAGE>





    Information contained herein is subject to completion or amendment.  A
    registration statement relating to these securities has been filed with
    the Securities and Exchange Commission.  These securities may not be sold
    nor may offers to buy be accepted prior to the time the registration
    statement becomes effective.  This prospectus shall not constitute an
    offer to sell or the solicitation of an offer to buy nor shall there be
    any sale of these securities in any State in which such offer,
    solicitation or sale would be unlawful prior to registration or
    qualification under the securities laws of any such State.

        
                  SUBJECT TO COMPLETION, DATED JANUARY 7, 1997
         

    PROSPECTUS
                                 300,000 Shares

                            TREX MEDICAL CORPORATION

                                  Common Stock

       This Prospectus relates to 300,000 shares (the "Shares") of Common
    Stock, par value $.01 per share (the "Common Stock"), of Trex Medical
    Corporation ("Trex Medical" or the "Company").  The Shares may be offered
    by certain shareholders of the Company (the "Selling Shareholders") from
    time to time in transactions on the American Stock Exchange, in
    negotiated transactions, through the writing of options on the Shares, or
    a combination of such methods of sale, at fixed prices that may be
    changed, at market prices prevailing at the time of sale, at prices
    related to such prevailing market prices or at negotiated prices.  The
    Selling Shareholders may effect such transactions by selling the Shares
    to or through broker-dealers, and such broker-dealers may receive
    compensation in the form of discounts, concessions or commissions from
    the Selling Shareholders and/or the purchasers of the Shares for whom
    such broker-dealers may act as agent or to whom they sell as principal,
    or both (which compensation to a particular broker-dealer might be in
    excess of customary commissions).  The Selling Shareholder and any
    broker-dealer who acts in connection with the sales of Shares hereunder
    may be deemed to be "underwriters" as that term is defined in the
    Securities Act of 1933, as amended (the "Securities Act"), and any
    commissions received by them and profit on any resale of the Shares as
    principal might be deemed to be underwriting discounts and commissions
    under the Securities Act.  The Shares were originally sold by the Company
    in private placements pursuant to certain Stock Purchase Agreements with
    the Company dated December 19, 1996.  See "Selling Shareholders."
                                _______________ 

        The Common Stock offered hereby involves a high degree of risk.
                    See "RISK FACTORS" beginning at page 5.
                                _______________ 

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
         SECURITIES
     AND  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION


                                        2
PAGE
<PAGE>





          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.  ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                                 _______________

       None of the proceeds from the sale of the Shares by the Selling
    Shareholders will be received by the Company.  The Company has agreed to
    bear all expenses (other than underwriting discounts and selling
    commissions, and fees and expenses of counsel or other advisers to the
    Selling Shareholders) in connection with the registration and sale of the
    Shares being registered hereby.  The Company has agreed to indemnify the
    Selling Shareholders against certain liabilities, including liabilities
    under the Securities Act as underwriter or otherwise.

       Trex Medical Corporation is a majority-owned subsidiary of ThermoTrex
    Corporation ("ThermoTrex"), which is a majority-owned subsidiary of
    Thermo Electron Corporation ("Thermo Electron").  The Common Stock is
    traded on the American Stock Exchange under the symbol "TXM."  On
    December 20, 1996, the reported closing price of the Common Stock on the
    American Stock Exchange was $14.75 per share.
       
    The date of this Prospectus is January __, 1997.
        


































                                        3
PAGE
<PAGE>





                                TABLE OF CONTENTS


    The Company  ............................................. 4

    Risk Factors  ............................................ 5

       

    Price Range of Common Stock  .............................11

    Dividend Policy  .........................................11

    Capitalization  ..........................................12

    Selected Financial Information  ..........................13

    Selected Quarterly Financial Data  .......................15

    Management's Discussion and Analysis of Financial

        Condition and Results of Operations  .................16

    Business  ................................................19

    Relationship and Potential Conflicts with Thermo

        Electron and ThermoTrex  .............................30

    Management  ..............................................34

    Executive Compensation  ..................................39

    Security Ownership of Certain Beneficial Owners 

        and Management  ......................................42

    Selling Shareholders  ....................................45

    Sale of Shares  ..........................................46

    Description of Capital Stock  ............................46

    Shares Eligible for Future Sale  .........................47

    Legal Opinions  ..........................................48

    Experts  .................................................48

    Additional Information  ..................................49

        

    Index to Financial Statements  ..........................F-1


                                        4
PAGE
<PAGE>






                                  THE COMPANY

      The Company is a worldwide leader in the design, manufacture and
    marketing of mammography equipment and minimally invasive stereotactic
    needle biopsy systems used for the detection of breast cancer, as well as
    a leading designer and manufacturer of general radiography (X-ray)
    equipment. A mammography system is a dedicated radiographic system
    designed specifically to image breast tissue. Stereotactic needle biopsy
    systems, which use a guided hollow needle to extract a sample of tissues
    from the breast, offer a cost-effective, less invasive alternative to
    open surgery for the biopsy of suspicious breast lesions. The Company
    recently broadened its product base by acquiring Bennett X-Ray
    Corporation ("Bennett"), a leading producer of specialty and general
    purpose radiographic systems, including mammography systems, XRE
    Corporation ("XRE"), a manufacturer of X-ray imaging systems used for
    cardiac catheterization and angiography and Continental X-Ray Corporation
    and its affiliates (collectively "Continental") a manufacturer of general
    purpose radiographic systems and specialty radiographic systems including
    radiographic/flouroscopy products. 

      The Company was incorporated in Delaware in September 1995 as a
    wholly-owned subsidiary of ThermoTrex. ThermoTrex acquired all of the
    outstanding shares of capital stock of Bennett in September 1995 for
    approximately $42,000,000 in cash, net of cash acquired. On October 2,
    1995, the Company acquired all of the outstanding shares of capital stock
    of Bennett from ThermoTrex in exchange for a $42,000,000 principal amount
    subordinated convertible note due 2000 (the "Convertible Note"). The
    Convertible Note bears interest at a rate of 4.2% per annum and is
    convertible into shares of Common Stock at a conversion price of $11.79
    per share.  As of November 30, 1996, ThermoTrex had converted $34,000,000
    principal amount of the Convertible Note for an aggregate of 2,883,798
    shares of Common Stock.  Subsequently, on October 16, 1995, ThermoTrex
    contributed all of the assets and liabilities relating to its Lorad
    division ("Lorad") and the development of its Sonic CT system to the
    Company in exchange for 20,000,000 shares of Common Stock of the Company.
    On May 29, 1996, the Company acquired substantially all of the assets and
    liabilities of XRE for approximately $18,500,000 in cash, net of cash
    acquired and including the repayment of debt.  On September 4, 1996, the
    Company acquired substantially all of the assets and liabilities of
    Continental for approximately $18.4 million in cash, net of cash acquired
    and including the repayment of debt.

      Unless the context otherwise requires, references in this Prospectus
    to the Company or Trex Medical Corporation refer to Trex Medical
    Corporation and its subsidiaries. As of December 20, 1996, ThermoTrex
    beneficially owned 79% of the Company's outstanding Common Stock,
    excluding the shares of Common Stock issuable upon the conversion of the
    outstanding principal amount of the Convertible Note. The Company's
    principal executive offices are located at 36 Apple Ridge Road, Danbury,
    Connecticut, and its telephone number is (203) 790-1188. 





                                        5
PAGE
<PAGE>





                                  RISK FACTORS

      An investment in the shares of Common Stock offered hereby involves a
    high degree of risk. Accordingly, the following factors should be
    considered carefully in evaluating the Company and its business before
    purchasing any of such shares. 

      Technological Change and New Products. The market for the Company's
      -------------------------------------
    products is characterized by rapid and significant technological change,
    evolving industry standards and new product introductions. Many of the
    Company's products are technologically innovative, and require
    significant planning, design, development, and testing at the
    technological, product, and manufacturing process levels. These
    activities require significant capital commitments and investment by the
    Company. The high cost of technological innovation is matched by the
    rapid and significant change in the technologies governing the products
    that are competitive in the Company's market, by industry standards that
    may change on short notice and by the introduction of new products and
    technologies such as magnetic resonance imaging and ultrasound, which may
    render existing products and technologies uncompetitive or obsolete.
    There can be no assurance that the Company's products or proprietary
    technologies will not become uncompetitive or obsolete.

      Dependence on Patents and Proprietary Rights. The Company places
      --------------------------------------------
    considerable importance on obtaining patent and trade secret protection
    for significant new technologies, products, and processes because of the
    length of time and expense associated with bringing new products through
    the development and regulatory approval process and to the marketplace.
    The Company's success depends in part on whether it can develop
    patentable products and obtain and enforce patent protection for its
    products both in the United States and in other countries. The Company
    has filed, and intends to file, applications as appropriate for patents
    covering both its products and manufacturing processes. No assurance can
    be given that patents will issue from any pending or future patent
    applications owned by, or licensed to, the Company, or that the claims
    allowed under any issued patents will be sufficiently broad to protect
    the Company's technology. In addition, no assurance can be given that any
    issued patents owned by, or licensed to, the Company will not be
    challenged, invalidated, or circumvented, or that the rights granted
    thereunder will provide competitive advantages to the Company. The
    Company could incur substantial costs in defending itself in suits
    brought against it or in suits in which the Company may assert its patent
    rights against others. If the outcome of any such litigation is
    unfavorable to the Company, the Company's business and results of
    operations could be materially adversely affected.

      The Company relies on trade secrets and proprietary know-how that it
    seeks to protect, in part, by confidentiality agreements with its
    collaborators, employees, and consultants. There can be no assurance that
    these agreements will not be breached, that the Company would have
    adequate remedies for any breach, or that the Company's trade secrets
    will not otherwise become known or be independently developed by
    competitors.

       

                                        6
PAGE
<PAGE>





      Risks Associated With Pending and Threatened Patent Litigation. In
      --------------------------------------------------------------
    April 1992, Fischer Imaging Corporation ("Fischer") commenced a lawsuit
    in the United States District Court, District of Colorado, against the
    Company's Lorad division, alleging that Lorad's prone breast-biopsy
    system infringes a Fischer patent on a precision mammographic
    needle-biopsy system. As of September 28, 1996, the Company had
    recognized aggregate revenues of approximately $63.1 million from sales
    of such systems, of which $34.4 million represents sales prior to October
    1, 1995. The suit requests a permanent injunction, treble damages, and
    attorneys' fees and expenses. If the Company is unsuccessful in defending
    this lawsuit, it may be enjoined from manufacturing and selling such
    systems without a license from Fischer. No assurance can be given that
    the Company will be able to obtain such a license, if required, on
    commercially reasonable terms, if at all. In addition, the Company may be
    subject to damages for past infringement. No assurance can be given as to
    whether the Company will be subject to such damages or, if so, the amount
    of damages that the Company may be required to pay.
        

      The Company also is aware of a U.S. patent held by Nicola E. Yanaki,
    which has been asserted by him against certain automatic exposure-control
    features included in most of the Company's current mammography systems.
    The Company has been informed by Mr. Yanaki that a competitor of the
    Company has obtained a license for use of this patent. If Mr. Yanaki were
    successful in enforcing such patent, the Company could be subject to
    damages for past infringement and enjoined from manufacturing and selling
    imaging equipment utilizing certain automatic exposure-control features.

      The Company is also aware of an issued European patent with
    counterparts in other non-U.S. countries applicable to imaging equipment
    utilizing certain automatic exposure-control features. The European
    patent is the subject of an opposition proceeding before the European
    Patent Office. There can be no assurance as to the outcome of such
    opposition.

      In connection with the organization of the Company, ThermoTrex agreed
    to indemnify the Company for any and all cash damages in connection with
    the Fischer lawsuit and any potential claims by Mr. Yanaki with respect
    to sales of the Company's products occurring prior to October 1995, when
    the businesses of Lorad and Bennett were transferred to the Company.
    Notwithstanding this indemnification, the Company would be required to
    report as an expense the full amount, including any reimbursable amount,
    of any damages in excess of the amount accrued as of September 28, 1996
    (approximately $2 million), with any indemnification payment it receives
    from ThermoTrex being treated as a contribution to shareholders'
    investment.

      The Company is also aware of two U.S. patents owned by a former
    employee that have been asserted against the Company relating to its
    high-transmission cellular ("HTC")(TM) grid to be used with its
    mammography systems. If the former employee were successful in enforcing
    such patents, the Company could be subject to damages and enjoined from
    manufacturing and selling the HTC grid.



                                        7
PAGE
<PAGE>





      The unfavorable outcome of any one or more of the above described
    matters could have a material adverse effect on the Company's business
    and results of operations. The Company's competitors and other parties
    hold other various patents and patent applications in the fields in which
    the Company operates. There can be no assurance that the Company will not
    be found to have infringed third-party patents and, in the event of such
    infringement, the Company could be required to alter its products or
    processes, pay licensing fees, or cease making and selling any infringing
    products and pay damages for past infringement.

      No Assurance of Development and Commercialization of Products Under
      -------------------------------------------------------------------
    Development. A number of the Company's potential products are currently
    -----------
    under development. There are a number of technological challenges that
    the Company must successfully address to complete any of its development
    efforts. Product development involves a high degree of risk, and returns
    to investors are dependent upon successful development and
    commercialization of such products. Proposed products based on the
    Company's technologies will require significant additional research and
    development. There can be no assurance that any of the products currently
    being developed by the Company, or those to be developed in the future by
    the Company, will be technologically feasible or accepted by the
    marketplace, or that any such development will be completed in any
    particular time frame.

      Risks Associated with Acquisition Strategy. The Company's strategy
      ------------------------------------------
    includes the acquisition of businesses and technologies that complement
    or augment the Company's existing product lines. For example, in October
    1995, the Company acquired its Bennett subsidiary; in May 1996, the
    Company acquired substantially all of the assets and liabilities of XRE,
    a manufacturer of X-ray imaging systems used in the diagnosis and
    treatment of coronary artery disease and other vascular conditions; and
    in September 1996, the Company acquired substantially all of the assets
    and liabilities of Continental, a manufacturer of radiographic
    fluoroscopy products, general radiography systems, electrophysiology
    products and dedicated mammography systems. Promising acquisitions are
    difficult to identify and complete for a number of reasons, including
    competition among prospective buyers and the need for regulatory
    approvals, including antitrust approvals. There can be no assurance that
    the Company will be able to complete future acquisitions or that the
    Company will be able to successfully integrate any acquired businesses.
    In order to finance such acquisitions, it may be necessary for the
    Company to raise additional funds through public or private financings.
    Any equity or debt financing, if available at all, may be on terms that
    are not favorable to the Company and, in the case of equity financing,
    may result in dilution to the Company's stockholders.

      Intense Competition. The Company encounters and expects to continue to
      -------------------
    encounter intense competition in the sale of its products. The Company
    believes that the principal competitive factors affecting the market for
    its products include product features, product performance and
    reputation, price, and service. The Company's competitors include large
    multinational corporations and their operating units, including the GE
    Medical Systems Division of General Electric Company, Inc. ("GE"), the  
    Philips Medical Systems of North Americ Company subsidiary of Philips
    N.V. ("Philips"), the Siemens Corporation subsidiary of Siemens AG

                                        8
PAGE
<PAGE>





    ("Siemens"), Toshiba American Medical Systems, Inc. and Toshiba America
    MRI, Inc. (collectively, "Toshiba"), Shimadzu, and the Picker
    International, Inc. subsidiary of GEC, Inc. ("Picker International").
    These companies and certain of the Company's other competitors have
    substantially greater financial, marketing, and other resources than the
    Company. As a result, they may be able to adapt more quickly to new or
    emerging technologies and changes in customer requirements, or to devote
    greater resources to the promotion and sale of their products than the
    Company. Moreover, a significant portion of the Company's sales are to
    the United States Surgical Corporation ("U.S. Surgical"), GE, and Philips
    through OEM arrangements. The products sold by such OEM customers compete
    with products offered by the Company and its independent dealers.
    Competition could increase if new companies enter the market or if
    existing competitors expand their product lines or intensify efforts
    within existing product lines. There can be no assurance that the
    Company's current products, products under development, or ability to
    discover new technologies will be sufficient to enable it to compete
    effectively with its competitors.

      Government Regulation, No Assurance of Regulatory Approval. The
      ----------------------------------------------------------
    Company's products are subject to regulation by the U.S. Food and Drug
    Administration (the FDA) and equivalent agencies in foreign countries.
    Failure to comply with applicable regulatory requirements can result in,
    among other things, civil and criminal fines, suspensions of approvals,
    recalls of products, seizures, injunctions, and criminal prosecutions.

      To date, all of the Company's products have been classified by the FDA
    as Class II medical devices and have been eligible for FDA marketing
    clearance pursuant to the FDA's 510(k) premarket notification process,
    which is generally shorter than the more involved premarket approval
    (PMA) process. The Company believes that most of its currently
    anticipated future products and substantial modifications to existing
    products will be eligible for the 510(k) premarket notification process.
    However, the FDA has not yet classified full-breast digital mammography
    systems such as the one being developed by the Company. If such systems
    are classified as Class III devices, the Company would be required to
    file for FDA marketing clearance for its full-breast digital mammography
    system under the PMA process, which would require substantial additional
    clinical trials and post-market follow-up for a number of years. While
    not classifying such systems, the FDA recently issued a final guidance
    document relating to the protocol for marketing clearance of full-breast
    digital mammography systems. This document suggests that clearance may be
    obtained through an enhanced 510(k) application with more extensive
    clinical trials. The protocol set forth in the final guidance document
    calls for clinical trials on 520 subjects prior to applying to the FDA
    for clearance to commercially market such a system. In addition,
    full-breast digital mammography systems will be subject to alternate
    quality assurance standards under the Mammography Quality Standards Act.
    These alternate standards will be submitted by the Company to the FDA for
    review. The Company can make no prediction as to when the FDA will
    approve such standards, if at all. There can be no assurance that
    full-breast digital mammography systems will not be classified by the FDA
    as Class III medical devices subject to the PMA process. In addition,
    there can be no assurance that the necessary clearances for any of the
    Company's products will be obtained on a timely basis, if at all. 

                                        9
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<PAGE>






      FDA regulations also require manufacturers of medical devices to
    adhere to certain "Good Manufacturing Practices" (GMP), which include
    testing, quality control, and documentation procedures. The Company's
    manufacturing facilities are subject to periodic inspection by the FDA.
    No assurances can be given that the FDA will not in the future find the
    Company to be in violation of one or more such regulations.

      Healthcare Reform; Uncertainty of Patient Reimbursement. The Federal
      -------------------------------------------------------
    government has in the past, and may in the future, consider, and certain
    state and local as well as a number of foreign governments are
    considering or have adopted, healthcare policies intended to curb rising
    healthcare costs. Such policies include rationing of government-funded
    reimbursement for healthcare services and imposing price controls upon
    providers of medical products and services. The Company cannot predict
    what healthcare reform legislation or regulation, if any, will be enacted
    in the United States or elsewhere. Significant changes in the healthcare
    systems in the United States or elsewhere are likely to have a
    significant impact over time on the manner in which the Company conducts
    its business. In addition, the federal government regulates reimbursement
    of fees for certain diagnostic examinations and capital equipment
    acquisition costs connected with services to Medicare beneficiaries.
    Recent legislation has limited Medicare reimbursement for diagnostic
    examinations. These policies may have the effect of limiting the
    availability or reimbursement for certain procedures, and as a result may
    inhibit or reduce demand by healthcare providers for products in the
    markets in which the Company competes. While the Company cannot predict
    what effect the policies of government entities and other third party
    payors will have on future sales of the Company's products, there can be
    no assurance that such policies would not have an adverse impact on the
    operations of the Company.

      Dependence Upon Significant OEM Relationships. A significant portion
      ---------------------------------------------
    of the Company's sales are to U.S. Surgical, GE, and Philips through OEM
    arrangements. The Company's sales depend, in part, on the continuation of
    these OEM arrangements and the level of end-user sales by such OEMs.
    There can be no assurance that the Company will be able to maintain its
    existing, or establish new, OEM relationships.

      Potential Product Liability. The Company's business exposes it to
      ---------------------------
    potential product liability claims, which are inherent in the
    manufacturing, marketing, and sale of medical devices, and as such the
    Company may face substantial liability to patients for damages resulting
    from the faulty design or manufacture of products. The Company currently
    maintains product-liability insurance, but there can be no assurance that
    this insurance will provide sufficient coverage in the event of a claim,
    that the Company will be able to maintain such coverage on acceptable
    terms, if at all, or that a product-liability claim would not materially
    adversely affect the business or financial condition of the Company.

      Risks Associated With International Operations. International sales
      ----------------------------------------------
    accounted for 22%, 21%, and 14% of the Company's revenues in fiscal 1996,
    fiscal 1995, and 1994, respectively. The Company intends to continue to
    expand its presence in international markets. International revenues are
    subject to a number of risks, including the following: agreements may be

                                       10
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<PAGE>





    difficult to enforce and receivables difficult to collect through a
    foreign country's legal system; foreign customers may have longer payment
    cycles; foreign countries may impose additional withholding taxes or
    otherwise tax the Company's foreign income, impose tariffs or adopt other
    restrictions on foreign trade; U.S. export licenses may be difficult to
    obtain; and the protection of intellectual property in foreign countries
    may be more difficult to enforce.

      Control by ThermoTrex.   The Company's stockholders do not have the
      ---------------------
    right to cumulate votes for the election of directors. ThermoTrex, which
    owns 79% of the outstanding Common Stock of the Company, has the power to
    elect the entire Board of Directors of the Company and to approve or
    disapprove any corporate actions submitted to a vote of the Company's
    stockholders. See "Relationship and Potential Conflicts of Interest with
    Thermo Electron and ThermoTrex" and "Security Ownership of Certain
    Beneficial Owners and Management." 

      Potential Conflicts of Interest.   The Company may be subject to
      -------------------------------
    potential conflicts of interest from time to time as a result of its
    relationship with Thermo Electron and ThermoTrex. For example, conflicts
    may arise in the development and licensing of digital detector technology
    by ThermoTrex to the Company, the manufacture of digital detectors by
    ThermoTrex for sale to the Company and the Company's manufacturing of
    lasers for sale to ThermoLase Corporation. See "Relationship and
    Potential Conflicts of Interest with Thermo Electron and ThermoTrex."
    Certain officers of the Company are also officers of ThermoTrex, Thermo
    Electron and/or other subsidiaries of Thermo Electron, and are full-time
    employees of ThermoTrex or Thermo Electron. Such officers will devote
    only a portion of their working time to the affairs of the Company. For
    financial reporting purposes, the Company's financial results are
    included in the consolidated financial statements of ThermoTrex and
    Thermo Electron. The members of the Board of Directors of the Company who
    are also affiliated with Thermo Electron or ThermoTrex will consider not
    only the short-term and the long-term impact of operating decisions on
    the Company, but also the impact of such decisions on the consolidated
    financial results of ThermoTrex and Thermo Electron. In some instances
    the impact of such decisions could be disadvantageous to the Company
    while advantageous to ThermoTrex or Thermo Electron, or vice versa. The
    Company is a party to various agreements with Thermo Electron that may
    limit the Company's operating flexibility. See "Relationship and
    Potential Conflicts of Interest with Thermo Electron and ThermoTrex." 

      Significant Additional Shares Eligible for Future Sale.   The
      ------------------------------------------------------
    22,883,798 shares of Common Stock owned by ThermoTrex will become
    eligible for resale under Rule 144 in October 1997. In addition, subject
    to certain limitations described below under "Shares Eligible For Future
    Sale," as long as ThermoTrex is able to elect a majority of the Company's
    Board of Directors, it will have the ability to cause the Company at any
    time to register for resale all or a portion of the Common Stock owned by
    ThermoTrex. 

      Additional shares of Common Stock issuable upon exercise of options
    granted under the Company's stock-based compensation plans will become
    available for future sale in the public market at prescribed times. Sales
    of a significant number of shares of Common Stock in the public market

                                       11
PAGE
<PAGE>





    could adversely affect the market price of the Common Stock. See
    "Relationship and Potential Conflicts of Interest with Thermo Electron
    and ThermoTrex" and  "Shares Eligible for Future Sale."
     
      Potential Volatility of Stock Price.  Since public trading of the
      -----------------------------------
    Company's Common Stock commenced in June 1996, the market price has
    fluctuated considerably, and it may continue to fluctuate in the future.
    Factors such as fluctuations in the Company's operating results,
    announcements of technological innovations or new contracts or products
    by the Company or its competitors, government regulation and approvals,
    developments in patent or other proprietary rights and market conditions
    for stocks of companies similar to the Company could have a significant
    impact on the market price of the Common Stock. 

      Lack of Dividends.   The Company anticipates that for the foreseeable
      -----------------
    future the Company's earnings, if any, will be retained for use in the
    business and that no cash dividends will be paid on the Common Stock.
    Declaration of dividends on the Common Stock will depend upon, among
    other things, future earnings, the operating and financial condition of
    the Company, its capital requirements and general business conditions.
    See "Dividend Policy." 


                           PRICE RANGE OF COMMON STOCK

       The Company's Common Stock has been publicly traded on the American
    Stock Exchange since June 27, 1996.  The following sets forth, for the
    calendar period indicated, the high and low sales prices on the American
    Stock Exchange.

                                            High      Low
                                            ----      ---
    Fiscal 1996
    -----------
    Third Quarter 
    (June 27, 1996 through June 28, 1996)   $19.25    $15.375

    Fourth Quarter                          $26.00    $17.875

    Fiscal 1997
    -----------
    First Quarter 
    (through December 20, 1996)             $20.25    $14.375

       As of December 20, 1996, there were approximately 830 record holders
    of Common Stock.


                                 DIVIDEND POLICY

      The Company anticipates that for the foreseeable future the Company's
    earnings, if any, will be retained for use in the business and that no
    cash dividends will be paid on the Common Stock. 






                                       12
PAGE
<PAGE>





                                 CAPITALIZATION

         The following table sets forth the capitalization of the Company as
    of September 28, 1996 and as adjusted to reflect the issuance and sale by
    the Company of 300,000 shares of Common Stock at $14.50 per share on
    December 19, 1996, for net proceeds of $4,215,000, after deducting
    placement agent commissions and estimated offering expenses payable by
    the Company.

                                                       September 28, 1996
                                                     ----------------------
                                                       Actual   As Adjusted
                                                     --------   -----------
                                                     (In thousands, except
                                                          share amounts)

    Long-term Obligations:
      Subordinated convertible note, due to
        parent company                               $  8,000     $  8,000
      Other                                               109          109
                                                     --------     --------

                                                        8,109        8,109
                                                     --------     --------

    Shareholders' Investment:
      Common stock, $.01 par value, 50,000,000
        shares authorized; 28,592,630 shares
        issued and outstanding and 28,892,630
        shares as adjusted (1)                            286          289
      Capital in excess of par value                  139,667      143,879
      Retained earnings                                 9,344        9,344
                                                     --------     --------

        Total Shareholders' Investment                149,297      153,512
                                                     --------     --------

          Total Capitalization (Long-term
            Obligations and Shareholders'
            Investment)                              $157,406     $161,621
                                                     ========     ========
    ____________________
    (1)
    Does not include 1,925,000 shares of Common Stock reserved for issuance
    under the Company's stock-based compensation plans and 678,541 shares of
    Common Stock reserved for issuance upon conversion of the outstanding
    principal amount of the Convertible Note. Options to purchase 1,655,500
    shares of Common Stock were outstanding under the Company's stock-based
    compensation plans as of December 13, 1996. See "Managment--Compensation
    of Directors" and "Executive Compensation" and Notes 4 and 5 of Notes to
    Consolidated Financial Statements.


    


                                      SELECTED FINANCIAL INFORMATION
<TABLE>

    The selected financial information below as of and for the fiscal years ended 
September 30, 1995, and for the fiscal year ended December 31, 1994 has been deriv
Consolidated Financial Statements, which have been audited by Arthur Andersen LLP,
accountants, as indicated in their report included elsewhere in this Prospectus. T
information as of and for the fiscal year ended January 1, 1994 and as of December
derived from the Company's Consolidated Financial Statements which have been audit
LLP, but have not been included in this Prospectus. The selected financial informa
year ended January 2, 1993, and the twelve months ended September 30, 1995 has not
the opinion of the Company, includes all adjustments (consisting only of normal, r
necessary to present fairly such information in accordance with generally accepted
applied on a consistent basis.

<CAPTION>
                                                       Nine Months
                                  Year Ended (1)          Ended
                              ----------------------
                              Sept. 28,    Sept. 30,    Sept. 30,              Fis
                                                                     -------------
                               1996 (5)    1995 (2,4)  1995 (1,2,4)       1994
                              ----------------------------------------------------
                                                (In thousands, except per share amo
                                 <C>           <C>         <C>          <C>
Statement of Income Data:
Revenues                       $150,195     $ 70,505     $ 55,291     $ 54,410
                               --------     --------     --------     --------
Costs and Operating Expenses:
  Cost of revenues               86,642       36,320       28,180       27,794
  Selling, general and
    administrative expenses      27,156       15,652       12,174       13,272
  Research and development
    expenses                     18,862       11,937        8,595       10,662
                               --------     --------     --------     --------

                                132,660       63,909       48,949       51,728
                               --------     --------     --------     --------

Operating Income (Loss)          17,535        6,596        6,342        2,682
Interest and Other Income
  (Expense), Net                    (23)          11           22          (22)
                               --------     --------     --------     --------
Income (Loss) Before Income
  Taxes                          17,512        6,607        6,364        2,660
Income Tax Provision (Benefit)    8,168        3,015        2,881        1,466
                               --------     --------     --------     --------
Net Income (Loss)              $  9,344     $  3,592     $  3,483     $  1,194
                               ========     ========     ========     ========

</TABLE>
PAGE
<PAGE>

                              SELECTED FINANCIAL INFORMATION -- (Continued)
<TABLE>

<CAPTION>
                                                       Nine Months
                                  Year Ended (1)          Ended
                              ----------------------
                              Sept. 28,    Sept. 30,    Sept. 30,              Fis
                                                                     -------------
                               1996 (5)    1995 (2,4)  1995 (1,2,4)       1994
                              ----------------------------------------------------
                                                (In thousands, except per share amo
                                <C>           <C>           <C>          <C>      
Earnings (Loss) per
  Share (6):
    Primary                    $    .40     $    .18     $    .17     $    .06
                               ========     ========     ========     ========
    Fully diluted              $    .38     $    .18     $    .17     $    .06
                               ========     ========     ========     ========
Weighted Average Shares (6):
    Primary                      23,483       20,151       20,151       20,151
                               ========     ========     ========     ========
    Fully diluted                26,550       20,151       20,151       20,151
                               ========     ========     ========     ========
Balance Sheet Data
  (at end of period):
Working Capital                $ 59,834                  $ 13,171     $  8,584
Total Assets                    200,850                   102,374       48,000
Long-term Obligations             8,109                         -            -
Shareholders' Investment        149,297                    80,010       37,033
____________________
(1) All periods presented include ThermoTrex's research and development business p
    CT system.
(2) In September 1995, the Company changed its fiscal year-end from the Saturday n
    the Saturday nearest September 30. Accordingly, the Company's transition perio
    to September 30, 1995 ("fiscal 1995") is presented. The unaudited data for the
    September 30, 1995 is presented for comparative purposes only.
(3) Includes the results of Lorad since its acquisition by ThermoTrex in November
(4) Includes the results of Bennett since its acquisition by ThermoTrex in Septemb
(5) Reflects the May 1996 and September 1996 acquisitions of XRE and Continental, 
    net proceeds of the Company's private placements in November 1995 and January 
    offering in July 1996.
(6) Pursuant to Securities and Exchange Commission requirements, earnings (loss) p
    presented for all periods. Weighted average shares for all periods include the
    issued to ThermoTrex in connection with the initial capitalization of the Comp
    the assumed exercise of stock options issued within one year prior to the Comp
    offering.
</TABLE>








                                      1313
PAGE
<PAGE>





                  SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

                                        Fiscal 1996

                           First      Second    Third (1) Fourth (2)
                          Fourth (2)                      Fourth (2)
                          (in thousands, except per share amounts)

     Revenues               $32,509    $34,320   $36,681     $46,685
     Gross Profit            14,261     14,976    15,961      18,355

     Net Income               1,626      2,108     2,169       3,441
     Earnings per share
           Primary             0.08       0.10      0.10        0.12

           Fully               0.08       0.09      0.09        0.12
                                      Fiscal 1995 (3)

                           First      Second    Third (4)
                          (in thousands, except per share amounts)

     Revenues               $16,101    $17,197   $21,993 
     Gross Profit             8,116      8,575    10,420 

     Net Income                 857      1,344     1,282 
     Earnings per share        0.04       0.07      0.06 
                                        Fiscal 1994

                           First      Second      Third     Fourth
                          (in thousands, except per share amounts)

     Revenues               $11,886    $13,214   $14,096     $15,214

     Gross Profit             6,115      6,542     6,885       7,074
     Net Income                 354        329       402         109

     Earnings per share        0.02       0.02      0.02        0.01

    (1)  Reflects the acquisition of XRE in May 1996.
    (2)  Reflects the acquisition of Continental in September 1996.
    (3)  In September 1995, the Company changed its fiscal year end from the
         Saturday nearest December 31 to the Saturday nearest September 30.
         Accordingly, the Company's 39-week transition period ended
         September 30, 1995 is presented.
    (4)  Includes the results of Bennett since its acquisition by ThermoTrex
         in September 1995.











                                       16
PAGE
<PAGE>





                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

    Overview

      The Company designs, manufactures, and markets mammography equipment
    and minimally invasive stereotactic breast-biopsy systems, general
    radiography (X-ray) equipment, and X-ray imaging systems used for cardiac
    catheterization and angiography, as well as radiographic fluoroscopy. The
    Company sells its systems worldwide principally through a network of
    independent dealers. In addition, the Company manufactures mammography
    and radiography systems as an original equipment manufacturer (OEM) for
    other medical equipment companies such as U.S. Surgical, GE and Philips.
    The Company has four operating units: Lorad, a manufacturer of
    mammography and stereotactic breast-biopsy systems; Bennett, a
    manufacturer of general X-ray and mammography equipment; XRE, a
    manufacturer of X-ray imaging systems used in the diagnosis and treatment
    of coronary artery disease and other vascular conditions; and
    Continental, a manufacturer of general-purpose and specialized X-ray
    systems.

      The Company conducts all of its manufacturing operations in the United
    States and sells its products on a worldwide basis. The Company
    anticipates that an increasing percentage of its revenues will be from
    export sales. The Company's export sales are denominated in U.S. dollars;
    therefore, neither its revenue nor its earnings are significantly
    affected by exchange rate fluctuations.

    Results of Operations

      In September 1995, the Company changed its fiscal year end from the
    Saturday nearest December 31 to the Saturday nearest September 30.
    Accordingly, the results of operations for 1996 compares the year ended
    September 28, 1996 (fiscal 1996) with the unaudited year ended September
    30, 1995 (1995). The results of operations for 1995 compares the nine
    months ended September 30, 1995 (fiscal 1995) with the unaudited nine
    months ended October 1, 1994 (fiscal 1994).

    Fiscal 1996 Compared With 1995
    ------------------------------

      Revenues increased 113% to $150.2 million in fiscal 1996 from $70.5
    million in 1995. Revenues increased $56.2 million due to the acquisitions
    of Bennett, XRE, and Continental.

      Revenues at Lorad increased 35% in fiscal 1996 as a result of
    increased demand for mammography, biopsy, and nondestructive testing
    (NDT) systems, and lasers sold to ThermoLase Corporation ("ThermoLase"),
    a majority-owned subsidiary of ThermoTrex.

      Under an OEM agreement with U.S. Surgical entered into in fiscal 1996,
    Lorad has agreed to manufacture biopsy systems for U.S. Surgical to be
    marketed and sold under the U.S. Surgical product name of Advanced Breast
    Biopsy Instrument (ABBI). In fiscal 1996, sales to U.S. Surgical totaled
    $16.9 million.


                                       17
PAGE
<PAGE>





      The gross profit margin declined to 42% in fiscal 1996, from 48% in
    1995, due primarily to the inclusion of lower-margin revenues at Bennett
    and XRE.

      Selling, general and administrative expenses as a percentage of
    revenues decreased to 18% in fiscal 1996 from 22% in 1995, due primarily
    to increased revenues at Lorad and the inclusion of the operations of
    Bennett and XRE, which incurred lower expenses as a percentage of
    revenues. Research and development expenses increased to $18.9 million in
    fiscal 1996 from $11.9 million in 1995, due to the inclusion of $4.2
    million of expense at Bennett and XRE and the Company's continued efforts
    to develop and commercialize new products including the Company's M-IV
    mammography system (first shipped in the fourth quarter of fiscal 1996),
    full-breast digital mammography system, and direct-detection X-ray
    sensor, as well as enhancements of existing systems. Under a license
    agreement between the Company and ThermoTrex, the Company may elect to
    expend approximately $2.0 million each year during fiscal 1997 and 1998
    for additional research and development and to expand the field of use in
    which it is entitled to use ThermoTrex's direct-detection digital imaging
    technology.  See Note 9 of Notes to Consolidated Financial Statements.

      Interest income in fiscal 1996 primarily represents interest income
    earned on the invested proceeds from the Company's private placements of
    common stock in November 1995 and January 1996, and initial public
    offering in July 1996. Interest expense in fiscal 1996 represents
    interest associated with the $42.0 million principal amount 4.2%
    subordinated convertible note issued to ThermoTrex in October 1995 in
    connection with the Bennett acquisition. As of September 28, 1996, the
    outstanding balance of this note was $8.0 million, due to the conversion
    by ThermoTrex of $34.0 million principal amount.

      The effective tax rate was 47% in fiscal 1996, compared with 46% in
    1995. The effective tax rates exceed the statutory federal income tax
    rate due primarily to the impact of state income taxes and nondeductible
    amortization of cost in excess of net assets of acquired companies.

      The Company is a defendant in certain patent litigation and has been
    notified that it allegedly infringes certain other technologies owned by
    third parties.  See Notes 3 and 11 of Notes to Consolidated Financial
    Statements. While an unfavorable outcome of one or more of these matters
    could have a material adverse effect on the Company's results of
    operations, the Company does not believe that it is reasonably likely
    that any resolution would have a material effect on the Company's
    financial position.

    Fiscal 1995 Compared With Fiscal 1994
    -------------------------------------

      Revenues increased 41% to $55.3 million in fiscal 1995 from $39.2
    million in fiscal 1994. The increase resulted from higher demand across
    all product lines, with significant growth coming from international
    sales through the Company's OEM agreement with Philips. Revenues from
    Philips were $9.8 million in fiscal 1995, compared with $4.1 million in
    fiscal 1994. Export sales accounted for 21% of the Company's revenues in
    fiscal 1995, compared with 11% in fiscal 1994.


                                       18
PAGE
<PAGE>





      The gross profit margin declined to 49% in fiscal 1995 from 50% in
    fiscal 1994, due to an adjustment to expense of $0.3 million for
    inventory revalued at the time of Bennett's acquisition.

      Selling, general and administrative expenses as a percentage of
    revenues decreased to 22% in fiscal 1995 from 25% in fiscal 1994, due
    primarily to increased revenues. Research and development expenses
    increased to $8.6 million in fiscal 1995 from $7.3 million in fiscal
    1994, reflecting the Company's continued efforts to develop and
    commercialize the full-breast digital mammography system, as well as
    enhancements of existing systems.

      The effective tax rate was 45% in fiscal 1995, compared with 55% in
    fiscal 1994. The effective tax rates exceed the statutory federal income
    tax rate due primarily to the impact of state income taxes and
    nondeductible amortization of cost in excess of net assets of acquired
    companies. The decrease in the effective tax rate in 1995 resulted from
    the lower relative impact of nondeductible amortization of cost in excess
    of net assets of acquired companies and state income taxes.

    Liquidity and Capital Resources

      Consolidated working capital was $59.8 million at September 28, 1996,
    compared with $13.2 million at September 30, 1995. Included in working
    capital are cash and cash equivalents of $34.0 million at September 28,
    1996 and $0.2 million at September 30, 1995. Net cash provided by
    operating activities was $6.0 million in fiscal 1996. In fiscal 1996, the
    Company funded an increase in accounts receivable of $7.7 million due
    primarily to September 1996 shipments of the Company's new M-IV
    mammography system.

      The Company expended $3.1 million on purchases of property, plant and
    equipment during fiscal 1996. The Company expects to expend approximately
    $6.0 million for purchases of property, plant and equipment during fiscal
    1997.

      In connection with the October 1995 acquisition of Bennett, the
    Company issued to ThermoTrex a $42.0 million principal amount 4.2%  
    subordinated convertible note. During fiscal 1996, ThermoTrex converted
    $34.0 million principal amount into 2,883,798 shares of the Company's
    common stock.

      In May 1996, the Company acquired substantially all of the assets and
    liabilities of XRE for approximately $18.5 million in cash, net of cash
    acquired and including the repayment of debt. In September 1996, the
    Company acquired substantially all of the assets and liabilities of
    Continental for approximately $18.4 million in cash, net of cash acquired
    and including the repayment of debt.

      In November 1995, January 1996 and December 1996, the Company
    completed private placements of 1,862,000, 100,000 and 300,000 shares of
    its common stock for net proceeds of $17.6 million, $1.1 million and
    $4,215,000, respectively. In July 1996, the Company sold 2,875,000 shares
    of its common stock in an initial public offering, and 871,832 shares of


                                       19
PAGE
<PAGE>





    its common stock in a concurrent rights offering, for net proceeds of
    $49.1 million. 

      Although the Company expects to have positive cash flow from its
    existing operations, the Company may require significant amounts of cash
    for any acquisition of a business or technology. The Company expects that
    it will finance any such acquisitions through a combination of internal
    funds, additional debt or equity financing, and/or short-term borrowings
    from ThermoTrex or Thermo Electron, although it has no agreement with
    these companies to ensure that funds will be available on acceptable
    terms or at all. The Company believes its existing resources are
    sufficient to meet the capital requirements of its existing operations
    for the foreseeable future.


    BUSINESS
    --------

      The Company designs, manufactures, and markets mammography equipment
    and minimally invasive stereotactic breast-biopsy systems used for the
    detection of breast cancer, as well as general radiography (X-ray)
    equipment. In addition, the Company manufactures specialized X-ray
    equipment, including imaging systems used in the diagnosis and treatment
    of coronary artery disease and other vascular conditions, and
    radiographic fluoroscopy (R/F) systems used to diagnose gastrointestinal
    (GI) disorders and other conditions.

      The Company, incorporated in September 1995 as a wholly owned
    subsidiary of ThermoTrex Corporation (ThermoTrex), consists of four
    operating units: Lorad, Bennett X-Ray Corporation (Bennett), XRE
    Corporation (XRE), and Continental X-Ray Corporation (Continental). In
    October 1995, the Company acquired all of the outstanding shares of
    capital stock of Bennett from ThermoTrex in exchange for a $42.0 million
    principal amount 4.2% subordinated convertible note (of which $8.0
    million remains outstanding). Also in October 1995, ThermoTrex
    contributed all of the assets and liabilities relating to its Lorad
    division and the development of its Sonic CT(TM) (Computed Tomography)
    system to the Company in exchange for 20,000,000 shares of the Company's
    common stock. In May 1996, the Company acquired substantially all of the
    assets and liabilities of XRE for approximately $18.5 million in cash,
    net of cash acquired and including the repayment of debt. In September
    1996, the Company acquired substantially all of the assets and
    liabilities of Continental for approximately $18.4 million in cash, net
    of cash acquired and including the repayment of debt.

      Each unit specializes in manufacturing a particular type of imaging
    equipment for different market segments. Through its Lorad division, the
    Company manufactures and markets mammography and minimally invasive
    stereotactic breast-biopsy systems, which provide a cost-effective,
    less-invasive alternative to open surgery for the biopsy of suspicious
    breast lesions. Bennett's primary product line consists of
    general-purpose X-ray equipment, but Bennett also manufactures
    mammography systems, a stereotactic breast-biopsy system, and X-ray units
    used by chiropractors and veterinarians. XRE manufactures and markets
    X-ray imaging systems used by interventional cardiologists in the
    diagnosis and treatment of blockages in coronary arteries and other

                                       20
PAGE
<PAGE>





    vessels. XRE also manufactures electrophysiology products that aid
    doctors in diagnosing and treating cardiac arrhythmia. Continental
    manufactures and markets a broad line of general-purpose and specialty
    X-ray systems, including R/F systems used to diagnose GI disorders. In
    addition, Continental manufactures electrophysiology products and
    mammography systems.

      The Company also manufactures the specialized hair-removal lasers
    purchased by its sister company, ThermoLase, another majority-owned
    subsidiary of ThermoTrex, and nondestructive testing systems, which are
    used by the military to test aircraft for stress fractures and other
    defects.

      The Company is currently developing a full-breast digital mammography
    system that is intended to be capable of higher image quality. The system
    is designed to enhance the X-ray image through software and to allow
    near-real-time analysis. The Company expects that it will be possible to
    electronically transmit these images to allow off-site analysis by
    another radiologist. The Company believes this technology may also
    provide better images of dense breast tissue, which is often found in
    younger women. The Company is currently collecting clinical data to be
    submitted with the Company's 510(k) application to the U.S. Food and Drug
    Administration (FDA), which must grant market clearance before this
    system can be sold commercially. The Company has designed its new,
    high-end conventional mammography systems so that radiologists can
    upgrade to digital technology when it becomes available. The Company
    believes that the digital imaging technology being developed for this
    system may be adaptable to its general and specialized radiography
    systems, and the Company will seek to develop applications in these
    markets. The Company is also working on a more advanced version of its
    digital technology, which incorporates a flat-panel, direct-digital
    detector and could provide still more information for earlier diagnoses.

    Breast Cancer Detection

      Mammography Systems. Most experts agree that mammography, the X-ray
      --------------------
    imaging of breast tissue, is the best method for detecting breast cancer.
    The Company designs, manufactures, and markets mammography systems that
    are generally differentiated on the basis of price and performance. The
    Company's high-end models are the recently introduced Lorad M-IV and the
    Bennett Contour. Many of the Lorad M-IV's features were developed in
    response to user demands, including the ability to be upgraded. The
    Bennett Contour offers a patented tilt C-arm that permits the system to
    tilt toward or away from the patient to aid in imaging breast tissue. The
    Company's lower-priced models are the Lorad M-III and the Bennett MF-150,
    which do not offer all of the features of the high-end models and are
    marketed to more cost-conscious customers. In addition, the Company
    offers the Lorad T-350 and the Bennett MD-5 mobile mammography systems.

      Successful imaging of dense breast tissue requires high-contrast
    images. The Company recently introduced a new proprietary High-
    Transmission Cellular (HTC)(TM) grid that, compared with existing grids,
    reduces X-ray scattering while blocking fewer primary X-rays, resulting
    in higher-contrast images with lower radiation doses. The HTC grid is


                                       21
PAGE
<PAGE>





    currently available on the Lorad M-IV and will be available on the
    Bennett Contour.

      The Company currently has prototype full-breast digital mammography
    systems in operation at Good Samaritan Hospital in New York and at the
    University of Virginia Medical Center. The Company expects to submit data
    collected using this prototype to the FDA for clearance, which is
    required before the Company can commercially market its full-breast
    digital imaging system.

      The Company is currently developing a next-generation full-breast
    digital mammography system, which would replace the film with a  
    solid-state detector capable of directly recording the X-ray image in an
    electronic format. The system is designed to substantially increase image
    contrast without a significant decrease in image resolution.

      The Company believes that demand in the market for mammography systems
    is driven primarily by technological innovation that results in better
    image quality. Although growth of the installed base has slowed, demand
    for new systems continues as older models are replaced with those
    offering technological innovations. In addition, the Company believes
    that the market outside the United States will grow as more countries
    adopt mammography quality standards similar to those recently adopted in
    the United States.

      Minimally Invasive Stereotactic Breast-biopsy Systems. Mammography is
      ------------------------------------------------------
    only one of the first steps in the diagnosis of breast cancer. If a
    mammogram reveals a suspicious lesion that cannot be identified as benign
    or malignant, the next step typically is to perform a biopsy to remove
    cells from the suspicious lesion to determine whether or not they are
    cancerous.

      Traditionally, biopsies have been performed in open surgery under
    general anesthetic. Surgical biopsies can be painful procedures, and
    surgeons generally remove a large area of breast tissue, about the size
    of a golf ball, to ensure the collection of tissue from the suspicious
    lesion. These surgeries can leave visible scarring on the breast and scar
    tissue in the breast that can make detecting cancers in future mammograms
    more difficult.

      The Company offers a variety of minimally invasive stereotactic
    breast-biopsy systems that provide an alternative to surgical biopsy.
    These stereotactic breast-biopsy systems were introduced to address the
    disadvantages of open surgical biopsy and can be performed on an
    outpatient basis under local anesthetic. These procedures generally
    remove only a small tissue sample, resulting in minimal scarring both on
    and in the breast.

      The Company offers a dedicated prone table, the StereoGuide(R), for
    customers that perform a significant number of biopsy procedures. With
    the dedicated prone table, the patient lies down with her breast
    suspended through an aperture in the table. X-ray imaging equipment and a
    needle-gun attachment (not manufactured by the Company) are mounted below
    the table. Patients on the prone table are more comfortable, increasing
    the likelihood they will remain still during the procedure, and cannot

                                       22
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    see the needle being inserted in the breast, reducing the chance of
    fainting. Recent studies indicate that stereotactic needle biopsy is
    equally effective compared with surgical biopsy in determining whether a
    suspicious lesion is malignant. The typical cost of a stereotactic needle
    biopsy procedure is approximately one third of the price for an open
    surgical biopsy. The Company's StereoGuide system is the subject of a
    lawsuit alleging infringement of a Fischer Imaging Corporation (Fischer)
    patent. See "Business - Legal Proceedings."

      The Company also offers upright, add-on systems, the StereoLoc II and
    the Cytoguide, that can be attached to most of its mammography systems.
    Add-on systems principally consist of a needle-gun attachment that fits
    onto the mammography system in place of the breast-compression paddle.
    The stereotactic images required to plot the location of the lesion are
    taken by the mammography system. These systems enhance the functionality
    of a mammography system and are beneficial to customers who have only
    periodic demand for stereotactic needle-biopsy procedures.

      The Company offers a digital spot imaging option with all of its
    stereotactic breast-biopsy systems. Although not capable of imaging the
    entire breast, digital spot imagers are capable of capturing an area
    large enough to cover a suspicious lesion. The Company's digital spot
    imaging systems can record and display an X-ray image in approximately 10
    seconds. Since the image is recorded in electronic format, a computer can
    quickly plot the location of the lesion and aim the needle gun once the
    lesion has been located with a cursor on the computer screen. A
    stereotactic breast-biopsy procedure using digital spot imaging can be
    performed in as short a time as 10 minutes, compared with a typical time
    of 45 minutes using a film-based system.

      The Company believes that the stereotactic breast-biopsy system market
    will grow as the procedure becomes more widely accepted by the medical
    community and as pressures to contain healthcare costs increase. 

    General Radiography

      The Company addresses the general radiography (X-ray) market through
    its Bennett and Continental subsidiaries. Bennett designs, manufactures,
    and markets office-based X-ray systems, which are basic systems generally
    used in medical outpatient facilities, such as doctors' offices and
    surgi-care centers. Bennett has focused on this segment of the market by
    providing low-cost, reliable systems. Bennett and Continental also
    design, manufacture, and market the more sophisticated and expensive
    radiographic systems typically used in hospitals and clinics. In
    addition, Bennett manufactures and markets imaging systems designed
    specifically for chiropractors and veterinarians.

      The U.S. market for general X-ray systems is stable, and consists
    primarily of replacement sales as customers upgrade older equipment. The
    Company believes that the international market is substantially larger
    than the U.S. market and that the installed base of systems is still
    growing, particularly in developing countries. The Company has recently
    expanded its international sales efforts. 



                                       23
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      The Company's radiographic systems typically include a generator, a
    tube stand, and a table or bucky structure to hold the film. For each of
    these components the Company offers a variety of options and features
    that can be configured to create systems with different price and
    performance characteristics. A high-end, hospital-based system may
    consist of a 60-kilowatt, high-frequency generator; a ceiling-mounted
    overhead tube crane; a four-way floating, elevating table; and an upright
    bucky stand. An office-based system may consist of a 25-kilowatt,
    high-frequency generator; a floor-mounted, free-standing tube stand; and
    an upright bucky stand. The Company's general radiography product line
    features high-frequency generators with anatomical programming and other
    operator-selected features.

      The Company offers two linear tomography systems: the Bennett BT-300
    and the Continental Precision Movement Tomography (PMT)
    radiographic/tomographic system. In a linear tomography procedure, the
    X-ray tube sweeps over the patient in one direction with the film tray
    sweeping under the patient in the opposite direction. The resulting image
    provides an unobstructed view at a desired plane within the patient's
    body, of the kidneys, for example. The Continental PMT system uses a
    patented robotic positioning system to rapidly position the equipment and
    the patient for either tomographic or general radiography procedures. The
    Company believes that for a number of applications its tomography systems
    may be a cost-effective alternative to computed tomography scanners.

      The Company believes digital imaging will have significant application
    in the general and specialized radiographic markets and that the
    technology it develops for its full-breast digital imaging system may be
    adaptable to these applications. In general X-ray applications, the
    Company believes digital imaging will produce better quality images and
    reduce operating costs by eliminating the need for film, processing
    equipment, and chemicals. In addition, digital imaging will permit the
    electronic storage of images on magnetic or optical media, as well as the
    transmission of images to multiple locations. Furthermore, the Company
    believes digital imaging could make the image intensifiers, which are
    large and expensive components in certain imaging systems, obsolete.

    Cardiac Catheterization, Angiography, and Electrophysiology

      In May 1996, the Company acquired XRE, a designer, manufacturer, and
    marketer of complete cardiac catheterization laboratories (also called
    cath labs) and positioners for cardiovascular imaging systems. XRE's
    imaging equipment is used in cath labs where angiography (examination of
    the blood vessels using X-rays following the injection of a radio-opaque
    contrast medium) is performed by an interventional cardiologist. XRE
    systems consist of a mechanical positioner, which is used to position an
    X-ray source and an image intensifier around a patient who lies prone on
    an angiographic table. The entire system is designed to provide real-time
    images of the heart and coronary arteries for physicians performing
    interventional procedures, such as a diagnostic angiogram or balloon
    angioplasty.

      Coronary artery disease is the leading cause of death in the United
    States and represents an increasing health risk throughout the world. One
    of the most common forms of cardiovascular disease is atherosclerosis,

                                       24
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    which can lead to atheroma, or a narrowing of the arteries. In addition
    to the coronary arteries, atherosclerosis can effect blood vessels in the
    brain, legs, and arteries throughout the body.

      Traditionally, angiography has been the tool of choice for diagnosing
    atherosclerosis and certain other cardiovascular diseases because it
    provides the clearest and most accurate depiction of the coronary
    arteries. Cardiac angiography is performed in a cardiac catheterization
    laboratory and involves X-ray imaging of the heart and large blood
    vessels following the injection of a radio-opaque solution into the
    patient.

      Historically, the primary form of treatment for coronary artery
    disease has been open-heart bypass surgery. However, in recent years
    significant advances have been made in the treatment of atherosclerosis
    and other coronary artery diseases without extensive surgery. A common
    alternative treatment is balloon angioplasty, a procedure in which a
    segment of a narrowed coronary artery is stretched by the inflation of a
    balloon introduced into the affected artery. A more recent development
    involves the permanent implantation of a device called a stent into the
    blood vessel in order to keep the restricted vessel open once it has been
    expanded by balloon angioplasty.

      Angioplasty and stent placement are less invasive than surgery and
    generally do not require lengthy hospitalization (typically no more than
    two days). The Company believes vascular and cardiovascular surgeons will
    increasingly use balloon angioplasty and these other less-invasive
    techniques to treat vascular diseases. These procedures are performed
    under the guidance of X-ray imaging such as that provided by the
    Company's equipment.

      XRE's products include the Unicath C cardiovascular imaging system and
    the Unicath LP biplane cardiovascular imaging system. XRE recently
    introduced the Unicath SP, its newest single-plane cardiovascular imaging
    system, with enhanced features such as a larger X-ray tube and advanced
    image intensifier with Full-Frame(TM) Zoom to further enhance the imaging
    of interventional devices such as stents.

      To complement its Unicath SP labs, XRE has developed a line of digital
    image processing systems, workstations, and archive alternatives. Each of
    these products uses an "open architecture" to facilitate connectivity
    with industry-standard networks and storage devices. XRE's new DVFX
    digital video filter system acquires, enhances, and displays
    high-resolution images at 30 frames per second to clearly image and
    freeze the motion of the heart. The Unicath SP also has XRE's exclusive
    Full-Frame Zoom feature, which further improves visualization of
    interventional devices by enlarging the presentation on TV image
    monitors.

      Many of XRE's X-ray positioners are based on its parallelogram design.
    This design permits multi-angular views of the heart and coronary
    arteries while the patient remains stationary on the table.

       Both XRE and Continental design, manufacture, and sell
    electrophysiology systems that are used in the diagnosis and treatment of

                                       25
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<PAGE>





    cardiac arrhythmia, which is characterized by the sudden, erratic beating
    of the heart and can result in cardiac arrest. Both the Continental EP
    2000 system and XRE's Unicath EP consist of a C-arm positioner, an
    elevating/tilting table, and a high-frequency X-ray generator. XRE's
    Unicath EP includes a parallelogram positioner, a similar
    elevating/tilting table, and a constant-potential generator. In addition,
    XRE offers a biplane version of Unicath EP, which provides X-ray views
    from two different angles simultaneously, thereby shortening lengthy
    electrophysiology procedures by at least half. Both XRE systems feature
    variable-rate pulsed fluoroscopy with high-performance digital imaging.

    Radiographic Fluoroscopy Systems

      Through its Continental subsidiary, acquired in September 1996, the
    Company designs, manufactures, and markets radiographic fluoroscopy
    products. An R/F system is able to record dynamic events by capturing a
    series of images in a short period of time. For example, R/F systems are
    used for various gastrointestinal procedures to image in real-time the
    progress of a radio-opaque ingested solution (typically barium) through
    the digestive tract.

      Continental produces R/F systems using advanced high-frequency
    generators that provide pulsed power, resulting in substantially reduced
    radiation exposure to the patient. Continental's R/F products include the
    new DigiSpot 2000, a high-speed digital imaging system that records the
    image in an electronic format, permitting the electronic storage of
    images on magnetic or optical media, and the transmission of images to
    multiple locations with image quality comparable with film-based systems.

    Other Products

      The Company uses its technological and manufacturing expertise to
    produce a number of other products.

      The Company's LPX-160 portable imaging system is based on the
    Company's medical imaging technology. This system is designed to produce
    high-resolution images of metals, composites, and plastics. Customers for
    this system have included the United States Air Force, several commercial
    airlines, and Canadian and American utilities.

      The Company manufactures an X-ray source that is used as a component
    to a fill-measuring device sold by Thermedics Inc., a publicly traded,
    majority-owned subsidiary of Thermo Electron. During fiscal 1996 sales of
    such devices under this arrangement totaled $361,000.

      The Company also manufactures the lasers used in ThermoLase's
    hair-removal process. ThermoLase is a publicly traded, majority-owned
    subsidiary of ThermoTrex. During fiscal 1996, sales of these lasers
    totaled $8,549,000. The Company has committed to deliver additional
    lasers to ThermoLase under this arrangement for approximately $6.4
    million. The Company anticipates that these lasers will be delivered in
    fiscal 1997.




                                       26
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<PAGE>





    Sales and Distribution

      The Company sells its products through a worldwide network of more
    than 100 independent dealers and, to a lesser extent, on a direct basis.
    Each of the Company's operating units employs regional sales managers who
    oversee the performance of the independent dealers on a domestic and
    international basis and, in certain instances, support direct sales
    efforts. The Company and its independent dealers maintain a staff of
    factory-trained service technicians to support its systems on a worldwide
    basis.

    OEM Agreements

      In addition to manufacturing and marketing its own systems, the
    Company manufactures systems and system components as an OEM for other
    medical equipment companies such as U.S. Surgical, GE, Philips, and
    Picker International. See "Business - Dependency on a Single Customer." 

    Research and Development

      The Company maintains active programs for the development of new
    mammography and X-ray imaging systems. The Company's current development
    efforts are focused on the development of a full-breast digital
    mammography system, X-ray sensors for direct-detection digital imaging
    technology, and the enhancement of existing mammography products. The
    Company believes that the digital imaging technology developed for this
    system also will be readily adaptable to general radiographic and
    diagnostic cardiac imaging systems.

      One of the Company's long-term research and development programs is
    the development of a Sonic CT system that uses acoustic waves to form
    high-resolution images of breast tissue. The Company has deferred
    spending additional resources on Sonic CT at the present time, so that it
    may concentrate its resources more directly on its digital imaging
    research and development.

      The Company is developing products based on digital imaging technology
    developed by scientists at ThermoTrex. ThermoTrex has granted the Company
    a fully paid, exclusive, worldwide, perpetual license to use such
    technology in the fields of mammography and general radiography. Under
    the terms of the license agreement with ThermoTrex, if the Company elects
    to fund approximately $6 million of the research and development in the
    fields of radiographic fluoroscopy, mobile C-arm fluoroscopy, and
    cardiography/angiography over a three-year period, the Company's license
    will be extended to cover such fields. As of September 28, 1996, the
    Company had cumulatively funded $1.8 million under the agreement.  See
    "Relationship and Potential Conflicts of Interest with Thermo Electron
    and ThermoTrex."

      Research and development expenses of the Company were $18.9 million,
    $8.6 million, and $10.7 million for fiscal 1996, the nine months ended
    September 30, 1995, and 1994, respectively.




                                       27
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    Competition

      The healthcare industry in general, and the market for imaging
    products in particular, is highly competitive. The Company competes with
    a number of companies, many of which have substantially greater
    financial, marketing, and other resources than the Company. The Company's
    competitors include large companies such as GE, Philips, Siemens,
    Toshiba, Shimadzu, and Picker International, which compete in most
    diagnostic imaging modalities, including X-ray imaging. In addition, a
    significant portion of the Company's sales are to U.S. Surgical, GE and
    Philips through OEM arrangements. The products sold through such OEM
    arrangements compete with those offered by the Company and its
    independent dealers. The Company's StereoLoc II, Cytoguide, and
    StereoGuide stereotactic breast-biopsy systems compete with products
    offered by GE, Fischer Imaging Corporation, and Philips, and with
    conventional surgical biopsy procedures. The Company competes in these
    markets primarily on the basis of product features, product performance,
    and reputation as well as price and service. The Company believes that
    competition is likely to increase as a result of healthcare
    cost-containment pressures and the development of alternative diagnostic
    and interventional technologies.  See "Risk Factors - Intense
    Competition" and "- Technological Change and New Products."

    Patents and Proprietary Technology

      The Company's policy is to protect its intellectual property rights
    and to apply for patent protection when appropriate. The Company
    currently holds numerous issued United States patents expiring at various
    dates ranging from 2003 to 2014. The Company also has more than 10
    applications pending for additional United States patents and a number of
    foreign counterparts for its patents in various foreign countries. In
    addition, the Company has registered for other trademarks. Patent
    protection provides the Company with competitive advantages with respect
    to certain systems. The Company believes, however, that technical
    know-how and trade secrets are more important to its business than patent
    protection.

      Competitors of the Company and other third parties hold issued patents
    and pending patent applications relating to imaging and other related
    technologies, and it is uncertain whether these patents and patent
    applications will require the Company to alter its products or processes,
    pay licensing fees, or cease certain activities. See "Risks Factors -
    Risks Associated With Pending and Threatened Patent Litigation" and
    "Business - Legal Proceedings."

    Government Regulation

      The Company's products and its research, development, and
    manufacturing activities are subject to regulation by numerous
    governmental authorities in the United States and other countries. In the
    United States, medical devices are subject to rigorous FDA review. The
    federal Food, Drug and Cosmetic Act, the Public Health Services Act, and
    other federal statutes and regulations govern or influence the testing,
    manufacture, safety, labeling, storage, record keeping, reporting,
    approval, advertising, and promotion of products such as those offered by

                                       28
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<PAGE>





    the Company. Noncompliance with applicable requirements can result in
    fines, recalls, or seizures of products, total or partial suspension of
    production, and criminal prosecution.

      The Company is also subject to periodic inspections by the FDA, whose
    primary purpose is to audit the Company's compliance with Good
    Manufacturing Practices (GMP). Enforcement of GMP regulations has
    increased significantly in the last several years, and the FDA has
    publicly stated that compliance will be more strictly scrutinized. In the
    event that the Company or any of its facilities was determined to be in
    noncompliance, and to the extent that the Company or such facility was
    unable to convince the FDA of the adequacy of its compliance, the FDA has
    the power to assert penalties or remedies, including a recall or
    temporary suspension of product shipments until compliance is achieved.
    Such penalties or remedies could have a material adverse effect on the
    Company's business and results of operations.

      The Company is also regulated by the FDA under the Radiation Control
    for Health and Safety Act of 1968 (Public Law 90-602), which specifically
    addresses radiation-emitting products. Under this law, the Company is
    responsible for submitting initial reports on all new X-ray systems that
    require certification to FDA performance standards. The Company must also
    submit a quality assurance and test program for FDA review to ensure
    continued compliance with X-ray performance standards.

      Historically, the Company has been subject to recalls of certain of
    its products from time to time under Public Law 90-602. Under this law,
    any product that is not in compliance with the relevant performance
    standard must be repaired, refurbished, or returned at the manufacturer's
    expense.

      The Company believes that compliance with federal, state, and local
    environmental regulations will not have a material adverse effect on its
    capital expenditures, earnings, or competitive position.  See "Risk
    Factors - Government Regulation; No Assurance of Regulatory Approval" and
    "- Healthcare Reform; Uncertainty of Patient Reimbursement."

    Backlog

      The backlog of firm orders was $71.7 million as of September 28, 1996,
    compared with $45.4 million as of September 30, 1995. The Company
    anticipates that substantially all of the backlog at September 28, 1996,
    will be shipped during fiscal 1997.

    Raw Materials

      Raw materials, components, and supplies purchased by the Company are
    either available from a number of different suppliers or from alternative
    sources that could be developed without a material adverse effect on the
    Company. To date, the Company has experienced no difficulties in
    obtaining these materials.





                                       29
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    Seasonal Influences

      There are no significant seasonal influences on the Company's sales of
    products and services.

    Working Capital Requirements

      There are no special inventory requirements or credit terms extended
    to customers that would have a material adverse effect on the Company's
    working capital.

    Dependency on a Single Customer

      Revenues from OEM sales of a modified design of the Company's
    stereotactic prone breast-biopsy system to U.S. Surgical accounted for
    11% of the Company's total revenues in fiscal 1996.

    Facilities

      The Company owns two office and manufacturing facilities: a 63,500
    square-foot facility in Danbury, Connecticut, and a 163,000 square-foot
    facility in Broadview, Illinois. The Company leases a 120,000 square-foot
    office and manufacturing facility in Copiague, New York, under a lease
    expiring in 2005, a 156,000 square-foot office and manufacturing facility
    in Littleton, Massachusetts, under a lease expiring in 2012, and a 60,000
    square foot office and manufacturing facility in Danbury, Connecticut,
    under a lease expiring in 2006.

      The Company believes that its facilities are in good condition and are
    suitable and adequate to meet current needs.

    Personnel

      As of September 28, 1996, the Company employed 992 persons.

    Legal Proceedings

      In April 1992, Fischer Imaging Corporation (Fischer) commenced a
    lawsuit in the United States District Court, District of Colorado,
    against the Company's Lorad division, alleging that Lorad's prone
    breast-biopsy system infringes a Fischer patent on a precision
    mammographic needle-biopsy system. As of September 28, 1996, the Company
    had recognized aggregate revenues of approximately $63.1 million from the
    sale of such systems, of which $34.4 million represents sales prior to
    October 1, 1995. The suit requests a permanent injunction, treble
    damages, and attorneys' fees and expenses. If the Company is unsuccessful
    in defending this lawsuit, it may be enjoined from manufacturing and
    selling its StereoGuide system without a license from Fischer. No
    assurance can be given that the Company will be able to obtain such a
    license, if required, on commercially reasonable terms, if at all. In
    addition, the Company may be subject to damages for past infringement. No
    assurance can be given as to the amount that the Company may eventually
    be required to pay in expenses or in such damages.  See "Risk Factors -
    Risks Associated With Pending and Threatened Patent Litigation."


                                       30
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      In connection with the organization of the Company, ThermoTrex agreed
    to indemnify the Company for any and all cash damages in connection with
    the Fischer lawsuit with respect to sales of the Company's products
    occurring prior to October 1995, when Lorad was transferred to the
    Company. Notwithstanding this indemnification, the Company would be
    required to report as an expense in its results of operations the full
    amount, including any reimbursable amount, of any damages in excess of
    the amount accrued (approximately $2 million as of September 28, 1996),
    with any indemnification payment it receives from ThermoTrex being
    treated as a contribution to shareholders' investment.


    RELATIONSHIP AND POTENTIAL CONFLICTS OF INTEREST
     WITH THERMO ELECTRON AND THERMOTREX

      The Company was incorporated in September 1995 as a wholly-owned
    subsidiary of ThermoTrex. ThermoTrex acquired all of the outstanding
    capital stock of Bennett in September 1995 for approximately $42,000,000
    in cash, net of cash acquired. On October 2, 1995, the Company acquired
    all of the outstanding shares of capital stock of Bennett from ThermoTrex
    in exchange for the $42,000,000 principal amount Convertible Note.
    Subsequently, on October 16, 1995, ThermoTrex contributed all of the
    assets and liabilities relating to its Lorad division and the development
    of its Sonic CT system to the Company in exchange for 20,000,000 shares
    of Common Stock of the Company. 

      Thermo Electron has adopted a strategy of selling a minority interest
    in subsidiary companies to outside investors as an important tool in its
    future development. As part of this strategy, Thermo Electron and certain
    of its subsidiaries have created publicly and/or privately held
    majority-owned subsidiaries. The Company and the other Thermo Electron
    subsidiaries are referred to herein as the "Thermo Subsidiaries." 

      In October 1995, ThermoTrex granted to the Company an exclusive,
    paid-up, royalty-free license for the use of certain technology relating
    to digital imaging detectors in the fields of mammography and general
    radiography. Under the license agreement, if the Company funds
    approximately $6 million of ThermoTrex's research and development of the
    digital imaging technology in the fields of radiographic/fluoroscopy,
    mobile C-arm fluoroscopy and cardiology/angiography over the next three
    years, then ThermoTrex will be obligated to grant the Company a
    fully-paid, exclusive, worldwide, perpetual license to use and sell the
    digital imaging technology in these fields. The license agreement
    provides that ThermoTrex will manufacture products based on the digital
    imaging technology for the Company in the applicable fields. ThermoTrex
    will sell the products to the Company at ThermoTrex's cost until the
    Company has received an amount of Net Profit (as defined below) from the
    resale of such products equal to amounts paid by the Company for research
    and development as set forth above less any additional research and
    development costs incurred by ThermoTrex with the prior written approval
    of the Company, and thereafter at ThermoTrex's cost plus one-half of Net
    Profit. For purposes of the preceding sentence, "Net Profit" means the
    difference between the prices the Company receives upon resale of such
    products and the aggregate costs of the Company and ThermoTrex relating


                                       31
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    to such sales. As of September 28, 1996, the Company had paid
    approximately $1,800,000 to ThermoTrex under this arrangement. 

      The Company has an arrangement with the Tecomet division of Thermo
    Electron for the manufacture of the Company's proprietary HTC grid. Under
    this arrangement Tecomet manufactures the grid for the Company pursuant
    to written purchase orders. The Company owns the intellectual property
    rights to the grid. During fiscal 1996, the Company purchased grids for
    an aggregate purchase price of $397,000 under this arrangement. In
    addition, the Company recorded expense of $250,000 during fiscal 1996
    related to research and development funding provided to Tecomet in
    connection with this project.

      Under an arrangement with ThermoLase, the Company manufactures the
    laser used in ThermoLase's hair-removal process. The Company manufactures
    these lasers for ThermoLase pursuant to written purchase orders. During
    fiscal 1996, the Company had sales of $8,549,000 under this arrangement.
    The Company has committed to deliver additional lasers to ThermoLase
    under this arrangement for approximately $6,400,000.

      Under an arrangement with Thermedics Detection Inc., a subsidiary of
    Thermedics Inc., a publicly-traded, majority-owned subsidiary of Thermo
    Electron, the Company manufactures an X- ray source that is used as a
    component to a fill-measuring device produced by Thermedics Detection.
    The Company manufactures these X-ray sources for Thermedics Detection
    pursuant to written purchase orders. During fiscal 1996, Thermedics
    Detection paid the Company $361,000 under this arrangement. 

      On October 2, 1995, in exchange for all of the outstanding shares of
    capital stock of Bennett, the Company issued the $42,000,000 principal
    amount Convertible Note to ThermoTrex. The Convertible Note has an
    interest rate of 4.2% per annum and is convertible into shares of the
    Company's Common Stock at a conversion price of $11.79 per share. In
    March 1996, ThermoTrex converted $3,000,000 principal amount of the
    Convertible Note into 254,452 shares of Common Stock.   In July 1996,
    ThermoTrex converted an additional $31,000,000 principal amount of the
    Convertible Note into 2,629,346 shares of Common Stock.

      ThermoTrex, in addition to providing the Company's medical imaging
    products, supplies laser-based hair-removal services and personal-care
    products through its ThermoLase subsidiary and conducts advanced
    technology research. For the fiscal year ended September 28, 1996,
    ThermoTrex had consolidated revenues of $182,029,000 and consolidated net
    income of $42,575,000.

      Thermo Electron and its subsidiaries develop, manufacture and market
    environmental monitoring and analysis instruments, biomedical products
    including heart-assist systems and respiratory care products, papermaking
    and paper-recycling equipment, alternative-energy systems, industrial
    process equipment and other specialized products. Thermo Electron and its
    subsidiaries also provide environmental and metallurgical services and
    conduct advanced technology research and development. For its fiscal year
    ended December 30, 1995, Thermo Electron had consolidated revenues of
    $2,207,417,000 and consolidated net income of $140,080,000. See "Risk


                                       32
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    Factors-Potential Conflicts of Interest" and "-Significant Additional
    Shares Eligible for Future Sale." 

    The Thermo Electron Corporate Charter

      Thermo Electron and the Thermo Subsidiaries, including the Company,
    recognize that the benefits and support that derive from their
    affiliation are essential elements of their individual performance.
    Accordingly, Thermo Electron and each of the Thermo Subsidiaries,
    including the Company, have adopted the Thermo Electron Corporate Charter
    (the "Charter") to define the relationships and delineate the nature of
    such cooperation among themselves. The purpose of the Charter is to
    ensure that (1) all of the companies and their shareholders are treated
    consistently and fairly, (2) the scope and nature of the cooperation
    among the companies, and each company's responsibilities, are adequately
    defined, (3) each company has access to the combined resources and
    financial, managerial and technological strengths of the others, and (4)
    Thermo Electron and the Thermo Subsidiaries, in the aggregate, are able
    to obtain the most favorable terms from outside parties. 

      To achieve these ends, the Charter identifies the general principles
    to be followed by the companies, addresses the role and responsibilities
    of the management of each company, provides for the sharing of group
    resources by the companies and provides for centralized administrative,
    banking and credit services to be performed by Thermo Electron. The
    services provided by Thermo Electron include collecting and managing cash
    generated by members, coordinating the access of Thermo Electron and the
    Thermo Subsidiaries (the "Thermo Group") to external financing sources,
    ensuring compliance with external financial covenants and internal
    financial policies, assisting in the formulation of long-range planning
    and providing other banking and credit services. Pursuant to the Charter,
    Thermo Electron may also provide guarantees of debt obligations of the
    Thermo Subsidiaries or may obtain external financing at the parent level
    for the benefit of the Thermo Subsidiaries. In certain instances, the
    Thermo Subsidiaries may provide credit support to, or on behalf of, the
    consolidated entity or may obtain financing directly from external
    financing sources. Under the Charter, Thermo Electron is responsible for
    ensuring that the Thermo Group remains in compliance with all covenants
    imposed by external financing sources, including covenants related to
    borrowings of Thermo Electron or other members of the Thermo Group, and
    for apportioning such constraints within the Thermo Group. In addition,
    Thermo Electron establishes certain internal policies and procedures
    applicable to members of the Thermo Group. The cost of the services
    provided by Thermo Electron to the Thermo Subsidiaries is covered under
    existing corporate services agreements between Thermo Electron and each
    of the Thermo Subsidiaries. 

      The Charter presently provides that it shall continue in effect so
    long as Thermo Electron and at least one Thermo Subsidiary participate.
    The Charter may be amended at any time by agreement of the participants.
    Any Thermo Subsidiary, including the Company, may withdraw from
    participation in the Charter upon 30 days' prior notice. In addition,
    Thermo Electron may terminate a subsidiary's participation in the Charter
    in the event the subsidiary ceases to be controlled by Thermo Electron or
    ceases to comply with the Charter or the policies and procedures

                                       33
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<PAGE>





    applicable to the Thermo Group. A withdrawal from the Charter
    automatically terminates the corporate services agreement in effect
    between the withdrawing company and Thermo Electron. The withdrawal from
    participation does not terminate outstanding commitments to third parties
    made by the withdrawing company, or by Thermo Electron or other members
    of the Thermo Group, prior to the withdrawal. However, a withdrawing
    company is required to continue to comply with all policies and
    procedures applicable to the Thermo Group and to provide certain
    administrative functions mandated by Thermo Electron so long as the
    withdrawing company is controlled by or affiliated with Thermo Electron. 

    Corporate Services Agreement

      As provided in the Charter, Thermo Electron and the Company have
    entered into a Corporate Services Agreement (the "Services Agreement")
    under which Thermo Electron's corporate staff provides certain
    administrative services, including certain legal advice and services,
    risk management, certain employee benefit administration, tax advice and
    preparation of tax returns, centralized cash management and certain
    financial and other services to the Company. In 1994 and 1995, Thermo
    Electron assessed the Company an annual fee for these services equal to
    1.25% and 1.20%, respectively, of the Company's total revenues. Effective
    January 1, 1996, the fee was reduced to 1.0% of the Company's total
    revenues. The fee may be changed by mutual agreement of the Company and
    Thermo Electron. During the fiscal year ended September 28, 1996, Thermo
    Electron assessed the Company $1,567,000 in fees under the Services
    Agreement. The Company believes that the charges under the Services
    Agreement are representative of the expenses the Company would have
    incurred on a stand-alone basis and that the terms of the Services
    Agreement are reasonable. For additional items such as employee benefit
    plans, insurance coverage and other identifiable costs, Thermo Electron
    charges the Company based upon costs attributable to the Company. The
    Services Agreement automatically renews for successive one-year terms,
    unless canceled by the Company upon 30 days' prior notice. In addition,
    the Services Agreement terminates automatically in the event the Company
    ceases to be a member of the Thermo Group or ceases to be a participant
    in the Charter. In the event of a termination of the Services Agreement,
    the Company will be required to pay a termination fee equal to the fee
    that was paid by the Company for services under the Services Agreement
    for the nine-month period prior to termination. Following termination,
    Thermo Electron may provide certain administrative services on an
    as-requested basis by the Company or as required in order to meet the
    Company's obligations under Thermo Electron's policies and procedures.
    Thermo Electron will charge the Company a fee equal to the market rate
    for comparable services if such services are provided to the Company
    following termination. 

    Master Guarantee Reimbursement Agreements

      The Company has entered into a Master Guarantee Reimbursement
    Agreement with Thermo Electron which provides that the Company will
    reimburse Thermo Electron for any costs it incurs in the event it is
    required to pay third parties pursuant to any guarantees it issues on the
    Company's behalf. ThermoTrex has entered into a similar agreement with
    Thermo Electron with regard to the Company's obligations which are

                                       34
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<PAGE>





    guaranteed by Thermo Electron. The Company has also entered into a Master
    Guarantee Reimbursement Agreement with ThermoTrex which provides that the
    Company will reimburse ThermoTrex for any costs it incurs in the event
    that ThermoTrex is required to pay Thermo Electron or any other party
    pursuant to any guarantees it issues on the Company's behalf. 

    Miscellaneous

      Currently, ThermoTrex beneficially owns 79% of the outstanding shares
    of Common Stock (excluding shares of Common Stock issuable upon the
    conversion of the Convertible Note).  ThermoTrex may convert additional
    principal amounts of the Convertible Note or purchase additional shares
    of Common Stock from time to time in the open market or directly from the
    Company. See "Risk Factors-Control by ThermoTrex." 

       
      As of September 28, 1996, $32,696,000 of the Company's cash
    equivalents were invested pursuant to a repurchase agreement with Thermo
    Electron. Under this agreement, the Company in effect lends excess cash
    to Thermo Electron, which Thermo Electron collateralizes with investments
    principally consisting of corporate notes, United States government
    agency securities, money market funds, commercial paper and other
    marketable securities, in the amount of at least 103% of such obligation.
    The Company's funds subject to the repurchase agreement are readily
    convertible into cash by the Company. The repurchase agreement earns a
    rate based on the 90-day Commercial Paper Composite Rate plus 25 basis
    points, set at the beginning of each quarter. 
        

                                   MANAGEMENT

      The directors and executive officers of the Company and their ages as
    of September 28, 1996 are as follows: 

                  Name          Age               Position
                  ----          ---               --------
                                                 PPosition
                                                  --------

         Gary S. Weinstein       38 Chairman of the Board and Director
         Anthony J.              56 Vice Chairman of the Board and
         Pellegrino                 Director
         Hal Kirshner            55 Chief Executive Officer, President
                                    and Director

         John N. Hatsopoulos     62 Vice President, Chief Financial
                                    Officer and Director
         Paul F. Kelleher        54 Chief Accounting Officer
         Elias P. Gyftopoulos    68 Director
         (2)

         Robert C. Howard        65 Director
         Earl R. Lewis           52 Director
         James W. May, Jr.       53 Director
         (1)(2)

         Hutham S. Olayan        42 Director
         (1)(2)

                                       35
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<PAGE>





         Firooz Rufeh            58 Director

         Kenneth Y. Tang         48 Director

    --------------
    (1)  Member of the Audit Committee. 
    (2)  Member of the Human Resources Committee. 

      All of the Company's directors are elected annually by the
    shareholders and hold office until their respective successors are duly
    elected and qualified. Executive officers are elected annually by the
    Board of Directors and serve at its discretion. Mr. Weinstein, Mr.
    Hatsopoulos, Mr. Kelleher, Mr. Howard, Mr. Lewis, Mr. Rufeh and Dr. Tang
    are full-time employees of Thermo Electron, ThermoTrex or other
    subsidiaries of Thermo Electron, but these individuals devote such time
    to the affairs of the Company as the Company's needs reasonably require
    from time to time. Because each of these individuals owes duties to each
    of the entities for which he serves as an officer or director, there may
    be circumstances in which such individual has a conflict of interest. See
    "Risk Factors-Potential Conflicts of Interest" and "Relationship and
    Potential Conflicts of Interest with Thermo Electron and ThermoTrex." 

      Mr. Weinstein has been Chairman of the Board and a Director of the
    Corporation since February 1996. Mr. Weinstein has also been Chairman and
    Chief Executive Officer of ThermoTrex and a Vice President of Thermo
    Electron since February 1996. Mr. Weinstein was a Managing Director of
    Lehman Brothers Inc. from 1992 until February 1996, serving most recently
    as Managing Director, head of Global Syndicate and Equity Capital Markets
    since March 1995. Prior to that appointment, Mr. Weinstein served in
    various positions at Lehman Brothers since joining the firm in 1988,
    including head of Equities in Europe, head of Equity New Issues in North
    and South America and head of Global Convertible Securities. Mr.
    Weinstein is also a Director of ThermoTrex and ThermoLase. 

      Mr. Pellegrino has been Vice Chairman of the Board and a Director of
    the Company since its inception in October 1995. Mr. Pellegrino has been
    a Senior Vice President of ThermoTrex since July 1995 and was Chairman of
    Lorad for more than five years prior to that time. Mr. Pellegrino is also
    a Director of ThermoQuest Corporation and ThermoLase. 

      Mr. Kirshner has been Chief Executive Officer, President and a
    Director of the Company since its inception in October 1995. Mr. Kirshner
    has been President of Lorad since February 1991. Prior to that time, he
    served as Chief Operating Officer and President of Electrolux Water
    Systems, Inc. 

      Mr. Hatsopoulos has been Vice President, Chief Financial Officer and a
    Director of the Company since its inception in October 1995. Mr.
    Hatsopoulos has been a Vice President and Chief Financial Officer of
    ThermoTrex since 1990, the Chief Financial Officer of Thermo Electron
    since 1988 and President of Thermo Electron since January 1997.  Mr.
    Hatsopoulos was an Executive Vice President of Thermo Electron from 1986
    until January 1997. He is also a director of Thermo BioAnalysis
    Corporation, Thermo Ecotek Corporation, Thermo Fibertek Inc., Thermo
    Instrument Systems Inc., Thermo Power Corporation, Thermo TerraTech Inc.,
    Thermo Optek Corporation, ThermoQuest Corporation, Thermo Sentron Inc.,

                                       36
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<PAGE>





    ThermoTrex and Lehman Brothers Funds, Inc., an open-end investment
    management company. 

      Mr. Kelleher has been the Chief Accounting Officer of the Company
    since its inception in October 1995. Mr. Kelleher has been Vice
    President, Finance of Thermo Electron since 1987 and served as its
    Controller from 1982 to January 1996. He is a director of ThermoLase. 

      Dr. Gyftopoulos has been a Director of the Company since its inception
    in October 1995. Dr. Gyftopoulos has been the Ford Professor of
    Mechanical Engineering and of Nuclear Engineering at the Massachusetts
    Institute of Technology for more than five years. Dr. Gyftopoulos is also
    a director of Thermo BioAnalysis Corporation, Thermo Cardiosystems Inc.,
    Thermo Electron, ThermoLase, Thermo Remediation Inc., ThermoSpectra
    Corporation and Thermo Voltek Corp. 

      Mr. Howard has been a Director of the Company since its inception in
    October 1995. Mr. Howard has been an Executive Vice President of Thermo
    Electron since 1986. He is also a Director of Thermedics Inc., Thermo
    Cardiosystems Inc., ThermoLase, Thermo Power Corporation, and ThermoTrex.

      Mr. Lewis has been a Director of the Company since its inception in
    October 1995. Mr. Lewis has been Vice President of Thermo Electron since
    September 1996 and Executive Vice President and Chief Operating Officer
    of Thermo Instrument Systems Inc. since December 1995 and served as a
    Vice President of that company from 1990 to 1995. He has also served as
    Chief Executive Officer, President and a Director of Thermo Optek
    Corporation since August 1995, and President of Thermo Jarrell Ash
    Corporation for more than five years. Mr. Lewis is also Chairman of the
    Board and a Director of ThermoSpectra Corporation. 

      Dr. May has been a Director of the Company since February 1996. He has
    been Professor of Surgery at Harvard Medical School since 1994 and was
    Associate Clinical Professor of Surgery for more than five years prior to
    that time. 

      Ms. Olayan has been a Director of the Company since February 1996. She
    has served as President and a director of Olayan America Corporation
    since 1995 and Competrol Real Estate Limited since 1986, which are
    members of the Olayan Group engaged in advisory services and private real
    estate investments, respectively. Ms. Olayan also served as President and
    a director of Crescent Diversified Limited, another member of the Olayan
    Group engaged in private investments, from 1985 until 1994. Ms. Olayan is
    also a Director of Thermo Electron. 

      Mr. Rufeh has been a Director of the Company since its inception in
    October 1995 and was its Chairman of the Board from October 1995 to
    February 1996. Mr. Rufeh has been the President of ThermoTrex since 1988
    and a Vice President of Thermo Electron since January 1986. From 1985 to
    1990, he was Chairman of the Board of Thermo Power Corporation. He is
    also a Director of ThermoTrex and ThermoLase. 

      Dr. Tang has been a Director of the Company since its inception in
    October 1995. Dr. Tang has been Senior Vice President of ThermoTrex for


                                       37
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<PAGE>





    more than five years and was President of ThermoLase from December 1992
    to May 1995. He is also a director of ThermoLase. 

    Compensation of Directors

      Directors who are not employees of the Company, Thermo Electron or any
    other companies affiliated with Thermo Electron (also referred to as
    "outside directors") receive an annual retainer of $2,000 and a fee of
    $1,000 per day for attending regular meetings of the Board of Directors
    and $500 per day for participating in meetings of the Board of Directors
    held by means of conference telephone and for participating in certain
    meetings of committees of the Board of Directors. Payment of director
    fees is made quarterly. Messrs. Weinstein, Pellegrino, Kirshner,
    Hatsopoulos, Howard, Lewis and Rufeh and Dr. Tang are employees of
    members of the Thermo Electron companies and do not receive any cash
    compensation from the Company for their services as directors. Directors
    are also reimbursed for reasonable out-of-pocket expenses incurred in
    attending such meetings. 

      Directors Deferred Compensation Plan.  Under the Company's Deferred
      ------------------------------------
    Compensation Plan for Directors (the "Deferred Compensation Plan"), a
    director has the right to defer receipt of his or her fees until he or
    she ceases to serve as a director, dies or retires from his or her
    principal occupation. In the event of a change in control or proposed
    change in control of the Company that is not approved by the Board of
    Directors, deferred amounts become payable immediately. For purposes of
    the Deferred Compensation Plan, a change of control is defined as: (a)
    the occurrence, without the prior approval of the Board of Directors, of
    the acquisition, directly or indirectly, by any person of 50% or more of
    the outstanding Common Stock or the outstanding common stock of
    ThermoTrex or 25% or more of the outstanding common stock of Thermo
    Electron or (b) the failure of the persons serving on the Board of
    Directors immediately prior to any contested election of directors or any
    exchange offer or tender offer for the Common Stock or the common stock
    of ThermoTrex or Thermo Electron to constitute a majority of the Board of
    Directors at any time within two years following any such event. Amounts
    deferred pursuant to the Deferred Compensation Plan are valued at the end
    of each quarter as units of Common Stock. When payable, amounts deferred
    may be disbursed solely in shares of Common Stock accumulated under the
    Deferred Compensation Plan. The Company has reserved 25,000 shares under
    this Plan. As of the date of this Prospectus, 24 units had been
    accumulated under the Deferred Compensation Plan. 

      Directors Stock Option Plan.  The Company has adopted a directors
      ---------------------------
    stock option plan (the "Plan") providing for the grant of stock options
    to purchase shares of Common Stock to outside directors as additional
    compensation for their service as directors. The Plan provides for the
    grant of stock options upon a Director's initial appointment and,
    beginning in 2000, awards options to purchase 1,000 shares annually to
    eligible directors, provided the Common Stock is then publicly traded. A
    total of 200,000 shares of Common Stock have been reserved for issuance
    under the Plan. 

      Under the Plan, each eligible director and each new outside director
    initially joining the Board of Directors in 1996 will be granted an

                                       38
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<PAGE>





    option to purchase 40,000 shares of Common Stock upon the later of the
    adoption of the plan or the director's appointment or election. The size
    of the award to new directors appointed to the Board of Directors after
    1996 will be reduced by 10,000 shares in each subsequent year. Directors
    initially joining the Board of Directors after 1999 would not receive an
    option grant upon their appointment or election to the Board of
    Directors, but would be eligible to participate in the annual option
    awards described below. Options evidencing initial grants to directors
    are presently exercisable, however,  the shares acquired upon exercise
    are subject to restrictions on transfer and the right of the Company to
    repurchase such shares at the exercise price in the event the director
    ceases to serve as a director of the Company or any other Thermo Electron
    company. In such event, the restrictions and repurchase rights shall
    lapse or be deemed to have lapsed in annual installments of 10,000 shares
    per year, starting with the first anniversary of the date of grant,
    provided the director has continuously served as a director of the
    Company, Thermo Electron or any subsidiary of Thermo Electron since the
    grant date. These options expire on the fifth anniversary of the grant
    date, unless the director dies, ceases to be an eligible director or
    otherwise ceases to serve as a director of the Company, Thermo Electron
    or any subsidiary of Thermo Electron prior to that date. 

      Commencing in 2000, eligible directors will also receive an annual
    grant of options to purchase 1,000 shares of Common Stock, provided the
    Common Stock is then publicly traded. The annual grant would be made at
    the close of business on the date of each annual meeting of shareholders
    of the Company to each outside director then holding office, commencing
    with the annual meeting to be held in 2000. Options evidencing annual
    grants may be exercised at any time from and after the six-month
    anniversary of the date of grant and prior to the expiration of the
    option on the third anniversary of the date of grant. Shares acquired
    upon exercise of the options would be subject to repurchase by the
    Company at the exercise price if the recipient ceased to serve as a
    director of the Company or any other Thermo Electron company prior to the
    first anniversary of the date of grant for any reason other than death. 

      The exercise price for options granted under the Plan is determined by
    the average of the closing prices reported by the American Stock Exchange
    (or such other principal exchange on which the Common Stock is then
    traded) for the five trading days immediately preceding and including the
    date the option is granted or, if the shares underlying the option were
    not so traded, at the last price paid per share by independent investors
    in an arms' length transaction with the Company prior to the date of
    grant. 

      Grants of stock options to outside directors have consisted of 40,000
    shares granted in November 1995 at an exercise price of $10.25 per share
    and 80,000 shares granted in February 1996 at an exercise price of $10.75
    per share. 

    Certain Transactions

      On November 22, 1995, November 30, 1995 and January 31, 1996, the
    Company completed private placements primarily to outside investors of
    minority investments in its Common Stock at purchase prices of $10.25 per

                                       39
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<PAGE>





    share in the November 1995 private placements and $10.75 per share in the
    January 1996 private placement. Crescent International Holdings Ltd.
    purchased an aggregate of 200,000 shares of the Common Stock of the
    Company in such private placements. Crescent  International Holdings Ltd.
    is indirectly controlled by Suliman S. Olayan, the father of Hutham S.
    Olayan, a Director of the Company.  Ms. Olayan disclaims beneficial
    ownership of the shares owned by Crescent International Holdings Ltd. In
    addition, the following directors and officers purchased the number of
    shares of the Company's Common Stock set forth below in such private
    placements: Anthony J. Pellegrino, Vice Chairman and Director, 20,000
    shares; Hal Kirshner, Chief Executive Officer, President and Director,
    100,000 shares; Robert C. Howard, Director, 2,500 shares; Firooz Rufeh,
    Director, 19,600 shares; and Kenneth Y. Tang, Director, 1,200 shares. 


    EXECUTIVE COMPENSATION

    Compensation of Executive Officers

     Summary Compensation Table
     --------------------------

      The following table summarizes compensation for services to the
    Company in all capacities awarded to, earned by or paid to the Company's
    Chief Executive Officer for the last full fiscal year ended September 28,
    1996 ("fiscal 1996"),  for the nine-month period from January 1, 1995 to
    September 30, 1995 ("fiscal 1995"), reflecting a change in the
    Corporation's fiscal year end to September 30, and for the preceding full
    fiscal year from January 2, 1994 to December 31, 1994 ("Fiscal 1994"). No
    other executive officer of the Company met the definition of "highly
    compensated" within the meaning of the Securities and Exchange
    Commission's executive compensation disclosure rules during these
    periods. 

      The Company is required to appoint certain executive officers and
    full-time employees of Thermo Electron as executive officers of the
    Company in accordance with the Thermo Electron Corporate Charter. The
    compensation for these executive officers is determined and paid entirely
    by Thermo Electron. The time and effort devoted by these individuals to
    the Company's affairs is provided to the Company under the Services
    Agreement between the Company and Thermo Electron. Accordingly, the
    compensation for these individuals is not reported in the following
    table. See "Relationship and Potential Conflicts of Interest with Thermo
    Electron and ThermoTrex." 

                           Summary Compensation Table
                                 Annual      Long-Term
                             Compensation   Compensatio
                                                 n

                                                 Securities
         Name and     Fisca                     Underlying    All Other
        Principal       l     Salary    Bonus    Options(3) Compensation(
         Position     Year                                       4)



                                       40
PAGE
<PAGE>





    Hal Kirshner
    Chief Executive
    Officer  and       1996  $192,500    -- (1) 150,000(TXM)   $9,958 (5)
    President.......                                150(TMO)

                       1995            $200,000     --          7,005
                             150,000(2)
                       1994   200,000   180,000                 6,750    
                                                 22,500(TMO)

    --------------
    (1)  Compensation for executive officers is reviewed and determined
         annually at the end of each calendar year. Accordingly, bonuses have
         not yet been determined for fiscal 1996.
    (2)  Salary data for fiscal 1995 reflects salary paid during the
         nine-month period from January 1, 1995 to September 30, 1995, as a
         result of the change in the Company's fiscal year-end. 
    (3)  In addition to receiving options to purchase Common Stock
         (designated in the table as TXM), Mr. Kirshner was granted options
         to purchase shares of the common stock of Thermo Electron
         (designated in the table as TMO). Information with respect to
         options to purchase the common stock of Thermo Electron reflect a
         three-for-two split effected in May 1996 in the form of a 50% stock
         dividend. 
    (4)  Represents the amount of matching contributions made by the
         individual's employer on behalf of the Chief Executive Officer under
         the Thermo Electron 401(k) plan. 
    (5)  In addition to the matching contribution referred to in footnote
         (4), such amount includes $4,614, representing the market value of
         115 shares of Thermo Electron common stock received by Mr. Kirshner
         in May 1996 in recognition of his managerial achievements at Thermo
         Electron's Annual Management Conference.

    Stock Options Granted During Fiscal 1996
    ----------------------------------------

      The following table sets forth certain information concerning grants
    of stock options made during fiscal 1996 to the Chief Executive Officer.
    It has not been the Company's policy in the past to grant stock
    appreciation rights, and no such rights were granted during fiscal 1996. 

                       Option Grants in Last Fiscal Year


                                                          Potential
                             % of                         Realizable
                Number of    Total                     Value at Assumed
                  Shares    Options Exercis              Annual Rates
                Underlying  Granted    e                of Stock Price
                 Options      to      PriceExpiratio   Appreciation for
          Name Granted (1) Employees  Per    n Date    Option Term (2)
                                              -
                           in Fiscal Share
                             Year

                                                          5%        10%



                                       41
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<PAGE>





     Hal
     Kirshn  150,000 (TXM)   15%    $11.00  3/26/08    $1,312,500$3,528,000
     er

              150 (TMO)(3)  .01%     42.79  5/22/99         1,011     2,124
    _______
    (l)  The options to purchase shares of the Common Stock of the Company
         are presently exercisable, however, the shares acquired upon
         exercise are subject to repurchase by the granting corporation at
         the exercise price if the optionee ceases to be employed by the
         granting corporation or another Thermo Electron company.  The
         repurchase rights are deemed to lapse 20% per year commencing on the
         fifth anniversary of the grant date. The granting corporation may
         exercise its repurchase rights within six months after the
         termination of the optionee's employment. The granting corporation
         may permit the holders of all options to exercise options and
         satisfy tax withholding obligations by surrendering shares equal in
         fair market value to the exercise price or withholding obligation. 
    (2)  The amounts shown on this table represent hypothetical gains that
         could be achieved for the respective options if exercised at the end
         of the option term. These gains are based on assumed rates of stock
         appreciation of 5% and 10%, compounded annually from the date the
         respective options were granted to their expiration date. The gains
         shown are net of the option exercise price, but do not include
         deductions for taxes or other expenses associated with the exercise.
         Actual gains, if any, on stock option exercises will depend on the
         future performance of the Common Stock, the optionholders' continued
         employment through the option period and the date on which the
         options are exercised. 
    (3)  These options were granted as a part of Thermo Electron's stock
         option program, and have the same terms as stated in footnote (1),
         except that the options have a three-year term and the repurchase
         rights lapse in their entirety on the second anniversary of the
         grant date. 

    Stock Options Exercised During Fiscal Year 1996 and Fiscal Year-End
    -------------------------------------------------------------------
    Option Values
    --------------

      The following table sets forth certain information concerning each
    exercise of a stock option during fiscal 1996 and outstanding stock
    options held at the end of fiscal 1996 by the Chief Executive Officer. No
    stock appreciation rights were exercised or outstanding during fiscal
    1996. 

                Aggregated Option Exercises in Last Fiscal Year
                       and Fiscal Year-End Option Values

                                                Number of      Value of
                                                 Shares       Unexercised
                                               Underlying    In-the-Money
                                               Unexercised    Options at
                                               Options at       Fiscal
                                                 Fiscal        Year-End
                                                Year-End


                                       42
PAGE
<PAGE>





                           Number
                         of Shares
                          Acquired   Value    Exercisable/   Exercisable/
      Name     Company       on    Realized  Unexercisable(1 Unexercisable
                          Exercise                  )

    Hal
    Kirshne Trex Medical     -        -         150,000/0   $1,387,500/-
    r
            ThermoTrex     76,500 $2,079,270     73,000/0    1,809,155/-
            ThermoLase       -        -          36,400/0      787,150/-

            Thermo           -        -         116,025/0    2,953,132/-
            Electron

    -------
    (l)  All of the options reported outstanding at the end of the fiscal
         year are immediately exercisable.   In all cases, the shares
         acquired upon exercise of the options reported in the table are
         subject to repurchase by the granting corporation at the exercise
         price if the optionee ceases to be employed by such corporation or
         another Thermo Electron company. The granting corporation may
         exercise its repurchase rights within six months after the
         termination of the optionee's employment. For publicly traded
         companies, the repurchase rights generally lapse ratably over a five
         to ten year period, depending on the option term, which may vary
         from seven to twelve years, provided that the optionee continues to
         be employed by the granting corporation or another Thermo Electron
         company. 
    (2)  Options to purchase 22,500 shares of the common stock of Thermo
         Electron granted to Mr. Kirshner are subject to the same terms
         described in footnote (1), except that the repurchase rights of the
         granting corporation generally do not lapse until the tenth
         anniversary of the grant date. In the event of the employee's death
         or involuntary termination prior to the tenth anniversary of the
         grant date, the repurchase rights of the granting corporation shall
         be deemed to have lapsed ratably over a five-year period commencing
         with the fifth anniversary of the grant date. 

    Employment Agreements

      In connection with the acquisition of the LORAD Corporation ("LORAD")
    in November 1992, the Company entered into an employment agreement with
    Mr. Hal Kirshner. Mr. Kirshner's agreement called for Mr. Kirshner to
    serve as President and Chief Operating Officer of LORAD until December
    31, 1995, at a base salary of $200,000 per year plus bonus. 


    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

    Principal Stockholder

      The following table sets forth certain information regarding the
    beneficial ownership of the Common Stock of the Company as of September
    28, 1996 by ThermoTrex, which is the only person or entity that owns


                                       43
PAGE
<PAGE>





    beneficially more than 5% of the outstanding shares of Common Stock. See
    "Risk Factors-Control by ThermoTrex." 
                                                     Percentage of
                                       Number of      Outstanding
    Name and Address of Beneficial      Shares           Shares
                 Owner               Beneficially     Beneficially
                                     -
                                                    Beneficially
                                         Owned           Owned

    ThermoTrex Corporation (1)  ....23,562,339 (2)        79%
    10455 Pacific Center Court
    San Diego, CA 92121
    ________
    (l)  ThermoTrex is a majority-owned subsidiary of Thermo Electron and,
         therefore, Thermo Electron may be deemed a beneficial owner of the
         shares of Common Stock beneficially owned by ThermoTrex. Thermo
         Electron disclaims beneficial ownership of these shares.
    (2)  Includes 678,561 shares of Common Stock issuable upon conversion of
         the Convertible Note. 

      ThermoTrex has adopted a stock option plan with respect to the Common
    Stock that it beneficially owns. Under this plan, options to purchase up
    to 400,000 shares of such stock may be granted to any person within the
    discretion of the human resources committee of the Board of Directors of
    ThermoTrex, including officers and key employees of ThermoTrex. 

    Management

      The following table sets forth certain information regarding the
    beneficial ownership of the Common Stock of the Company as of September
    28, 1996 as well as information regarding the beneficial ownership of the
    common stock of ThermoTrex and Thermo Electron, as of September 28, 1996,
    with respect to (i) each of the Company's directors, (ii) the Chief
    Executive Officer, and (iii) all directors and executive officers of the
    Company as a group. 

      While certain directors and executive officers of the Company are also
    directors and executive officers of ThermoTrex or its subsidiaries other
    than the Company, all such persons disclaim beneficial ownership of the
    shares of Common Stock owned by ThermoTrex.

                                Trex Medical   ThermoTrex   Thermo Electron
              Name(1)           Corporation(2Corporation(3) Corporation
                     Corporation (4)                                    (4)
                                      )

    Gary S. Weinstein           315,000       110,000        150,412
    Anthony J. Pellegrino       146,472       930,621        115,875

    Hal Kirshner                285,000       92,968         117,184
    Elias P. Gyftopoulos        40,000        4,500          71,070
    John N. Hatsopoulos         40,383        5,423          556,059

    Robert C. Howard            43,674        35,554         192,685
    Earl L. Lewis               40,500        420            131,914
    James W. May, Jr.           40,000        0              0


                                       44
PAGE
<PAGE>





    Hutham S. Olayan            45,024        9,500          23,799

    Firooz Rufeh                83,600        101,788        134,263
    Kenneth Y. Tang             48,706        79,203         26,204
    All directors and executive
    officers as a group (12     1,134,359     1,380,377      1,664,367
    persons)  ..................

    _______

    (l)  Except as reflected in the footnotes to this table, shares of Common
         Stock and common stock of ThermoTrex and Thermo Electron
         beneficially owned consist of shares owned by the indicated person
         or by that person for the benefit of minor children, and all share
         ownership involves sole voting and investment power. 

    (2)  Shares of the Common Stock beneficially owned by all directors and
         executive officers as a group exclude 23,562,339 shares beneficially
         owned by ThermoTrex, as to which each director and executive officer
         and all members of such group disclaim beneficial ownership.  Shares
         of the Common Stock beneficially owned by Mr. Weinstein, Mr.
         Pellegrino, Mr. Kirshner, Dr. Gyftopoulos, Mr. Hatsopoulos, Mr.
         Howard, Mr. Lewis, Dr. May, Ms. Olayan, Mr. Rufeh, Dr. Tang and all
         directors and executive officers as a group include 300,000, 40,000,
         150,000, 40,000, 40,000, 40,000, 40,000, 40,000, 40,000, 40,000,
         40,000 and 816,000 shares respectively, that such person or group
         has the right to acquire within 60 days of September 28, 1996,
         through the exercise of stock options.  Shares beneficially owned by
         Ms. Olayan and by all directors and executive officers as a group
         include 24 shares allocated through September 28, 1996 to Ms.
         Olayan's account maintained pursuant to the Company's deferred
         compensation plan for directors.  Shares beneficially owned by Ms.
         Olayan do not include 200,000 shares owned by Crescent International
         Holdings Ltd., a member of the Olayan Group. Crescent International
         Holdings Ltd. is indirectly controlled by Suliman S. Olayan, Ms.
         Olayan's father. Ms. Olayan disclaims beneficial ownership of the
         shares owned by Crescent International Holdings Ltd.  Shares
         beneficially owned by Mr. Rufeh include 19,600 shares held in a
         family trust.  No director or executive officer beneficially owned
         more than 1% of the Common Stock outstanding as of September 28,
         1996, other than Mr. Weinstein who beneficially owned approximately
         1.0% of such Common Stock; and all directors and executive officers
         as a group beneficially owned 3.8% of the Common Stock outstanding
         as of such date. 

    (3)  Shares of the common stock of ThermoTrex beneficially owned by Mr.
         Weinstein, Mr. Pellegrino, Mr. Kirshner, Dr. Gyftopoulos, Mr.
         Hatsopoulos, Mr. Howard, Ms. Olayan, Mr. Rufeh, Dr. Tang and by all
         directors and executive officers as a group include 100,000,
         134,500, 73,000, 4,500, 2,100, 31,320 4,500, 66,000, 63,318 and
         489,638 shares, respectively, that such person or group has the
         right to acquire within 60 days of September 28, 1996, through the
         exercise of stock options. Shares beneficially owned by Mr.
         Pellegrino include 10,408 shares held in a trust of which Mr.
         Pellegrino's spouse is the trustee. No director or executive officer

                                       45
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<PAGE>





         beneficially owned more than 1% of the common stock of ThermoTrex
         outstanding as of September 28, 1996, other than Mr. Pellegrino, who
         beneficially owned approximately 4.8% of such common stock; all
         directors and executive officers as a group beneficially owned 7.0%
         of such common stock outstanding as of such date. 

    (4)  The shares of common stock of Thermo Electron have been adjusted to
         reflect a three-for-two stock split effected in May 1996 in the form
         of a 50% stock dividend. Shares of the common stock of Thermo
         Electron beneficially owned by Mr. Weinstein, Mr. Pellegrino, Mr.
         Kirshner, Dr. Gyftopoulos, Mr. Hatsopoulos, Mr. Howard, Mr. Lewis,
         Ms. Olayan, Mr. Rufeh, Dr. Tang and by all directors and executive
         officers as a group include 150,075, 115,875, 116,025, 9,375,
         429,685, 47,361, 126,937, 9,375, 90,560, 23,850 and 1,216,692
         shares, respectively, that such person or group has the right to
         acquire within 60 days of September 28, 1996, through the exercise
         of stock options.  Shares beneficially owned by Ms. Olayan and by
         all directors and executive officers as a group include 14,424
         shares allocated through September 28, 1996 to Ms. Olayan's account
         maintained pursuant to Thermo Electron's deferred compensation plan
         for directors.  Shares beneficially owned by Mr. Hatsopoulos, Mr.
         Howard, Mr. Lewis, Mr. Rufeh, Dr. Tang and by all directors and
         executive officers as a group include 1,225, 1,963, 617, 1,142, 538
         and 6,713 full shares, respectively, allocated through January 1,
         1996 to their respective accounts maintained pursuant to Thermo
         Electron's Employee Stock Ownership Plan of which the trustees who
         have investment power over its assets are executive officers of
         Thermo Electron. Shares beneficially owned by Ms. Olayan do not
         include 4,384,500 shares owned by Crescent Holding GmbH, a member of
         the Olayan Group. Crescent Holding GmbH is indirectly controlled by
         Suliman S. Olayan, Ms. Olayan's father. Ms. Olayan disclaims
         beneficial ownership of the shares owned by Crescent Holding GmbH.
         No director or executive officer beneficially owned more than 1% of
         the common stock of Thermo Electron outstanding as of September 28,
         1996; all directors and executive officers as a group beneficially
         owned  1.1% of the common stock of Thermo Electron outstanding as of
         September 28, 1996. 


    SELLING SHAREHOLDERS

       The following table shows the names of the Selling Shareholders, the
    number of shares of the Company's Common Stock each owned, the number of
    shares that may be offered by each of them pursuant to this Prospectus
    and the number of Shares each will own after completion of the offering,
    assuming all of the Shares being offered hereby are sold.
       

                                       Shares of
                                      Common Stock Shares  Shares Owned
                                      Owned Prior  Being       after
             Selling Shareholder         to the    Offered Completion of
                                      Offering(1)          the Offering

         Wessel Corporation N.V.          100,000   100,000           0 

                                       46
PAGE
<PAGE>





         Thermo Opportunity Fund,         114,600    50,000      64,600
        Inc.

         Primespecial                      38,000    20,000      18,000 
         John D. Bryan                     22,000    20,000       2,000
         Union Bancaire Privee             18,000    18,000           0 

         Robert E. Kirby                   15,000    15,000           0 
         Yiska Moser Trust                 15,000    15,000           0 
         George & Elizabeth Harvey         10,000    10,000           0 

         Myles Tanenbaum                   10,000    10,000           0 
         Frank Argano                      10,000    10,000           0 
         Joseph N. Cunningham              10,000    10,000           0 

         Howard Blitman                    10,000    10,000           0 
         Gestielle B                        5,000     5,000           0 
         BCI Dollar Equity                 10,000     5,000       5,000 

         Gestielle America                  2,000     2,000           0 


        

    (1)  Except as otherwise reflected in the footnotes to this table, all
         share ownership includes Shares owned by the Selling Shareholders
         and shares that the Selling Shareholders have the right to acquire
         within 60 days of September 28, 1996, through the exercise of stock
         options.

       The Shares are being registered to permit public secondary trading of
    the Shares from time to time by the Selling Shareholders.  All of the
    Shares being offered by the Selling Shareholders were sold by the Company
    in private placement transactions pursuant to Stock Purchase Agreements
    with the Company dated December 19, 1996  (collectively, the "Purchase
    Agreements").

       In the Purchase Agreements, the Company agreed, among other things,
    to bear all expenses (other than underwriting discounts, selling
    commissions, and fees and expenses of counsel and other advisors to the
    Selling Shareholders) in connection with the registration and sale of the
    Shares being offered by the Selling Shareholders. See "Sale of Shares."
    The Company has agreed to prepare and file such amendments and
    supplements to the Registration Statement of which this Prospectus forms
    a part as may be necessary to keep the Registration Statement effective
    until all the Shares offered hereby have been sold pursuant thereto or
    until such Shares are no longer, by reason of Rule 144(k) under the
    Securities Act or any other rule of similar effect, required to be
    registered for the public sale thereof by the Selling Shareholders.


                                 SALE OF SHARES

       The Company has been advised that the Selling Shareholders may sell
    Shares from time to time in transactions on the American Stock Exchange,

                                       47
PAGE
<PAGE>





    in negotiated transactions, through the writing of options on the Shares,
    or a combination of such methods of sale, at fixed prices which may be
    changed, at market prices prevailing at the time of sale, at prices
    related to such prevailing market price or at negotiated prices.  The
    Selling Shareholders may effect such transactions by selling the Shares
    to or through broker-dealers, and such broker-dealers may receive
    compensation in the form of discounts, concessions or commissions from
    the Selling Shareholders and/or the purchasers of the Shares for whom
    such broker-dealers may act as agent or to whom they sell as principal,
    or both (which compensation to a particular broker-dealer might be in
    excess of customary commissions).

       The Selling Shareholders and any broker-dealers who act in connection
    with the sale of Shares hereunder may be deemed to be "underwriters" as
    that term is defined in the Securities Act, and any commissions received
    by them and profit on any resale of the Shares as principal might be
    deemed to be underwriting discounts and commissions under the Securities
    Act.  The Company has agreed to indemnify the Selling Shareholders
    against certain liabilities, including liabilities under the Securities
    Act as underwriter or otherwise.


    DESCRIPTION OF CAPITAL STOCK

      As of December 20, 1996, the Company had 50,000,000 shares of Common
    Stock authorized for issuance, of which 28,892,630 were issued and
    outstanding. Each share of Common Stock is entitled to pro rata
    participation in distributions upon liquidation and to one vote on all
    matters submitted to a vote of shareholders. Dividends may be paid to the
    holders of Common Stock when and if declared by the Board of Directors
    out of funds legally available therefor. Holders of Common Stock have no
    preemptive, subscription, redemption, conversion or similar rights. The
    outstanding shares of Common Stock are, and the shares offered hereby
    when issued will be, legally issued, fully paid and nonassessable. 

      The shares of Common Stock have noncumulative voting rights. As a
    result, the holders of more than 50% of the shares voting can elect all
    the directors if they so choose, and in such event, the holders of the
    remaining shares cannot elect any directors. Upon completion of the
    Offerings, ThermoTrex will continue to beneficially own at least a
    majority of the outstanding Common Stock, and will have the power to
    elect all of the members of the Company's Board of Directors. ThermoTrex
    is a majority-owned subsidiary of Thermo Electron and, therefore, Thermo
    Electron may be deemed a beneficial owner of the shares of Common Stock
    beneficially owned by ThermoTrex. Thermo Electron disclaims beneficial
    ownership of these shares. 

      The Company's Certificate of Incorporation contains certain provisions
    permitted under the General Corporation Law of Delaware relating to the
    liability of directors. These provisions eliminate a director's liability
    for monetary damages for a breach of fiduciary duty, except in certain
    circumstances involving wrongful acts, such as the breach of a director's
    duty of loyalty or acts or omissions which involve intentional misconduct
    or a knowing violation of law. The Company's By-Laws also contains
    provisions to indemnify the directors and officers of the Company to the

                                       48
PAGE
<PAGE>





    fullest extent permitted by the General Corporation Law of Delaware. The
    Company believes that these provisions will assist the Company in
    attracting and retaining qualified individuals to serve as directors and
    officers. 

      The transfer agent and registrar for the Common Stock is American
    Stock Transfer & Trust Company. 


    SHARES ELIGIBLE FOR FUTURE SALE

       There are currently 28,892,630 shares of Common Stock outstanding of
    which 6,008,832 are freely tradable without restriction or further
    registration under the Securities Act, except for any shares purchased by
    affiliates of the Company as that term is defined in Rule 144 under the
    Securities Act.

       The remaining 22,883,798 outstanding shares of Common Stock are owned
    by ThermoTrex. ThermoTrex may sell its shares of Common Stock in an
    offering registered under the Securities Act or pursuant to an exemption
    from such registration, such as that provided by Rule 144 under the
    Securities Act. So long as ThermoTrex is able to elect a majority of the
    Board of Directors it will be able to cause the Company at any time to
    register under the Securities Act all or a portion of the Common Stock
    owned by ThermoTrex or its affiliates, in which case it would be able to
    sell such shares without restriction upon effectiveness of the
    registration statement. 

      In general, under Rule 144 as currently in effect, a stockholder,
    including an affiliate, who has beneficially owned his or her restricted
    securities (as that term is defined in Rule 144) for at least two years
    from the later of the date such securities were acquired from the Company
    or (if applicable) the date they were acquired from an affiliate, is
    entitled to sell, within any three-month period, a number of such shares
    that does not exceed the greater of (i) 1% of the then outstanding shares
    of Common Stock (approximately 288,926 shares) or (ii) the average weekly
    trading volume in the Common Stock during the four calendar weeks
    preceding the date on which notice of such sale was filed pursuant to
    Rule 144 provided certain requirements concerning availability of public
    information, manner of sale and notice of sale are satisfied. In
    addition, under Rule 144(k), if a period of at least three years has
    elapsed between the later of the date restricted securities were acquired
    from the Company or (if applicable) the date they were acquired from an
    affiliate of the Company, a stockholder who is not an affiliate of the
    Company at the time of sale and has not been an affiliate of the Company
    for at least three months prior to the sale is entitled to sell the
    shares immediately without compliance with the foregoing requirements
    under Rule 144. The Securities and Exchange Commission has proposed an
    amendment to Rule 144 which would reduce the holding period required for
    shares subject to Rule 144 to become eligible for sale in the public
    market from two years to one year, and from three years to two years in
    the case of Rule 144(k). 

      The Company has reserved 1,925,000 shares of Common Stock for grants
    under its existing stock-based compensation plans. As of September 28,

                                       49
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<PAGE>





    1996 the Company had options outstanding to purchase up to 1,381,000
    shares of Common Stock to certain of its employees, officers and
    directors at a weighted average exercise price of $11.14 per share. All
    of such shares are currently exercisable.  Once exercised, the shares
    acquired upon exercise are subject to the right of the Company to
    repurchase shares at the exercise price if the optionee ceases to be
    employed by the Company. This repurchase right lapses ratably (on an
    annual basis) over a five to ten year period depending upon the term of
    the option. As of September 28, 1996, the repurchase right had lapsed as
    to no shares issuable upon exercise of outstanding options. The Company
    has reserved 543,976 shares for future grants under plans. The Company
    intends to file registration statements under the Securities Act to
    register all shares of Common Stock issuable under such plans. Shares
    covered by these registration statements that are not subject to
    transferability restrictions will be eligible for sale in the public
    market immediately upon the filing of such registration statements,
    subject to Rule 144 limitations applicable to affiliates as noted above. 

      Sales of significant numbers of shares of the Common Stock in the
    public market could adversely affect the market price of the Common Stock
    and could impair the Company's future ability to raise capital through an
    offering of its equity securities. See "Risk Factors-Significant
    Additional Shares Eligible for Future Sale." 


    LEGAL OPINIONS

      The validity of the issuance of the Common Stock offered in the
    Offerings will be passed upon for the Company by Seth H. Hoogasian, Esq.,
    General Counsel of Thermo Electron, ThermoTrex and the Company.  Mr.
    Hoogasian owns or has the right to acquire 6,000 shares of Common Stock,
    7,800 shares of common stock of ThermoTrex and 115,927 shares of common
    stock of Thermo Electron. 

    EXPERTS

      The Consolidated Financial Statements of the Company included in this
    Prospectus and the financial statement schedule included in the
    Registration Statement of which this Prospectus forms a part have been
    audited by Arthur Andersen LLP, independent public accountants, to the
    extent and for the periods as indicated in their reports with respect
    thereto, and are included herein in reliance upon the authority of said
    firm as experts in accounting and auditing in giving said reports. 

    ADDITIONAL INFORMATION

      The Company has filed with the Securities and Exchange Commission (the
    "Commission") a Registration Statement (which term shall include all
    amendments, exhibits and schedules thereto) on Form S-1 under the
    Securities Act with respect to the shares of Common Stock offered hereby.
    This Prospectus, which constitutes a part of the Registration Statement,
    does not contain all of the information set forth in the Registration
    Statement, certain parts of which are omitted in accordance with the
    rules and regulations of the Commission, to which Registration Statement
    reference is hereby made. Although statements made in this Prospectus as

                                       50
PAGE
<PAGE>





    to the contents of any contract, agreement or other document referred to
    set forth all material elements of such documents, such statements are
    not necessarily complete. With respect to each such contract, agreement
    or other document filed as an exhibit to the Registration Statement,
    reference is made to the exhibit for a more complete description of the
    matter involved, and each such statement, although setting forth all
    material elements of such documents, shall be deemed qualified by such
    reference. The Registration Statement and the exhibits thereto may be
    inspected and copied at prescribed rates at the public reference
    facilities maintained by the Commission at Room 1024, Judiciary Plaza,
    450 Fifth Street, N.W., Washington, D.C. 20549 and at the regional
    offices of the Commission located at Seven World Trade Center, 13th
    Floor, New York, New York 10048 and 500 West Madison Street, Suite 1400,
    Chicago, Illinois 60661. In addition, the Commission maintains a Web site
    (http://www.sec.gov) that contains reports, proxy and information
    statements and other information regarding registrants








































                                       51
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<PAGE>





    INDEX TO FINANCIAL STATEMENTS

    Trex Medical Corporation

        Report of Independent Public Accountants                          F-2

        Consolidated Statement of Income for the years ended
         September 28, 1996 and September 30, 1995, the nine
         months ended September 30, 1995 and the year ended
         December 31, 1994                                                F-3

        Consolidated Balance Sheet as of September 28, 1996 and
         September 30, 1995                                               F-4

        Consolidated Statement of Cash Flows for the years ended
         September 28, 1996 and September 30, 1995, the nine
         months ended September 30, 1995 and the year ended
         December 31, 1994                                                F-5

        Consolidated Statement of Shareholders' Investment for
         the years ended September 28, 1996 and September 30, 
         1995, the nine months ended September 30, 1995 and 
         the year ended December 31, 1994                                 F-7

        Notes to Consolidated Financial Statements                        F-8































                                      F-23
PAGE
<PAGE>


        Report of Independent Public Accountants
        -----------------------------------------------------------------


    To the Shareholders and Board of Directors of Trex Medical Corporation:

         We have audited the accompanying consolidated balance sheet of Trex
    Medical Corporation (a Delaware corporation and 80%-owned subsidiary of
    ThermoTrex Corporation) and subsidiaries as of September 28, 1996 and
    September 30, 1995, and the related consolidated statements of income,
    shareholders' investment and cash flows for the year ended September 28,
    1996, the nine months ended September 30, 1995, and the year ended
    December 31, 1994. These consolidated financial statements are the
    responsibility of the Company's management. Our responsibility is to
    express an opinion on these consolidated financial statements based on
    our audits.

         We conducted our audits in accordance with generally accepted
    auditing standards. Those standards require that we plan and perform the
    audit to obtain reasonable assurance about whether the financial
    statements are free of material misstatement. An audit includes
    examining, on a test basis, evidence supporting the amounts and
    disclosures in the financial statements. An audit also includes assessing
    the accounting principles used and significant estimates made by
    management, as well as evaluating the overall financial statement
    presentation. We believe that our audits provide a reasonable basis for
    our opinion.

         In our opinion, the consolidated financial statements referred to
    above present fairly, in all material respects, the financial position of
    Trex Medical Corporation and subsidiaries as of September 28, 1996 and
    September 30, 1995, and the results of their operations and their cash
    flows for the year ended September 28, 1996, the nine months ended
    September 30, 1995, and the year ended December 31, 1994, in conformity
    with generally accepted accounting principles.



                                                   Arthur Andersen LLP



    Boston, Massachusetts
    November 1, 1996
















                                     F-1F-4
PAGE
<PAGE>


        Trex Medical Corporation
        Consolidated Statement of Income

                                                     Nine Months
                                   Year Ended           Ended     Year
                              ---------------------  -----------  ----------
                            Ended
    (In thousands except)     Sept. 28,   Sept. 30,    Sept. 30,    Dec. 31,
    per share amounts)             1996        1995         1995        1994
    ------------------------------------------------------------------------
                                         (Unaudited)

    Revenues (includes $8,910,
      $470, $470 and $0 to
      affiliated companies)
      (Notes 9 and 10)         $150,195    $ 70,505    $ 55,291    $ 54,410
                               --------    --------    --------    --------

    Costs and Operating
      Expenses:
      Cost of revenues 
      (includes $4,698, $223,
        $223 and $0 for 
        affiliated companies
        revenues) (Note 9)       86,642      36,320      28,180      27,794
      Selling, general and
        administrative
        expenses (Note 9)        27,156      15,652      12,174      13,272
      Research and development
        expenses (Note 9)        18,862      11,937       8,595      10,662
                               --------    --------    --------    --------

                                132,660      63,909      48,949      51,728
                               --------    --------    --------    --------

    Operating Income             17,535       6,596       6,342       2,682

    Interest Income               1,290           -           -           -
    Interest Expense, Related
      Party (Note 9)             (1,373)          -           -           -
    Other Income (Expense), Net      60          11          22         (22)
                               --------    --------    --------    --------

    Income Before Provision for
      Income Taxes               17,512       6,607       6,364       2,660
    Provision for Income Taxes
      (Note 7)                    8,168       3,015       2,881       1,466
                               --------    --------    --------    --------

    Net Income                 $  9,344    $  3,592    $  3,483    $  1,194
                               ========    ========    ========    ========

    Earnings per Share:
      Primary                  $    .40    $    .18    $    .17    $    .06
                               ========    ========    ========    ========
      Fully diluted            $    .38    $    .18    $    .17    $    .06
                               ========    ========    ========    ========

    Weighted Average Shares:
      Primary                    23,483      20,151      20,151      20,151
                               ========    ========    ========    ========
      Fully diluted              26,550      20,151      20,151      20,151
                               ========    ========    ========    ========
    The accompanying notes are an integral part of these consolidated
    financial statements.


                                       F-5
PAGE
<PAGE>


        Trex Medical Corporation
        Consolidated Balance Sheet

                                                September 28,  September 30,
    (In thousands except share amounts)                  1996           1995
    ------------------------------------------------------------------------

    Assets
    Current Assets:
      Cash and cash equivalents                      $ 33,966       $    202
      Accounts receivable, less allowances
        of $1,264 and $870                             29,104         14,937
      Inventories                                      33,010         16,667
      Prepaid expenses                                  1,316            113
      Prepaid income taxes (Note 7)                     5,712          3,474
                                                     --------       --------
                                                      103,108         35,393
                                                     --------       --------

    Property, Plant and Equipment, at Cost, Net        13,770          7,811
                                                     --------       --------
    Cost in Excess of Net Assets of Acquired
      Companies (Note 3)                               83,972         59,170
                                                     --------       --------

                                                     $200,850       $102,374
                                                     ========       ========

    Liabilities and Shareholders' Investment
    Current Liabilities:
      Accounts payable                               $ 12,598       $  7,381
      Accrued payroll and employee benefits             4,616          2,338
      Accrued warranty costs                            5,344          2,991
      Customer deposits                                 3,414            771
      Accrued income taxes                              2,010              -
      Other accrued expenses (Note 3)                  12,203          8,245
      Due to affiliated companies                       3,089            496
                                                     --------       --------
                                                       43,274         22,222
                                                     --------       --------

    Deferred Income Taxes (Note 7)                        170            142
                                                     --------       --------
    Long-term Obligations:
      4.2% Subordinated convertible note, due
        to parent company (Note 9)                      8,000              -
      Other                                               109              -
                                                     --------       --------
                                                        8,109              -
                                                     --------       --------

    Commitments and Contingencies
      (Notes 3, 8, 9 and 11)

    Shareholders' Investment (Notes 4 and 5):
      Common stock, $.01 par value, 50,000,000
        shares authorized; 28,592,630 shares
        issued and outstanding in 1996                    286              -
      Capital in excess of par value                  139,667              -
      Retained earnings                                 9,344              -
      Net parent company investment                         -         80,010
                                                     --------       --------
                                                      149,297         80,010
                                                     --------       --------

                                                     $200,850       $102,374
                                                     ========       ========
    The accompanying notes are an integral part of these consolidated
    financial statements.


                                       F-6
PAGE
<PAGE>


           Trex Medical Corporation
        Consolidated Statement of Cash Flows    

                                                                             
                                                    Nine Months
                                   Year Ended          Ended     Yea
                              --------------------- -----------  ----
                                                                      Ended
                                                                     ------
                              Sept. 28,   Sept. 30,   Sept. 30,    Dec. 31,
    (In thousands)                 1996        1995        1995        1994
    -----------------------------------------------------------------------
                                         (Unaudited)
    Operating Activities:
      Net income               $  9,344    $  3,592   $  3,483    $  1,194
      Adjustments to reconcile
        net income to net cash
        provided by operating
        activities:
          Depreciation and
            amortization          3,195       1,702      1,315       1,491
          Provision for losses
            on accounts
            receivable              273          75         25         175
          Increase (decrease)
            in deferred income
            taxes                   (26)         61         29          32
          Gain on sale of
            property, plant
            and equipment           (32)        (15)       (15)          -
          Changes in current
            accounts, exclud-
            ing the effects
            of acquisitions:
              Accounts
                receivable       (7,681)     (1,305)      (693)     (3,316)
              Inventories        (2,105)       (533)    (1,476)        153
              Other current
                assets           (1,835)         (6)       (82)        125
              Accounts payable      106       2,342        621       1,861
              Other current
                liabilities       4,711      (1,139)       444         411
                               --------    --------   --------    --------

      Net cash provided by
        operating activities      5,950       4,774      3,651       2,126
                               --------    --------   --------    --------

    Investing Activities:
      Acquisitions, net of cash
        acquired (Note 3)       (36,888)          -          -           -
      Purchases of property,
        plant and equipment      (3,071)     (1,533)      (957)     (1,300)
      Other, net                     16          14         14          29
                               --------    --------   --------    --------

      Net cash used in
        investing activities   $(39,943)   $ (1,519)  $   (943)   $ (1,271)
                               --------    --------   --------    --------








                                       F-7
PAGE
<PAGE>


           Trex Medical Corporation
        Consolidated Statement of Cash Flows (continued)    


                                                     Nine Months
                                   Year Ended           Ended     Year
                             ----------------------  -----------  ----
                                                                       Ended
                                                      ------
                             Sept. 28,    Sept. 30,    Sept. 30,    Dec. 31,
    (In thousands)                1996         1995         1995        1994
    ------------------------------------------------------------------------
                                         (Unaudited)
    Financing Activities:
      Net proceeds from
        issuance of Company
        common stock (Note 4) $ 67,757     $      -    $      -     $      -
      Net transfers to parent
        company                      -       (3,053)     (2,506)        (855)
                              --------     --------    --------     --------

      Net cash provided by
        (used in) financing
        activities              67,757       (3,053)     (2,506)        (855)
                              --------     --------    --------     --------

    Increase in Cash and
      Cash Equivalents          33,764          202         202            -
    Cash and Cash Equivalents
      at Beginning of Period       202            -           -            -
                              --------     --------    --------     --------

    Cash and Cash Equivalents
      at End of Period        $ 33,966     $    202    $    202     $      -
                              ========     ========    ========     ========

    Cash Paid For:
      Interest                $  1,373     $      -    $      -     $      -
      Income taxes            $  1,294     $      -    $      -     $      -

    Noncash Activities:
      Fair value of assets of
        acquired companies    $ 53,519     $      -    $      -     $      -
      Cash paid for acquired
        companies              (38,178)           -           -            -
                              --------     --------    --------     --------
          Liabilities assumed
           of acquired
           companies          $ 15,341     $      -    $      -     $      -
                              ========     ========    ========     ========
      Transfer of acquired
        business from
        parent company, net
        of cash               $      -     $ 42,000    $ 42,000     $      -
      Issuance of subordinated
        convertible note to
        parent company        $ 42,000     $      -    $      -     $      -
      Conversions of subord-
        inated convertible
        note by parent
        company               $ 34,000     $      -    $      -     $      -


    The accompanying notes are an integral part of these consolidated
    financial statements.


                                       F-8
PAGE
<PAGE>


           Trex Medical Corporation
        Consolidated Statement of Shareholders' Investment    



                                    Common    Capital
                                    Stock,  in Excess             Net Parent
                                  $.01 Par     of Par    Retained    Company
    (In thousands)                   Value      Value    Earnings Investment
    ------------------------------------------------------------------------

    Balance January 1, 1994      $      -   $      -    $      -    $ 36,694
    Net income                          -          -           -       1,194
    Net transfers to parent
      company                           -          -           -        (855)
                                 --------   --------    --------    --------

    Balance December 31, 1994           -          -           -      37,033
    Net income                          -          -           -       3,483
    Net transfers to parent
      company                           -          -           -      (2,506)
    Transfer of acquired
      business from parent
      company, net of cash
      (Note 3)                          -          -           -      42,000
                                 --------   --------    --------    --------

    Balance September 30, 1995          -          -           -      80,010
    Issuance of subordinated
      convertible note to parent
      company (Note 9)                  -    (42,000)          -           -
    Capitalization of Company         200     79,810           -     (80,010)
    Net income                          -          -       9,344           -
    Net proceeds from issuance
      of Company common stock
      (Note 4)                         57     67,700           -           -
    Tax benefit related to
      employees' and directors'
      stock plans                       -        186           -           -
    Conversions of subordinated
      convertible note by parent
      company (Note 4)                 29     33,971           -           -
                                 --------   --------    --------    --------

    Balance September 28, 1996   $    286   $139,667    $  9,344    $      -
                                 ========   ========    ========    ========


    The accompanying notes are an integral part of these consolidated
    financial statements.
                                          












                                       F-9
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    1.   Nature of Operations and Summary of Significant Accounting Policies

    Nature of Operations

         Trex Medical Corporation (the Company) designs, manufactures, and
    markets mammography equipment and minimally invasive stereotactic breast-
    biopsy systems used for the detection of breast cancer. The Company also
    designs and manufactures general radiography (X-ray) equipment and X-ray
    imaging systems used for cardiac catheterization and angiography, as well
    as radiographic fluoroscopy. The Company's mammography and stereotactic
    breast-biopsy systems are used by radiologists and physicians in offices,
    hospitals, and dedicated breast-care centers, and its general X-ray
    systems are used by physicians and radiologists, both in office and
    hospital settings, as well as by veterinarians and chiropractors.

    Relationship with ThermoTrex Corporation and Thermo Electron Corporation

         The Company was incorporated in September 1995 as a wholly owned
    subsidiary of ThermoTrex Corporation (ThermoTrex). On October 2, 1995,
    ThermoTrex transferred to the Company all of the outstanding shares of
    capital stock of Bennett X-Ray Corporation (Bennett), in exchange for a
    $42.0 million principal amount 4.2% subordinated convertible note
    (Note 9). As of September 28, 1996, ThermoTrex had converted $34.0
    million principal amount of this note. On October 16, 1995, ThermoTrex
    transferred to the Company the assets, liabilities, and businesses of
    ThermoTrex's Lorad division (Lorad) and ThermoTrex's research and
    development activities pertaining to its Sonic CT(TM) system, in exchange
    for 20,000,000 shares of the Company's common stock. ThermoTrex acquired
    Lorad and Bennett in November 1992 and September 1995, respectively.

         As of September 28, 1996, ThermoTrex owned 22,883,798 shares of the
    Company's common stock, representing 80% of such stock outstanding.
    ThermoTrex is a 51%-owned subsidiary of Thermo Electron Corporation
    (Thermo Electron).

    Principles of Consolidation

         The accompanying financial statements include the accounts of the
    Company and its wholly owned subsidiaries. All material intercompany
    accounts and transactions have been eliminated.

    Fiscal Year

         In September 1995, the Company changed its fiscal year end from the
    Saturday nearest December 31 to the Saturday nearest September 30.
    Accordingly, the Company's transition period, which ended on September
    30, 1995, was the 39-week period from January 1, 1995 to September 30,
    1995, referenced as "fiscal 1995." References to "fiscal 1996" and "1994"
    are for the years ended September 28, 1996 and December 31, 1994,
    respectively. Fiscal 1996 and 1994 each included 52 weeks. The unaudited
    consolidated statements of income and cash flows for the 52-week period
    ended September 30, 1995 are presented for comparative purposes only.




                                      F-10
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    1.   Nature of Operations and Summary of Significant Accounting Policies
         (continued)

    Revenue Recognition

         The Company recognizes revenues upon shipment of its products. The
    Company provides a reserve for its estimate of warranty costs at the time
    of shipment.

    Concentration of Credit Risk

         The Company sells its products primarily to customers in the
    healthcare industry. The Company does not normally require collateral or
    other security to support its accounts receivable. Management does not
    believe that this concentration of credit risk has, or will have, a
    significant negative impact on the Company.

    Income Taxes

         The Company and ThermoTrex have a tax allocation agreement under
    which the Company is included in the consolidated income tax returns
    filed by ThermoTrex. The agreement provides that in years in which the
    Company has taxable income, it will pay to ThermoTrex amounts comparable
    to the taxes the Company would have paid upon filing separate tax
    returns. If ThermoTrex's equity ownership of the Company were to decrease
    below 80%, the Company would file its own income tax returns.

         In accordance with Statement of Financial Accounting Standards
    (SFAS) No. 109, "Accounting for Income Taxes," the Company recognizes
    deferred income taxes based on the expected future tax consequences of
    differences between the financial statement basis and the tax basis of
    assets and liabilities, calculated using enacted tax rates in effect for
    the year in which the differences are expected to be reflected in the tax
    return.

    Earnings per Share

         Earnings per share have been computed based on the weighted average
    number of shares outstanding during the period. Pursuant to Securities
    and Exchange Commission requirements, earnings per share have been
    presented for all periods. Weighted average shares for all periods
    include the 20,000,000 shares issued to ThermoTrex in connection with the
    initial capitalization of the Company and, for periods prior to the
    Company's initial public offering, the effect of the assumed exercise of
    stock options issued within one year prior to the Company's initial
    public offering. Because the effect of common stock equivalents would be
    immaterial, they have been excluded from the primary earnings per share
    calculation subsequent to the Company's initial public offering. Fully
    diluted earnings per share include the assumed exercise of stock options
    and the assumed effect of the conversion of the Company's 4.2%
    subordinated convertible note, due to parent company.





                                      F-11
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    1.   Nature of Operations and Summary of Significant Accounting Policies
         (continued)

    Cash and Cash Equivalents

         As of September 28, 1996, $32,696,000 of the Company's cash
    equivalents were invested in a repurchase agreement with Thermo Electron.
    Under this agreement, the Company in effect lends excess cash to Thermo
    Electron, which Thermo Electron collateralizes with investments
    principally consisting of corporate notes, U.S. government agency
    securities, money market funds, commercial paper, and other marketable
    securities, in the amount of at least 103% of such obligation. The
    Company's funds subject to the repurchase agreement are readily
    convertible into cash by the Company. The repurchase agreement earns a
    rate based on the 90-day Commercial Paper Composite Rate plus 25 basis
    points, set at the beginning of each quarter. 

         Prior to its incorporation in September 1995, the Company's cash
    receipts and disbursements were combined with other ThermoTrex corporate
    cash transactions and balances.

    Inventories

         Inventories are stated at the lower of cost (on a first-in,
    first-out basis) or market value and include materials, labor, and
    manufacturing overhead. The components of inventories are as follows:

    (In thousands)                                         1996       1995
    ----------------------------------------------------------------------

    Raw materials and supplies                          $20,513    $ 9,414
    Work in process                                       9,218      5,195
    Finished goods                                        3,279      2,058
                                                        -------    -------

                                                        $33,010    $16,667
                                                        =======    =======





















                                      F-12
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    1.   Nature of Operations and Summary of Significant Accounting Policies
         (continued)

    Property, Plant and Equipment

         The costs of additions and improvements are capitalized, while
    maintenance and repairs are charged to expense as incurred. The Company
    provides for depreciation and amortization principally using the
    straight-line method over the estimated useful lives of the property as
    follows: buildings, 29 to 31.5 years; machinery and equipment, 3 to 8
    years; and leasehold improvements, the shorter of the term of the lease
    or the life of the asset. Property, plant and equipment consist of the
    following: 

    (In thousands)                                         1996       1995
    ----------------------------------------------------------------------

    Land                                                $ 1,194     $1,000
    Buildings                                             3,788      2,728
    Leasehold improvements                                2,195      1,293
    Machinery and equipment                              10,082      4,918
                                                        -------     ------

                                                         17,259      9,939
    Less: Accumulated depreciation and amortization       3,489      2,128
                                                        -------     ------

                                                        $13,770     $7,811
                                                        =======     ======

    Cost in Excess of Net Assets of Acquired Companies

         The excess of cost over the fair value of net assets of acquired
    companies is amortized using the straight-line method over 40 years.
    Accumulated amortization was $3,621,000 and $1,935,000 as of September
    28, 1996 and September 30, 1995, respectively. The Company assesses the
    future useful life of this asset whenever events or changes in
    circumstances indicate that the current useful life has diminished. The
    Company considers the future undiscounted cash flows of the acquired
    businesses in assessing the recoverability of this asset.

    Use of Estimates

         The preparation of financial statements in conformity with generally
    accepted accounting principles requires management to make estimates and
    assumptions that affect the reported amounts of assets and liabilities,
    disclosure of contingent assets and liabilities at the date of the
    financial statements, and the reported amounts of revenues and expenses
    during the reporting period. Actual results could differ from those
    estimates.









                                      F-13
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    2.   Unaudited Comparative Results

         The following unaudited financial information for the nine months
    ended October 1, 1994 is presented to provide comparative results for
    fiscal 1995, included in the accompanying statement of income.

                                                                   Nine
                                                               Months Ended
                                                                October 1,
    (In thousands except per share amounts)                        1994    

    Revenues                                                     $39,196

    Costs and Operating Expenses:
      Cost of revenues                                            19,654
      Selling, general and administrative
        expenses                                                   9,794
      Research and development expenses                            7,320
                                                                 -------

                                                                  36,768
                                                                 -------

    Operating Income                                               2,428

    Other Expense, Net                                               (11)
                                                                 -------

    Income Before Provision for Income Taxes                       2,417

    Provision for Income Taxes                                     1,332
                                                                 -------

    Net Income                                                   $ 1,085
                                                                 =======

    Earnings per Share:
      Primary                                                    $   .05
                                                                 =======
      Fully diluted                                              $   .05
                                                                 =======

    Weighted Average Shares:
      Primary                                                     20,151
                                                                 =======
      Fully diluted                                               20,151
                                                                 =======


    3.   Acquisitions

         In September 1996, the Company acquired substantially all of the
    assets and liabilities of Continental X-Ray Corporation and affiliates
    (Continental), an Illinois-based company that designs, manufactures, and
    markets general-purpose and specialized X-ray systems, for approximately
    $18.4 million in cash, net of cash acquired and including the repayment
    of debt.



                                      F-14
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    3.   Acquisitions (continued)

         In May 1996, the Company acquired substantially all of the assets
    and liabilities of XRE Corporation (XRE), a Massachusetts-based company
    that designs, manufactures, and markets X-ray imaging systems used in the
    diagnosis and treatment of coronary artery disease and other vascular
    conditions, for approximately $18.5 million in cash, net of cash acquired
    and including the repayment of debt.

         In September 1995, ThermoTrex acquired all of the outstanding
    capital stock of Bennett, a New York-based manufacturer of high-frequency
    specialty and general-purpose X-ray systems, for approximately $42.9
    million in cash. On October 2, 1995, ThermoTrex transferred to the
    Company all of the outstanding capital stock of Bennett, in exchange for
    a $42.0 million principal amount 4.2% subordinated convertible note
    (Note 9). 

         These acquisitions have been accounted for using the purchase
    method of accounting, and their results of operations have been included
    in the accompanying financial statements from their respective dates of
    acquisition by the Company, or for Bennett, by ThermoTrex. The cost of
    the acquisitions exceeded the estimated fair value of the acquired net
    assets by $64.0 million, which is being amortized over 40 years.
    Allocation of the purchase price for these acquisitions was based on
    estimates of the fair value of the net assets acquired and, for XRE and
    Continental, is subject to adjustment upon finalization of the purchase
    price allocation. To date, no information has been gathered that would
    cause the Company to believe that the final allocation of the purchase
    price will be materially different from the preliminary estimate.

         Based on unaudited data, the following table presents selected
    financial information for the Company and the businesses acquired on a
    pro forma basis, assuming Continental and XRE had been combined since the
    beginning of 1995 and Bennett had been combined since the beginning of
    1994. 

                                                     Nine
                                  Year Ended     Months Ended    Year Ended
    (In thousands except         September 28,   September 30,  December 31,
    per share amounts)                1996            1995          1994
    ------------------------------------------------------------------------

    Revenues                        $191,351        $126,185        $96,943
    Net income (loss)                  9,300           2,012         (1,258)
    Earnings (loss) per share:
      Primary                            .29             .07           (.06)
      Fully diluted                      .29             .07           (.06)

         The pro forma results are not necessarily indicative of future
    operations or the actual results that would have occurred had the
    acquisitions of XRE and Continental been made at the beginning of fiscal
    1995 and the acquisition of Bennett been made at the beginning of 1994.

         In November 1992, ThermoTrex acquired Lorad for $5.3 million in
    cash, assumption of $6.7 million of pre-existing debt of Lorad, and
    shares of ThermoTrex common stock and stock options valued at $12.3

                                      F-15
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    3.   Acquisitions (continued)

    million. In addition, in March 1995, ThermoTrex made a cash payment of
    $2.3 million to the holders of approximately 9.2% of Lorad's common stock
    who had earlier voted against the acquisition, in exchange for their
    interest in Lorad.

         Other accrued expenses in the accompanying balance sheet include
    $3.5 million and $4.0 million as of September 28, 1996 and September 30,
    1995, respectively, for estimated reserves associated with acquisitions,
    including a reserve of approximately $2 million for legal fees and other
    costs associated with a patent infringement suit that existed prior to
    ThermoTrex's acquisition of Lorad. This suit was brought by Fischer
    Imaging Corporation (Fischer), which alleges that Lorad infringes a
    Fischer patent on a precision mammographic needle-biopsy system. In
    connection with the organization of the Company, ThermoTrex agreed to
    indemnify the Company for any and all cash damages under this lawsuit,
    with respect to sales occurring prior to October 16, 1995, the date Lorad
    was transferred to the Company. Any payments received under such
    indemnity would be treated as a contribution to shareholders' investment.
    While the Company believes that it has meritorious legal defenses to the
    allegation, due to the inherent uncertainties of litigation, the Company
    is unable to predict the outcome of this matter. Although an unsuccessful
    resolution could have a material adverse effect on the Company's results
    of operations, in the opinion of management any resolution will not have
    a material adverse effect on the Company's financial position.


    4.   Common Stock

    Sale of Common Stock

         In July 1996, the Company sold 2,875,000 shares of its common stock
    in an initial public offering and 871,832 shares of its common stock in a
    concurrent rights offering, at $14.00 per share, for net proceeds of
    $49.1 million.

         In November 1995, the Company issued 1,862,000 shares of its common
    stock in a private placement at $10.25 per share for net proceeds of
    $17.6 million. In January 1996, the Company issued 100,000 shares of its
    common stock in a private placement at $10.75 per share for net proceeds
    of $1.1 million. Certain officers and directors of the Company purchased
    an aggregate of 143,300 shares of the Company's common stock issued in
    these private placements. In addition, an entity indirectly related to a
    director of the Company purchased 200,000 shares of the Company's common
    stock issued in these private placements. This director, however,
    disclaims beneficial ownership of such shares.

    Conversion of Subordinated Convertible Note

         During fiscal 1996, ThermoTrex converted $34.0 million principal
    amount of the Company's 4.2% subordinated convertible note into 2,883,798
    shares of the Company's common stock.



                                      F-16
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    4.   Common Stock (continued)

    Reserved Shares

         As of September 28, 1996, the Company had reserved 2,603,542
    unissued shares of its common stock for possible issuance under
    stock-based compensation plans and conversion of the Company's 4.2%
    subordinated convertible note, due to parent company.

    5.   Stock-based Compensation Plans

         On November 1, 1995, the Company adopted a stock-based compensation
    plan for its key employees, directors, and others, which permits the
    grant of a variety of stock and stock-based awards as determined by the
    human resources committee of the Company's Board of Directors (the Board
    Committee), including restricted stock, stock options, stock bonus shares
    or performance-based shares. The option recipients and the terms of
    options granted under this plan are determined by the Board Committee.
    Options granted to date became exercisable on September 30, 1996, and are
    subject to certain transfer restrictions and the right of the Company to
    repurchase shares issued upon exercise of the options at the exercise
    price, upon certain events. The restrictions and repurchase rights
    generally lapse ratably over periods ranging from five to ten years after
    the first anniversary of the grant date, depending on the term of the
    option, which may range from ten to twelve years. Nonqualified stock
    options may be granted at any price determined by the Board Committee,
    although incentive stock options must be granted at not less than the
    fair market value of the Company's common stock on the date of grant. To
    date, all options have been granted at fair market value. The Company
    also has a directors' stock option plan, adopted on November 1, 1995,
    that provides for the grant of stock options, at fair market value, to
    outside directors pursuant to a formula approved by the Company's
    shareholders. Options granted under this plan have the same general terms
    as options granted under the stock-based compensation plan described
    above, except that the restrictions and repurchase rights generally lapse
    ratably over a four-year period and the option term is five years. In
    addition to the Company's stock-based compensation plans, certain
    officers and key employees may also participate in the stock-based
    compensation plans of Thermo Electron or its majority-owned subsidiaries.

















                                      F-17
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    5.   Stock-based Compensation Plans (continued)

         No accounting recognition is given to options granted at fair
    market value until they are exercised. Upon exercise, net proceeds,
    including tax benefits realized, are credited to equity. A summary of the
    Company's stock option information for fiscal 1996 is as follows:

                                                                  Range of
                                                                    Option
                                                     Number         Prices
                                                         of            per
    (In thousands except per share amounts)          Shares          Share
    ----------------------------------------------------------------------
    Options outstanding, beginning of year                -   $          -

      Granted                                         1,401    10.25-12.00

      Exercised                                           -              -

      Lapsed or cancelled                               (20)         11.00
                                                      -----    -----------

    Options outstanding, end of year                  1,381   $10.25-12.00
                                                      =====

    Options exercisable                                   -
                                                      =====

    Options available for grant                         519
                                                      =====

    6.   Employee Benefit Plans

    Employee Stock Purchase Plan

         Substantially all of the Company's full-time employees are eligible
    to participate in an employee stock purchase plan sponsored by
    ThermoTrex. Under this plan, shares of ThermoTrex's and Thermo Electron's
    common stock can be purchased at the end of a 12-month plan year at 95%
    of the fair market value at the beginning of the plan year, and the
    shares purchased are subject to a six-month resale restriction. Prior to
    November 1, 1995, the applicable shares of common stock could be
    purchased at 85% of the fair market value at the beginning of the plan
    year, and the shares purchased were subject to a one-year resale
    restriction. Shares are purchased through payroll deductions of up to 10%
    of each participating employee's gross wages.

    401(k) Savings Plan

         The majority of the Company's full-time employees are eligible to
    participate in Thermo Electron's 401(k) savings plan. Contributions to
    the 401(k) savings plan are made by both the employee and the Company.
    Company contributions are based upon the level of employee contributions.
    The Company contributed and charged to expense for these plans $701,000,
    $242,000, and $313,000, in fiscal 1996, fiscal 1995, and 1994,
    respectively.


                                      F-18
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    7.   Income Taxes

         The components of the provision for income taxes for fiscal 1996,
    fiscal 1995, and 1994 are as follows:

    (In thousands)                                 1996      1995      1994
    -----------------------------------------------------------------------

    Currently payable:
      Federal                                    $6,324    $2,474    $1,119
      State                                       1,866       808       547
                                                 ------    ------    ------

                                                  8,190     3,282     1,666
                                                 ------    ------    ------

    Prepaid:
      Federal                                       (16)     (228)     (146)
      State                                          (6)     (173)      (54)
                                                 ------    ------    ------

                                                    (22)     (401)     (200)
                                                 ------    ------    ------

                                                 $8,168    $2,881    $1,466
                                                 ======    ======    ======

         The Company receives a tax deduction upon exercise of nonqualified
    stock options by employees for the difference between the exercise price
    and the market price of the Company's common stock on the date of
    exercise. The provision for income taxes that is currently payable does
    not reflect $186,000 of such benefits that have been allocated to capital
    in excess of par value for fiscal 1996 resulting from employee exercises
    of stock options in affiliated companies.

         The provision for income taxes in the accompanying statement of
    income for fiscal 1996, fiscal 1995, and 1994 differs from the provision
    calculated by applying the statutory federal income tax rate of 35% in
    fiscal 1996 and 34% in fiscal 1995 and 1994 to income before provision
    for income taxes due to the following:

    (In thousands)                                 1996      1995      1994
    -----------------------------------------------------------------------

    Provision for income taxes
      at statutory rate                          $6,129    $2,164    $  904
    Increases resulting from:
      State income taxes, net of federal tax      1,209       419       325
      Amortization of cost in excess of net
        assets of acquired companies                541       197       228
      Other, net                                    289       101         9
                                                 ------    ------    ------

                                                 $8,168    $2,881    $1,466
                                                 ======    ======    ======








                                      F-19
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    7.   Income Taxes (continued)

         Prepaid income taxes and deferred income taxes in the accompanying
    balance sheet consist of the following:

    (In thousands)                                            1996      1995
    ------------------------------------------------------------------------

    Prepaid income taxes:
      Reserves and accruals                                 $3,409    $1,725
      Accrued compensation                                   1,107       463
      Allowance for doubtful accounts                          430       348
      Inventory basis difference                               766       918
      Other, net                                                 -        20
                                                            ------    ------

                                                            $5,712    $3,474
                                                            ======    ======
    Deferred income taxes:
      Depreciation                                          $  170    $  142
                                                            ======    ======


    8.   Commitments

         The Company leases portions of its office and operating facilities
    under various noncancelable operating lease arrangements expiring between
    fiscal 1997 and fiscal 2006. The accompanying statement of income
    includes expenses from these operating leases of $674,000, $44,000, and
    $40,000 in fiscal 1996, fiscal 1995, and 1994, respectively. Future
    minimum payments due under these noncancelable operating leases at
    September 28, 1996, are $1,443,000 in fiscal 1997; $1,406,000 in fiscal
    1998; $1,377,000 in fiscal 1999; $1,372,000 in fiscal 2000; $1,372,000 in
    fiscal 2001; and $6,409,000 in fiscal 2002 and thereafter. Total future
    minimum lease payments are $13,379,000. The Company also has an operating
    lease arrangement with a related party as discussed in Note 9.


    9.   Related Party Transactions

    Corporate Services Agreement

         The Company and Thermo Electron have a corporate services agreement
    under which Thermo Electron's corporate staff provides certain
    administrative services, including certain legal advice and services,
    risk management, certain employee benefit administration, tax advice and
    preparation of tax returns, centralized cash management, and certain
    financial and other services, for which the Company pays Thermo Electron
    annually an amount equal to 1.0% of the Company's revenues. The Company
    paid an annual fee equal to 1.20% and 1.25% of the Company's revenues in
    calendar year 1995 and 1994, respectively. The annual fee is reviewed and
    adjusted annually by mutual agreement of the parties. For these services,
    the Company was charged $1,567,000, $663,000, and $680,000 in fiscal
    1996, fiscal 1995, and 1994, respectively. Management believes that the
    service fee charged by Thermo Electron is reasonable and that such fees
    are representative of the expenses the Company would have incurred on a
    stand-alone basis. The corporate services agreement is renewed annually

                                      F-20
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    9.   Related Party Transactions (continued)

    but can be terminated upon 30 days' prior notice by the Company or upon
    the Company's withdrawal from the Thermo Electron Corporate Charter (the
    Thermo Electron Corporate Charter defines the relationship among Thermo
    Electron and its majority-owned subsidiaries). For additional items such
    as employee benefit plans, insurance coverage, and other identifiable
    costs, Thermo Electron charges the Company based upon costs attributable
    to the Company.

    Related Party Revenues

         ThermoLase Corporation (ThermoLase), a majority-owned subsidiary of
    ThermoTrex, has engaged the Company to design and manufacture the laser
    to be used in ThermoLase's laser-based hair-removal system. During fiscal
    1996 and fiscal 1995, the Company recorded $8,549,000 and $350,000,
    respectively, of revenue under this agreement.

         Under an arrangement with Thermedics Detection Inc., a
    majority-owned subsidiary of Thermedics Inc., a majority-owned subsidiary
    of Thermo Electron, the Company manufactures an X-ray source, pursuant to
    written purchase orders, that is used as a component to a fill-measuring
    device produced by Thermedics Detection Inc. During fiscal 1996 and
    fiscal 1995, the Company recorded $361,000 and $120,000, respectively, of
    revenue under this agreement.

    Vendor Agreement

         During fiscal 1995, the Company placed an order for $2,500,000 for
    the design and production of high-transmission cellular grids from Thermo
    Electron's Tecomet division (Tecomet), which will be received through
    fiscal 1997. During fiscal 1996, the Company purchased grids valued at
    $397,000 from Tecomet under this arrangement. In addition, the Company
    recorded expense of $250,000 during each of fiscal 1996 and fiscal 1995
    related to research and development funding provided to Tecomet in
    connection with this project.

    Research and Development Agreement

         In October 1995, the Company and ThermoTrex entered into a license
    agreement under which the Company may elect to fund approximately $6.0
    million of ThermoTrex's research and development efforts related to
    direct-detection digital imaging technology in certain medical imaging
    fields.  If the Company elects to fund such costs, it is required to pay
    approximately $2.0 million in each of three years through fiscal 1998 and
    its license will be extended to cover such fields.  In fiscal 1996, the
    Company recorded $1,800,000 of expense under this agreement.  Prior to
    this agreement, ThermoTrex provided certain research and development
    contract services to the Company, which were charged to the Company based
    on actual cost and usage. For these services, the Company was charged
    $1,536,000, and $2,816,000 in fiscal 1995 and 1994, respectively.





                                      F-21
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    9.   Related Party Transactions (continued)

    Operating Lease

         The Company leases an office and operating facility from a realty
    trust controlled by an employee under a noncancelable operating lease
    arrangement expiring in fiscal 2012. The accompanying statement of income
    includes expenses from this operating lease of $286,000 in fiscal 1996.
    Future minimum payments due under this noncancelable operating lease at
    September 28, 1996, are $858,000 per year in fiscal 1997, 1998, 1999, and
    2000; $897,000 in fiscal 2001; and $11,102,000 in fiscal 2002 and
    thereafter. Total future minimum lease payments are $15,431,000.

    Repurchase Agreement

         The Company invests excess cash in a repurchase agreement with
    Thermo Electron as discussed in Note 1.

    Subordinated Convertible Note

         In September 1995, ThermoTrex acquired all of the outstanding
    capital stock of Bennett for approximately $42.9 million in cash. On
    October 2, 1995, ThermoTrex transferred to the Company all of the
    outstanding capital stock of Bennett, in exchange for a $42.0 million
    principal amount 4.2% subordinated convertible note, due 2000,
    convertible into shares of the Company's common stock at $11.79 per
    share. As of September 28, 1996, ThermoTrex had converted $34.0 million
    principal amount of this note.


    10.  Significant Customers and Export Sales

         Sales to one customer accounted for 11% of the Company's total
    revenues in fiscal 1996, and sales to another customer accounted for 18%
    and 11% of the Company's total revenues in fiscal 1995 and 1994,
    respectively. Export sales to Germany accounted for 7%, 11%, and 3% of
    the Company's total revenues in fiscal 1996, fiscal 1995, and 1994,
    respectively. Other export sales accounted for 15%, 10%, and 11% of the
    Company's total revenues in fiscal 1996, fiscal 1995, and 1994,
    respectively. In general, export sales are denominated in U.S. dollars.


    11.  Contingencies

         The owner of a U.S. patent related to automatic exposure control
    has claimed that the Company's mammography systems infringe such patent.
    The patent owner has offered a nonexclusive license under the patent on
    terms not acceptable to the Company. Although the Company believes that
    the validity of the patent may be questionable and subject to a
    successful challenge, if the patent holder were successful in enforcing
    such patent the Company could be enjoined from manufacturing and selling
    mammography systems. The Company will be indemnified by ThermoTrex for
    any cash damages relating to sales of such systems occurring prior to the
    dates on which ThermoTrex transferred certain businesses to the Company,
    although any payments under such indemnity would be treated as a

                                      F-22
PAGE
<PAGE>


        Trex Medical Corporation
        Notes to Consolidated Financial Statements

    11.  Contingencies (continued)

    contribution to shareholders' investment. In addition, the Company is
    aware of two U.S. patents owned by a former employee which have been
    asserted against the Company relating to its High-Transmission Cellular
    (HTC)(TM) grid to be used with the Company's mammography systems.
    Although the Company believes that the HTC grid does not infringe either
    of these patents, if the holder of the patents were successful in
    enforcing such patents, the Company could be subject to damages and
    enjoined from manufacturing and selling the HTC grid. 

         See Note 3 for a discussion of certain additional litigation.

         Due to the inherent uncertainty of dispute resolution, management
    cannot predict the outcome of these matters. While an unfavorable outcome
    of one or more of these matters could have a material adverse effect on
    the Company's results of operations, in the opinion of management any
    resolution will not have a material effect on the Company's financial
    position.


    12.  Fair Value of Financial Instruments

         The Company's financial instruments consist primarily of cash and
    cash equivalents, accounts receivable, accounts payable, due to
    affiliated companies, and its 4.2% subordinated convertible note due to
    parent company. The carrying amounts of the Company's cash and cash
    equivalents, accounts receivable, accounts payable, and due to affiliated
    companies approximate fair value due to their short-term nature. The fair
    value of the Company's 4.2% subordinated convertible note (Note 9),
    determined based on quoted market prices, was $13,740,000 at September
    28, 1996, and exceeds the carrying amount due to the market price of the
    Company's common stock exceeding the conversion price of the convertible
    note at year end.






















                                      F-23
PAGE
<PAGE>









        No dealer, salesman or any other person has been authorized to give
    any information or to make any representation not contained in this
    Prospectus and, if given or made, such information or representations
    must not be relied upon as having been authorized by the Company.  This
    Prospectus does not constitute an offer to sell any securities other than
    those to which it relates or an offer to sell, or a solicitation of an
    offer to buy, to any person in any jurisdiction where such an offer or
    solicitation would be unlawful.  Neither the delivery of this Prospectus
    nor any sale made hereunder shall, under any circumstances, create any
    implication that the information contained herein is correct as of any
    date subsequent to the date hereof.





                                  300,000 shares

                                       TREX
                               Medical Corporation

                                   Common Stock












                              _____________________

                                          
                                 January __, 1997
                                           

                                    PROSPECTUS

                              ---------------------
PAGE
<PAGE>





                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

    Item 13.  Other Expenses of Issuance and Distribution

         The following table sets forth the various expenses in connection
    with the sale and distribution of the securities being registered, other
    than the underwriting discounts and commissions.  All amounts shown are
    estimates except for the Securities and Exchange Commission (the
    "Commission") registration fee.

          Securities and Exchange Commission registration     $1,323.87
         fee  ...............................................

          Legal fees and expenses  .......................... 10,000.00
          Accounting fees and expenses  ..................... 10,000.00
          Miscellaneous  ....................................  8,676.13
                                                               --------

                  Total  .................................... $30,000.0
                                                                      0

    Item 14.  Indemnification of Directors and Officers

         The Delaware General Corporation Law and the Company's Certificate
    of Incorporation and By-Laws limit the monetary liability of directors to
    the Company and to its shareholders and provide for indemnification of
    the Company's officers and directors for liabilities and expenses that
    they may incur in such capacities.  In general, officers and directors
    are indemnified with respect to actions taken in good faith in a manner
    reasonably believed to be in, or not opposed to the best interests of the
    Company and, with respect to any criminal action or proceeding, actions
    that the indemnitee had not reasonable cause to believe were unlawful.
    The Company also has indemnification agreements with its directors and
    officers that provide for the maximum indemnification allowed by law.
    Reference is made to the Company's Certificate of Incorporation, By-Laws
    and form of Indemnification Agreement for Officers and Directors
    incorporated by reference as Exhibits 3.1, 3.2 and 10.18 hereto,
    respectively.

         Thermo Electron has an insurance policy which insures the directors
    and officers of Thermo Electron and its subsidiaries, including the
    Company, against certain liabilities which might be incurred in
    connection with the performance of their duties.

         The Selling Shareholders are obligated under the Purchase Agreements
    to indemnify directors, officers and controlling persons of the Company
    against certain liabilities, including liabilities under the Securities
    Act.







                                      II-3
PAGE
<PAGE>





    Item 15.  Recent Sales of Unregistered Securities.

         On October 2, 1995, ThermoTrex transferred to the Company all
    outstanding capital stock of its Bennett X-Ray Corporation subsidiary in
    exchange for a $42,000,000 principal amount subordinated convertible note
    due 2000.  Exemption from registration for this transaction is claimed
    under Section 4(2) of the Securities Act.

         On October 16, 1995, ThermoTrex contributed all of the assets and
    liabilities relating to its Lorad division and it Sonic CT system to the
    Company in exchange for 20,000,000 shares of Common Stock.  Exemption for
    registration for this transaction is claimed under Section 4(2) of the
    Securities Act.

         On November 22, 1995 and November 30, 1995 the Company sold an
    aggregate of 1,862,000 shares of Common Stock to a group of accredited
    investors pursuant to Regulation D of the Commission promulgated under
    the Securities Act.

         On January 31, 1996, the Company sold 100,000 shares of Common Stock
    to an accredited investor pursuant to Regulation D of the Commission
    promulgated under the Securities Act.

         On December 19, 1996, the Company sold an aggregate of 300,000
    shares of Common Stock to a group of accredited investors pursuant to
    Regulation D of the Commission promulgated under the Securities Act.

    Item 16.  Exhibits and Financial Statements Schedule.

         (a)  See the Exhibit Index included immediately preceding the
    exhibits to this Registration Statement.

         (b)  The Financial Statement Schedule as of September 28, 1996 and
    the Report of Independent Public Accountants on such schedule are
    included in this Registration Statement.  All other schedules are omitted
    because they are not applicable or are  not required under Regulation
    S-X.

    Item 17.  Undertakings.

         (a)       The undersigned Registrant hereby undertakes:

            (1) To file, during any period in which offers or sales are
              being made, a post-effective amendment to this registration
              statement:

                (i)     To include any prospectus required by Section
                    10(a)(3) of the Securities Act of 1933;

                (ii)         To reflect in the prospectus any facts or events
                    arising after the effective date of the registration
                    statement (or the most recent post-effective amendment
                    thereof) which, individually or in the aggregate,
                    represent a fundamental change in the information set
                    forth in the registration statement.  Notwithstanding

                                      II-4
PAGE
<PAGE>





                    the foregoing, any increase or decrease in volume of
                    securities offered (if the total dollar value of
                    securities offered would not exceed that which was
                    registered) and any deviation from the low or high and
                    of the estimated maximum offering range may be reflected
                    in the form of prospectus filed with the Commission
                    pursuant to Rule 424(b) if, in the aggregate, the
                    changes in volume and price represent no more than 20
                    percent change in the maximum aggregate offering price
                    set forth in the "Calculation of Registration Fee" table
                    in the effective registration statement;

                (iii)        To include any material information with respect
                    to the plan of distribution not previously disclosed in
                    the registration statement or any material change to
                    such information in the registration statement.

              Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do
              not apply if the registration statement is on Form S-3 or Form
              S-8, and the information required to be included in a
              post-effective amendment by those paragraphs is contained in
              periodic reports filed by the Registrant pursuant to Section 13
              or Section 15(d) of the Securities Exchange Act of 1934 that
              are incorporated by reference in the registration statement.

           (2)     That, for the purpose of determining any liability under
              the Securities Act of 1933, each such post-effective amendment
              shall be deemed to be a new registration statement relating to
              the securities offered therein, and the offering of such
              securities at that time shall be deemed to be the initial bona
              fide offering thereof.

           (3)     To remove from registration by means of a post-effective
              amendment any of the securities being registered which remain
              unsold at the termination of the offering.

         (b)  Insofar as indemnification for liabilities arising under the
    Securities Act of 1933 may be permitted to directors, officers and
    controlling persons of the Registrant pursuant to the foregoing
    provisions, or otherwise, the Registrant has been advised that in the
    opinion of the Securities and Exchange Commission such indemnification is
    against public policy as expressed in the Act and is, therefore,
    unenforceable.  In the event that a claim for indemnification against
    such liabilities (other than the payment by the Registrant of expenses
    incurred or paid by a director, officer or controlling person of the
    Registrant in the successful defense of any action, suit or proceeding)
    is asserted by such director, officer or controlling person in connection
    with the securities being registered, the Registrant will, unless in the
    opinion of its counsel the matter has been settled by controlling
    precedent, submit to a court of appropriate jurisdiction the question
    whether such indemnification by it is against public policy as expressed
    in the Act and will be governed by the final adjudication of such issue.




                                      II-5
PAGE
<PAGE>





    SIGNATURES

         Pursuant to the requirements of the Securities Act, the Registrant
    has duly caused this Amendment No. 1 to Registration Statement to be
    signed on its behalf by the undersigned, thereunto duly authorized, in
    the City of Danbury, Connecticut, on this ____ day of January 1997.

                                       TREX MEDICAL CORPORATION


                                       By: /s/ Hal Kirshner
                                           -----------------------
                                            Hal Kirshner
                                            Chief Executive Officer,
                                            President and Director

                                   SIGNATURES

         Pursuant to the requirements of  the Securities Act, this  Amendment
    No. 1 to Registration Statement has been signed by the following  persons
    in the capacities and on the dates indicated.

                 Signature                   Title              Date
                 ---------                   -----              ----




       /s/ Hal Kirshner               Chief Executive     January  , 1997
       ---------------------                                      -
       Hal Kirshner                   Officer, President
                                      and Director
                                      (Principal
                                      Executive Officer)



       Gary S. Weinstein*             Director and        January  , 1997
       ----------------------                                     -
       Gary S. Weinstein              Chairman of the
                                      Board



       Anthony J. Pellegrino*         Director and Vice   January  , 1997
       ------------------------                                   -
       Anthony J. Pellegrino          Chairman of the
                                      Board




       John N. Hatsopoulos*           Vice President,     January  , 1997
       -------------------------                                  -
       John N. Hatsopoulos            Chief Financial
                                      Officer and
                                      Director
                                      (Principal
                                      Financial Officer)



                                      II-6
PAGE
<PAGE>








       Paul F. Kelleher*              Chief Accounting    January  , 1997
       -----------------------                                    -
       Paul F. Kelleher               Officer (Principal
                                      Accounting
                                      Officer)




       Dr. Elias P. Gyftopoulos*      Director            January  , 1997
       ---------------------------                                -
       Dr. Elias P. Gyftopoulos











































                                      II-7
PAGE
<PAGE>





       Signature                      Title               Date
       ---------                      -----               ----




                                      Director            January  , 1997
       --------------------------                                 -
       Robert C. Howard



       Earl R. Lewis*                 Director            January  , 1997
       --------------------------                                 -
       Earl R. Lewis



       Dr. James W. May, Jr.*         Director            January  , 1997
       --------------------------                                 -
       Dr. James W. May, Jr.




       Hutham S. Olayan*              Director            January  , 1997
       ------------------------                                   -
       Hutham S. Olayan



       Firooz Rufeh*                  Director            January  , 1997
       ------------------------                                   -
       Firooz Rufeh



                                      Director            January  , 1997
       ---------------------                                      -
       Kenneth Y. Tang


    *    The undersigned Jonathan W. Painter, by signing his name hereto,
    does hereby execute this Amendment No. 1 to Registration Statement on
    behalf of each of the above-named persons pursuant to powers of attorney
    executed by such persons and filed with the Securities and Exchange
    Commission.


                                                 /s/ Jonathan W. Painter
                                                 --------------------------
                                                 Jonathan W. Painter
                                                 Attorney-in-Fact











                                      II-8
PAGE
<PAGE>





                                  EXHIBIT INDEX

    Exhibit
    Number     Description of Exhibit
    -------    ----------------------
     
      3.1      Certificate of Incorporation, as amended, of the
               Registrant (filed as Exhibit 3.1 to the Registrant's
               Registration Statement on Form S-1 [Reg. No. 333-2926]
               and incorporated herein by reference).

      3.2      By-Laws of the Registrant (filed as Exhibit 3.2 to the
               Registrant's Registration Statement on Form S-1 [Reg.
               No. 333-2926] and incorporated herein by reference).

      4.1      Specimen Common Stock Certificate (filed as Exhibit 4.1
               to the Registrant's Registration Statement on Form S-1
               [Reg. No. 333-2926] and incorporated herein by
               reference).

      4.2      $42,000,000 Subordinated Convertible Note due 2000 of
               the Registrant issued to ThermoTrex (filed as Exhibit
               4.2 to the Registrant's Registration Statement on Form
               S-1 [Reg. No. 333-2926] and incorporated herein by
               reference).

       
      5        Opinion of Seth H. Hoogasian, Esq. (previously filed)
        

     10.1      Corporate Services Agreement dated as of September 27,
               1995 between Thermo Electron Corporation (Thermo
               Electron) and the Registrant (filed as Exhibit 10.1 to
               the Registrant's Registration Statement on Form S-1
               [Reg. No. 333-2926] and incorporated herein by
               reference).

     10.2      Thermo Electron Corporate Charter, as amended and
               restated effective January 3, 1993 (incorporated by
               reference herein from Exhibit 10.1 to Thermo Electron's
               Annual Report on Form 10-K for the fiscal year ended
               January 2, 1993 (File No. 1-8002)).

     10.3      Tax Allocation Agreement dated as of September 27, 1995
               between Thermo Electron and the Registrant (filed as
               Exhibit 10.3 to the Registrant's Registration Statement
               on Form S-1 [Reg. No. 333-2926] and incorporated herein
               by reference).

     10.4      Master Repurchase Agreement dated as of September 27,
               1995 between Thermo Electron and the Registrant (filed
               as Exhibit 10.4 to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and
               incorporated herein by reference).



                                      II-9
PAGE
<PAGE>





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

     10.5      Master Guarantee Reimbursement Agreement dated as of
               September 27, 1995 between Thermo Electron and the Registrant
               (filed as Exhibit 10.5 to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and incorporated
               herein by reference)

     10.6      Master Guarantee Reimbursement Agreement dated as of
               September 27, 1995 between ThermoTrex and the
               Registrant (filed as Exhibit 10.6 to the Registrant's
               Registration Statement on Form S-1 [Reg. No. 333-2926]
               and incorporated herein by reference).

     10.7      OEM Agreement between Philips Medical Systems North
               American Company and Lorad dated as of November 2, 1993
               (filed as Exhibit 10.7 to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and
               incorporated herein by reference).

     10.8      OEM Agreement between Philips Medical Systems North
               American Company and Lorad dated November 17, 1993
               (filed as Exhibit 10.8 to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and
               incorporated herein by reference).

     10.9      Purchase Agreement between General Electric Company and
               Bennett dated November 17, 1994 (filed as Exhibit 10.9
               to the Registrant's Registration Statement on Form S-1
               [Reg. No. 333-2926] and incorporated herein by
               reference).

     10.10     Agreement between Philips Medizin Systeme
               Unternehmensbereich der Philips GmbH and Bennett dated
               February 12, 1992 (filed as Exhibit 10.10 to the
               Registrant's Registration Statement on Form S-1 [Reg.
               No. 333-2926] and incorporated herein by reference).

     10.11     Distributor Agreement between ThermoTrex and U.S.
               Surgical Corporation dated October 20, 1995, as amended
               (filed as Exhibit 10.11 to the Registrant's
               Registration Statement on Form S-1 [Reg. No. 333-2926]
               and incorporated herein by reference).

     10.12     Note Purchase and Sale Agreement dated as of October 2,
               1995 between ThermoTrex and the Registrant (filed as
               Exhibit 10.12 to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and
               incorporated herein by reference).






                                      II-10
PAGE
<PAGE>





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

     10.13     Lease dated as of September 15, 1995, by and among
               ThermoTrex and BK Realty Associates, L.P. and Calrob
               Realty Associates (filed as Exhibit 10.26 to
               ThermoTrex's Annual Report on Form 10-K for the fiscal
               year ended September 30, 1995 [File No. 1-10791] and
               incorporated herein by reference).

      10.14    Lease dated as of December 20, 1995, between Melvyn J.
               Powers and Mary P. Powers D/B/A M&M Realty and Lorad,
               as amended (filed as Exhibit 10.14 to the Registrant's
               Registration Statement on Form S-1 [Reg. No. 333-2926]
               and incorporated herein by reference).

      10.15    Equity Incentive Plan of the Registrant (filed as
               Exhibit 10.15 to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and
               incorporated herein by reference).

      10.16    Deferred Compensation Plan for Directors of the
               Registrant (filed as Exhibit 10.16 to the Registrant's
               Registration Statement on Form S-1 [Reg. No. 333-2926]
               and incorporated herein by reference).

      10.17    Directors Stock Option Plan of the Registrant (filed as
               Exhibit 10.17 to the Registrant's Registration
               Statement on Form S-1 [Reg. No. 333-2926] and
               incorporated herein by reference).

      10.18    Form of Indemnification Agreement for Officers and
               Directors (filed as Exhibit 10.18 to the Registrant's
               Registration Statement on Form S-1 [Reg. No. 333-2926]
               and incorporated herein by reference). 

               In addition to the stock-based compensation plans of
               the Registrant, the executive officers of the
               Registrant may be granted awards under stock-based
               compensation plans of Thermo Electron Corporation and
               ThermoTrex Corporation for services rendered to the
               Registrant or such affiliated corporations. Such plans
               were filed as Exhibits 10.21 through 10.44 and 10.73
               through 10.76 to the Annual Report on Form 10-K of
               Thermo Electron for the fiscal year ended December 30,
               1995 [File No. 1-8002] and as Exhibit 10.19 to the
               Registrant's Annual Report on Form 10-K for the fiscal
               year ended September 28, 1996 [File No. 1-11827] and
               are incorporated herein by reference.
    .






                                      II-11
PAGE
<PAGE>





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

      10.19    License Agreement between the Registrant and ThermoTrex
               dated as of October 16, 1995 (filed as Exhibit 10.88 to
               the Registrant's Registration Statement on Form S-1
               [Reg. No. 333-2926] and incorporated herein by
               reference).

      10.20    Stock Holding Assistance Plan and Form of Promissory
               Note (filed as Exhibit 10.21 to the Registrant's Annual
               Report on Form 10-K for the fiscal year ended September
               28, 1996 [File No. 1-11827] and incorporated herein by
               reference).

      10.21    Lease dated May 29, 1996 between John K. Grady, Trustee
               of Concord Associates Foster Street Trust and XRE
               Acquisition Corp. (filed as Exhibit 10.89 to the
               Registrant's Registration Statement on Form S-1 [Reg.
               No. 333-2926] and incorporated herein by reference).

      10.22    Asset Purchase Agreement dated September 4, 1996 by and
               among CXR Acquisition Corp., the Registrant,
               Continental X-Ray Corporation, Alphatek Corporation,
               Broadview Manufacturing Corporation, Haymarket Square
               Associates, Advanced Medical Imaging, Inc.,
               Trans-Continental X-ray Corporation and the
               Stockholders and Partners thereof (filed as Exhibit
               10.21 to the Registrant's Registration Statement on
               Form S-1 [Reg. No. 333-15381] and incorporated herein
               by reference).

      11       Statement re: Computation of Earnings per Share (filed
               as Exhibit 11 to the Registrant's Annual Report on Form
               10-K for the fiscal year ended September 28, 1996 [File
               No. 1-11827] and incorporated herein by reference).

      21       Subsidiaries of the Registrant (filed as Exhibit 21 to
               the Registrant's Registration Statement on Form S-1
               [Reg. No. 333-15381] and incorporated herein by
               reference).

      23.1     Consent of Arthur Andersen LLP.


      23.2     Consent of Seth H. Hoogasian, Esq. (included in Exhibit
               5).

       
      24       Power of Attorney (previously filed).
        





                                      II-12
PAGE
<PAGE>





       
                    Report of Independent Public Accountants
                    ----------------------------------------


    To the Shareholders and Board of Directors of Trex Medical Corporation:

         We have audited, in accordance with generally accepted auditing
    standards, the consolidated financial statements included in Trex Medical
    Corporation's Form S-1 and have issued our report thereon dated November
    1, 1996. Our audits were made for the purpose of forming an opinion on
    the basic consolidated financial statements taken as a whole. Trex
    Medical Corporation's schedule of Valuation and Qualifying Accounts,
    included in Schedule II on page S-2, is the responsibility of the
    Company's management and is presented for purposes of complying with the
    Securities and Exchange Commission's rules and is not part of the basic
    consolidated financial statements. This schedule has been subjected to
    the auditing procedures applied in the audits of the basic consolidated
    financial statements and, in our opinion, fairly states in all material
    respects the financial data required to be set forth therein in relation
    to the basic consolidated financial statements taken as a whole.



                                               Arthur Andersen LLP



    Boston, Massachusetts
    November 1, 1996



























                                       S-4
PAGE
<PAGE>





    Schedule II
                            TREX MEDICAL CORPORATION


                        Valuation And Qualifying Accounts
                                     (In thousands)


                             Balance  Provision                       Balance
                                  at    Charged  Accounts                  at
                           Beginning         to   Written              End of
    Description            of Period    Expense       Off   Other (a)  Period
    -------------------------------------------------------------------------

    Year Ended
      September 28, 1996

        Allowance for
         Doubtful Accounts   $  870     $  273   $ (151)   $  272     $1,264

    Nine Months Ended
      September 30, 1995

        Allowance for
          Doubtful Accounts  $  525     $   25   $    -    $  320     $  870

    Year Ended
      December 31, 1994

        Allowance for
          Doubtful Accounts  $  350     $  175   $    -    $    -     $  525


    (a)  Allowances of businesses acquired during the year as described in
    Note 3 to Consolidated Financial Statements in the Registrant's Fiscal
    1996 Annual Report to Shareholders.

        



















                                       S-5








                                                             Exhibit 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


        To Trex Medical Corporation:

        As independent public accountants, we hereby consent to the use
        of our reports (and to all references to our Firm) included in or
        made a part of this registration statement.



                                                  Arthur Andersen LLP



        Boston, Massachusetts
        January 7, 1997



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