IMATRON INC
S-3, 1996-02-02
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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As filed with the Securities and Exchange Commission on February 1, 1996
                         --Registration No. 33-________

                                    FORM S-3

                       SECURITIES AND EXCHANGE COMMISSION

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                                  IMATRON INC.
                 (Exact name of issuer specified in its charter)

                   New Jersey               94-2880078
              (State of incorporation)    (I.R.S. Employer Identification No.)
                              --------------------
                           389 Oyster Point Boulevard
                          South San Francisco, CA 94080
                                 (415) 583-9964
                   (Address, including zip code and telephone
             number, including area code, of registrant's principal
                               executive offices)
                              --------------------

                                 S. Lewis Meyer
                      President and Chief Executive Officer
                                  Imatron Inc.
                           389 Oyster Point Boulevard
                          South San Francisco, CA 94080
                                 (415) 583-9964
            (Name, address including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:

                              Roger S. Mertz, Esq.
                                Severson & Werson
                       One Embarcadero Center, 25th Floor
                         San Francisco, California 94111
                    ----------------------------------------

Approximate  date of  commencement  of proposed  sale to the public:  As soon as
possible after this Registration Statement becomes effective.

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


<PAGE>


If the only securities  being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box: ( )

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, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box: ( X )
<TABLE>

                         CALCULATION OF REGISTRATION FEE
                  ===========================================

<CAPTION>
                                                                                
Title of           Amount to be     Proposed maximum     Proposed maximum      Amount of
each class         registered       offering  price     aggregate offering    registration fee
of securities                          per share            price  
to be registered                          



<S>                      <C>              <C>                  <C>                   <C>   
Common Stock             2,000,000        $1.81(1)             $3,620,000(1)         $1,248
                         Shares       

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

<FN>
(1)      Estimated  pursuant to Rule 457(c)  solely for purposes of  determining
         the  registration  fee,  based on the average of the high and low sales
         prices on January 23, 1996, as reported on the NASDAQ  National  Market
         System.

</FN>
</TABLE>

The Registrant hereby amends this Registration Statement on such date or date(s)
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  the  Registration  Statement  shall  become
effective on such date as the  Commission  acting  pursuant to said Section 8(a)
may determine.

                                       ii
<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 February 1, 1996

                                   PROSPECTUS

                                2,000,000 Shares

                                  IMATRON INC.

                            Common Stock No Par Value
                              --------------------

     All of the 2,000,000  shares of Common Stock offered  hereby are being sold
by Imatron Inc. (the  "Company" or  "Imatron").  The  Company's  Common Stock is
traded  over-the-counter  on the NASDAQ  National Market System under the symbol
"IMAT." On January 23, 1996 the last reported sale price of the Common Stock was
$1.91 per share.
                              --------------------

                 THESE SECURITIES INVOLVE A HIGH DEGREE OF RISK.
                               SEE "RISK FACTORS."
                              --------------------

          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
            SECURITIES AND EXCHANGE COMMISSION NOR HAS THE COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
              REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- ------------------------------------------------------------------------------
                                                             Proceeds to
                  Price to Public         Commissions        Company(1)

Per Share         $1.91                   $0.13              $1.78
Total             $3,820,000              $267,400           $3,552,600
- ------------------------------------------------------------------------------
     1 Before deduction of offering  expenses,  which are not expected to exceed
$11,748, payable by the Company.

                The Date of this Prospectus is February 1, 1996

                                       1
<PAGE>



                                TABLE OF CONTENTS


AVAILABLE INFORMATION ......................................................   3

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE ............................   3

THE COMPANY ................................................................   4

RISK FACTORS ...............................................................   5

USE OF PROCEEDS ............................................................  12

PRICE RANGE OF COMMON STOCK ................................................  12

PLAN OF DISTRIBUTION .......................................................  13

EXPERTS ....................................................................  13

LEGAL OPINION ..............................................................  13


                                       2
<PAGE>


                              AVAILABLE INFORMATION

         Imatron  Inc.   ("Imatron"   or  the   "Company")  is  subject  to  the
informational  requirements  of the  Securities  and  Exchange  Act of 1934,  as
amended (the "Exchange Act"), and, in accordance therewith, files reports, proxy
statements and other  information  with the  Securities and Exchange  Commission
(the "Commission").  Such reports,  proxy statements and other information filed
by the Company with the Commission can be inspected and copied at Room 1024, 450
Fifth Street, N.W.,  Washington,  D.C. 20549, and at the Regional Offices of the
Commission at Room 1204,  Everett McKinley Dirksen Building,  219 South Dearborn
Street, Chicago,  Illinois 60604; and Room 1102, 26 Federal Plaza, New York, New
York 10007.  Copies of such material can be obtained  from the Public  Reference
Section of the Commission, at 450 Fifth Street, N.W., Washington, D.C. 20549, at
prescribed rates.  Shares of the Company's Common Stock are traded on the NASDAQ
National  Market  System under the symbol  "IMAT."  Information  concerning  the
Company may also be obtained by contacting NASDAQ/NMS.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The Company's  Annual  Report on Form 10-K for the year ended  December
31, 1994,  filed April 11, 1995 (File No.  0-12405) and all amendments  thereto;
the Company's  definitive  Proxy  Statement  filed pursuant to Section 14 of the
Exchange Act in connection with the annual meeting of shareholders  held on June
2, 1995, filed May 1, 1995; the Company's Quarterly Reports on Form 10-Q for the
periods  ending March 31, 1995,  June 30, 1995,  and September 30, 1995 filed on
May 12,  1995,  August 14, 1995 and November  14,  1995,  respectively;  and the
description of the Company's Common Stock contained in a registration  statement
filed under the Exchange  Act,  including  any amendment or report filed for the
purpose of updating such description,  are hereby incorporated by reference into
this Prospectus. All documents filed by the Company with the Commission pursuant
to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this
Prospectus and prior to the termination of the offering of Common Stock shall be
deemed to be  incorporated  by reference  into this  Prospectus and to be a part
hereof from the date of filing of such documents,  except the Board Compensation
Committee Report on Executive Compensation and the Performance Graph included in
the Proxy  Statement  pursuant to Item  402(k) and (l) of  Regulation  S-K.  Any
statement  contained in a document  incorporated  by  reference  herein shall be
deemed to be modified or  superseded  for  purposes  of this  Prospectus  to the
extent  that a statement  contained  herein or in any other  subsequently  filed
document  which  also is or is deemed to be  incorporated  by  reference  herein
modifies or supersedes such  statement.  Any statement so modified or superseded
shall not be deemed,  except as so modified or superseded,  to constitute a part
of this  Prospectus.  The Company  will provide  without  charge to each person,
including any  beneficial  owner,  to whom this  Prospectus  is delivered,  upon
written or oral request of such person, a copy of any and all of the information
that has been  incorporated  by reference in this  Registration  Statement filed
with the  Commission  under the  Exchange  Act with  respect to the Common Stock
offered by the Prospectus,  other than certain exhibits to such documents.  Such

                                       3

<PAGE>

requests  should be directed to the Chief Financial  Officer,  Imatron Inc., 389
Oyster Point Boulevard,  South San Francisco,  California  94080,  telephone no.
(415) 583-9964.

                                   THE COMPANY

         Imatron  is a  technology-based  company  principally  engaged  in  the
business of designing,  manufacturing, and marketing a high performance computed
tomography  (CT)  scanner  that uses a scanning  electron  beam.  CT refers to a
diagnostic  imaging device in which  cross-sectional  (tomographic)  images of a
patient's  anatomy are acquired from  multiple  intensity  readings  taken as an
x-ray source rotates around the patient. Ultrafast CT technology is more than 20
times faster than conventional  computed  tomography,  enabling users to perform
certain tests involving  organs in motion (e.g. the heart) that no other medical
imaging equipment is able to perform.

         For over a decade,  the  scanner  has been used in large and  mid-sized
hospitals and free standing imaging clinics.  The Company also provides service,
parts,  and maintenance to hospitals and clinics that operate its scanners.  The
technological  advantage provided by high-speed  tomography now provides Imatron
the opportunity to develop a new and additional  market,  by performing  simple,
low cost,  non-invasive  screening to detect the earliest signs of heart disease
by means of the  Coronary  Artery Scan  ("CAS").  This vast new market  involves
activity in both diagnostic services and equipment manufacturing.

         The Company is also  engaged in the related  businesses  of  performing
research and development for itself and others in the field of CT devices and of
licensing its patents and know-how in the field of imaging sciences.

         Imatron was incorporated in New Jersey in February, 1983. Its executive
offices  are  located  at 389  Oyster  Point  Boulevard,  South  San  Francisco,
California 94080, and its telephone number is (415) 583-9964.

         In 1993, Imatron organized  HeartScan  Imaging,  Inc. as a wholly-owned
subsidiary  to develop and operate a network of  company-owned  coronary  artery
disease  risk  assessment  centers  in  cooperation  and  conjunction  with  the
established medical (primarily  cardiology)  community in specific  metropolitan
areas. In that same year, HeartScan opened a test facility adjacent to Imatron's
headquarters.  In July,  1995, it opened its first coronary  artery disease risk
assessment center in Seattle, Washington. In January, 1996, it opened its second
facility in Houston,  Texas. It plans to open similar  facilities in Washington,
D.C. and Pittsburgh, Pennsylvania, in May, 1996. HeartScan's centers deliver the
CAS diagnostic test together with other risk factor tests in a manner consistent
with established channels of patient referral,  as well as with the new channels
of  patient  referral  being  created  by health  care  reform and the growth of
managed-care systems.

         A  significant  component of  HeartScan's  approach is to offer the CAS


                                       4

<PAGE>

procedure and a full battery of coronary artery disease risk assessment  testing
to consumers without necessarily  requiring a physician's  referral, an approach
designed to result in more rapid  acceptance of the test and a shorter return on
the  investment  cycle.  This is  achieved  by means of two broad  and  mutually
supportive  approaches - increasing  the number of coronary  artery disease risk
assessment  centers in operation,  which in turn,  both directly and indirectly,
increases  the  demand  for  Imatron's   C-150/Evolution  scanner  currently  in
distribution.  HeartScan management believes that the market for coronary artery
disease risk assessment centers is very large and that HeartScan's comprehensive
heart disease screening approach is both revolutionary and highly effective.

     HeartScan  Imaging,  Inc. was incorporated in Delaware in March,  1993. Its
executive  offices are  currently  co-located  with those of Imatron Inc. at 389
Oyster Point Boulevard, South San Francisco, California 94080, and its telephone
number is (415) 583-9964.

                                  RISK FACTORS

         The securities offered hereby are speculative and involve a high degree
of risk.  Prospective  investors  may  lose  all or a part of their  investment.
Consequently,  the  following  factors,  in  addition  to the other  information
contained in this Prospectus,  should be considered  carefully in evaluating the
Company and its business before purchasing the securities offered hereby:

         Short Operating History. Imatron was incorporated in February, 1983 and
in March, 1983 became the successor to Imatron Associates, a limited partnership
established in February,  1981. Imatron operated as a development-stage  company
until the fourth  quarter of 1984, at which time it recognized  its initial sale
of an  ULTRAFAST  CT(R)  scanner.  Imatron  incurred  losses each  quarter  from
inception in  February,  1981 through  December  31,  1990.  Its first  recorded
profitable  year was the year ended  December 31, 1991 during which a $4,000,000
payment for the licensing of technology to Siemens Corporation was received. The
Company  incurred net losses of  $2,871,000  and  $6,523,000  in the years ended
December 31, 1993 and 1992,  respectively.  1994 was the Company's first year of
profit from operations.  Through  September 30, 1995, the Company incurred a net
loss of $297,000.  There is no assurance that Imatron can operate  profitably in
the future.  In the past,  Imatron has funded its losses  primarily  through the
sale of securities in two public  offerings and a number of private  placements,
through  the  exercise  of options and  warrants,  through the 1991  license for
medical uses of its electron-beam technology to Siemens Corporation, and through
revolving  lines of credit.  Recently,  the  Company  raised  $9,957,700  in two
offerings of Common Stock to certain institutional investors.

         Need for Additional Financing.  To satisfy the Company's future capital
and  operating  requirements,  profitable  operations  or  additional  public or
private  financing  will be required.  If future public or private  financing is
required by the Company,  holders of the  Company's  securities  may  experience
dilution. If such financing cannot be obtained,  the Company may seek to sell or
license additional portions of its technology,  to sell some or all of its other

                                       5

<PAGE>

assets or to merge with another company. In addition,  HSI will need substantial
additional  financing to fund its plan to own and operate CAS  clinics.  To date
HSI has been  unable to raise  such funds and has relied  upon the  Company  for
financing.  In the event HSI cannot raise such funds it will have to curtail its
expansion activities.

         Material  Dependence Upon Key Personnel.  The Company has been and will
continue  to be  materially  dependent  upon  the  technical  expertise  of  its
engineering  management  personnel.  The loss of a  significant  number  of such
personnel would have a materially adverse effect upon the Company's business and
future prospects. The Company does not maintain key-man life insurance.

         High Cost of Scanner. The distributor list price of Imatron's ULTRAFAST
CT  scanner  is  significantly  higher  than  that  of  commercially   available
conventional  CT  scanners  and  higher  than  the  price  of  "top-of-the-line"
scanners.  Such pricing may limit the market for  Imatron's  product.  Potential
customers'  budgetary   limitations,   including  those  imposed  by  government
regulation,  may often  compel  the  purchase  of lower  cost,  conventional  CT
scanners.

         Limited  Clinical  Demonstration  of Certain  Advantages  of  Company's
Scanner.  The  Company's  scanners have been used in a clinical  environment  on
humans since April, 1983.  Clinical use of a scanner containing the new features
of the C-150 model began in August,  1992,  and 47 C-150  scanners are currently
installed in a clinical setting.  Imatron's worldwide installed base consists of
62 CT scanners.  The Company believes that market acceptance of the ULTRAFAST CT
scanner continues to depend in substantial part upon the clinical  demonstration
of certain asserted technological advantages and diagnostic capabilities.  There
is no  assurance  that these  advantages  will  result in the  development  of a
significant  market for the  ULTRAFAST CT that will allow the Company to operate
profitably.

         Product  Liability  Risks.  As a  manufacturer  and marketer of medical
diagnostic  equipment,  the Company is subject to  potential  product  liability
claims.  For example,  the  exposure of normal human tissue to x-rays,  which is
inherent  in the use of CT  scanners  for  diagnostic  imaging,  may  result  in
potential  injury to  patients,  thereby  subjecting  the  Company  to  possible
liability  therefor.  The Company presently maintains primary and excess product
liability  insurance with  aggregate  limits of $5,000,000  per  occurrence.  No
assurance can be given that the Company's product liability  insurance  coverage
will  continue  to be  available  or, if  available,  that it can be obtained in
sufficient amounts or at reasonable cost or that it will prove sufficient to pay
any claims that may arise.

         Reliance on Product  Development.  Imatron continually seeks to develop
product enhancements and improve product  reliability.  Imatron's future success
may depend on its ability to complete  certain  product  enhancement and product
reliability projects currently in progress,  as well as on its continued ability
to develop new products or product enhancements in response to new products that
may be introduced  by other  companies.  There can be no assurance  that Imatron
will be able to  continue  to improve  product  reliability,  or  introduce  new

                                       6

<PAGE>

product models or product enhancements as required to remain competitive.

         Reliance on Patents and Proprietary Technology.  Imatron relies heavily
on proprietary technology. Imatron is the exclusive sublicensee under one patent
expiring in 1999 held by the  University  of California  ("UC")  relating to the
general concept of the ULTRAFAST CT scanner.  Imatron holds the exclusive rights
under the patent  pursuant to a sublicensee  agreement  with Emersub,  Inc. (the
"Sublicensor"),  a wholly owned  subsidiary  of Emerson  Radio  Corp.,  a former
principal shareholder of Imatron. Pursuant to the sublicense agreement,  Imatron
is obligated to pay to the  Sublicensor a continuing  royalty of 2.125% of sales
of  products  utilizing  the  technology  (2.0%  of  which  would be paid by the
Sublicensor  to UC).  Loss by Imatron of its rights under the patent as a result
of  termination  of its  sublicense  from  the  Sublicensor,  or the  underlying
license, could have a material adverse effect upon Imatron's business and future
prospects.  There are no present disputes with either UC or the Sublicensor.  In
March,  1995, the Company entered into a Memorandum of Understanding (the "MOU")
with  Siemens  Corporation  ("Siemens").  Pursuant to the terms of the MOU,  the
Company  transferred  all of its interest in five United States  patents and all
foreign corresponding patents to Siemens in exchange for cancellation of a loan.
Imatron  retained a  non-exclusive  irrevocable  and  perpetual  royalty-bearing
license under the transferred patents.

         In addition,  Imatron holds 27 U.S.  patents of its own and has filed 3
U.S. patent  applications  covering  various  integral  elements of the scanner,
including,  among others,  its X-ray  detector and its electron  beam  assembly.
Imatron has filed applications corresponding to several of the U.S. applications
in various European Patent Convention countries,  Canada and Japan. There can be
no  assurance  that any such  applications  will  result in the  issuance of any
patents to  Imatron.  Imatron's  patents and patent  applications  have not been
tested in litigation and no assurance can be given that patent  protection  will
be upheld or will be as extensive as claimed.  Furthermore,  no assurance can be
given as to Imatron's  ability to finance  litigation  against parties which may
infringe upon such patents or defend litigation against Imatron by parties which
may claim that Imatron's scanner infringes upon their patents.

         In the  event  some or all of the  Company's  patent  applications  are
denied and/or some or all of its patents are held invalid,  the Company would be
prevented from  precluding its competitors  from using the protected  technology
set forth in such patent applications or patents. Because the Company's products
involve confidential  proprietary  technology and know-how, the Company does not
believe such a loss of patent rights would have a material  adverse  effect upon
the Company.

         Limited or Single  Sources  of Supply.  The  Company  manufactures  its
scanners at its South San Francisco,  California  facility.  To date the typical
manufacturing cycle has required at least four months. Based on inventory,  lead


                                       7

<PAGE>

time can be  significant  between the receipt of an order and the  shipment of a
scanner.

         Many of the components and sub-assemblies used in the scanner have been
developed  and  designed  by  Imatron  to  its  custom  specifications  and  are
obtainable  from limited or single sources of supply.  In view of the customized
nature of many of these  components and  sub-assemblies,  there may be long lead
times between  order and shipment of scanners.  Delays in delivery of components
and   sub-assemblies   could  adversely  affect  Imatron's  present  and  future
production  schedules.  The Company  has made and  continues  to make  inventory
investments to acquire long lead time components and  sub-assemblies to minimize
the impact of such delays.

         Disruption  or  termination  of limited or sole sources of supply could
have a  temporary  adverse  effect on the  Company's  ability to meet  scheduled
delivery dates. In recent years, the Company has developed  alternative  sources
for many of its scanner  subcomponents  and  continues  its  programs to qualify
vendors for the remaining critical parts.

         Food  and  Drug  Administration  and  Other  Governmental   Regulation.
Amendments to the Federal Food, Drug, and Cosmetic Act ("Amendments") enacted in
1976, and regulations issued or authorized thereunder, provide for regulation by
the Federal Food and Drug Administration ("FDA") of the marketing,  manufacture,
labeling,  packaging,  sale and distribution of "medical devices," including the
Company's scanner.  Among these regulations are requirements that medical device
manufacturers register their manufacturing facilities with the FDA, list devices
manufactured  by them,  file  various  reports and comply with  specified  "Good
Manufacturing   Practice"  (GMP)  regulations.   The  FDA  enforces   additional
regulations  regarding the safety of equipment  utilizing  x-rays,  including CT
scanners. Various states also impose similar regulations.

         The Amendments also impose certain requirements which must be met prior
to the initial  marketing of certain  medical  devices  introduced into commerce
after May 28, 1976. These range from a minimum  obligation to wait 90 days after
notification to the FDA before  introduction  of medical  devices  substantially
equivalent  to  devices  on the  market  prior  to May 28,  1976,  to a  maximum
obligation to comply with the potentially  expensive and time-consuming  process
of obtaining FDA authorization prior to the commercial  marketing of new medical
devices. The Company has received appropriate  clearances from the FDA to market
both the  C-100 XL and  C-150  ULTRAFAST  CT  scanner  and  believes  that it is
presently  in  substantial  compliance  with  the  GMP  requirements  and  other
regulatory issues promulgated by the FDA.

         The FDA,  through its Center for Devices and  Radiological  Health (the
"Center"),  also  regulates  the safety and  efficacy of  radiological  devices.
Although  the  Company   believes  it  is  in  compliance  with  all  applicable
radiological health standards and regulations  promulgated by the Center,  there
can be no assurance  that the  ULTRAFAST CT scanner will continue to comply with
all such  standards  and  regulations  that may be  promulgated.  In any  event,

                                       8

<PAGE>

compliance with all such  requirements can be costly and time consuming,  with a
resultant  materially  adverse  effect  upon the  development  of the  Company's
business and its future profitability.

         FDA  clearance to market does not guarantee or imply  reimbursement  by
third party payers such as Medicare, Medicaid, Blue Cross/Blue Shield or private
health  insurers.  Medicare  and  Medicaid  reimburse  for  procedures  that are
generally accepted or that have been proven safe and effective.  The Health Care
Financing  Administration  ("HCFA"),  which oversees Medicare and Medicaid, will
not authorize  payment for procedures  which are considered to be  experimental.
HCFA has determined that diagnostic  examinations of the head and other parts of
the body performed by CT scanners are covered if the contractor who  administers
the local  Medicare  program finds that medical and  scientific  literature  and
opinion support the effective use of a scan for the particular condition.

         The Federal government and certain states have enacted cost-containment
measures  such as the  establishment  of maximum fee  standards in an attempt to
limit the extent and cost of  governmental  reimbursement  of allowable  medical
expenses under Medicare, Medicaid and similar governmental programs. A number of
states have adopted or are  considering the adoption of similar  measures.  Such
limitations  have led to a reduction in, and may further  limit funds  available
for the purchase of diagnostic  equipment  such as the Company's  scanner and in
the number of  diagnostic  imaging  procedures  performed in hospitals and other
medical institutions such as imaging clinics.

         Federal  legislation  also  requires  states  participating  in Federal
medical expense  reimbursement  and funding programs to adopt  requirements that
hospitals and other health care facilities,  such as imaging  clinics,  obtain a
Certificate  of Need ("CON") for major capital  expenditures,  in the absence of
which they will be denied  reimbursement  for services  and funding  relating to
such  capital  expenditures.  A number of states have  enacted  CON  legislation
beyond Federal  requirements,  such as requiring private  physicians to obtain a
CON for any CT  scanner,  regardless  of cost.  There can be no  assurance  that
Imatron's potential customers will be able to secure CON's or will be willing to
pursue the application procedure.

         The health care industry is highly  regulated.  The  implementation  of
certain  health care reforms  currently  being  considered  by the executive and
legislative branches of the federal government may directly affect the Company's
business.  Both existing and future  governmental  regulations  could  adversely
impact the market  for the  Company's  ULTRAFAST  CT scanner  and the  Company's
business.  The  Company's  operations  are also subject to  regulation  by other
federal,  state and local  governmental  entities empowered to enforce pertinent
statutes and regulations,  such as those enforced by the Occupational Safety and
Health Agency and the  Environmental  Protection  Agency. In some cases state or
local  regulations  may be  stricter  than  regulations  imposed by the  federal
government.  The Company was most recently  inspected by the State of California
Department of Occupational Safety and Health  Administration in November,  1993.
Minor violations were identified by Cal/OSHA and were  immediately  corrected by

                                       9

<PAGE>

the Company.  Follow up  inspection  by Cal/OSHA  yielded  satisfactory  results
without  issuance of further notice of violation.  The Company believes it is in
substantial compliance with California regulations.

         Volatility of Stock Price. The market prices for securities of advanced
technology  companies  have  historically  been highly  volatile,  including the
market price of shares of the Company's  Common Stock.  Future  announcements by
the Company or its competitors, including announcements concerning technological
innovations or new commercial products,  results of clinical testing, changes in
government  regulations,  regulatory  actions,  health care reform,  proprietary
rights,  litigation and public concerns as to the safety of the Company's or its
collaborators'  products,  as well as  period-to-period  variances  in financial
results  could  cause  the  market  price  of  the  Common  Stock  to  fluctuate
substantially.  In addition,  the stock market has experienced extreme price and
volume  fluctuations that have  particularly  affected the market price for many
advanced  technology  companies  that have often been unrelated to the operating
performance of these  companies.  These broad market  fluctuations may adversely
affect the market price of the Common Stock.

         Competition.  The Company  competes  with a number of other  diagnostic
imaging equipment  manufacturers.  The Company's  principal  competition is from
current  manufacturers of conventional CT scanners,  including  General Electric
Company,  Siemens  Corporation,  Elscint,  Picker  International,  Inc., Philips
Electronics,  B.V., and Toshiba  Corporation.  Non-invasive  diagnostic  imaging
techniques  such  as  ultrasound,   radioisotope  imaging,  digital  subtraction
angiography and magnetic  resonance imaging are also partially  competitive with
the Company's scanners,  particularly in the cardiac imaging market. Each of the
companies named above markets  equipment using one or more of these  techniques.
All of these  companies  have greater  financial  resources  and larger and more
established  staffs  than those of the Company  and their  products  are in most
cases substantially less expensive than the ULTRAFAST CT scanner.

         The  Company  believes  that  to  compete  successfully  against  these
competitors,  it must  demonstrate  that the  ULTRAFAST  CT  scanner  is both an
acceptable substitute for conventional CT scanners in scanning areas of the body
where motion is not a limitation and a valuable cardiac  diagnostic tool capable
of producing useful images of the heart.  Although the Company believes that the
ULTRAFAST  CT can  produce  images of a  quality  and  resolution  as good as or
superior to images produced by  state-of-the-art  conventional  CT scanners,  it
lacks certain features that many competing premium scanners offer. These include
lack of a high-resolution  mode for imaging the temporal bones and inner ear and
lower functionality in software used for automatically  positioning the patient.
There is no certainty  that potential  purchasers of the Company's  scanner will
accept it without such features.

         Also,  the Company  believes that  customers  and  potential  customers
expect a continuing development effort to improve the functionality and features
of the scanner.  The Company  continually seeks to develop product  enhancements
and improve  product  reliability.  Imatron's  future  success may depend on its

                                       10

<PAGE>

ability to complete certain product enhancement and product reliability projects
currently  in  progress,  as well as on its  continued  ability to  develop  new
products  or  product  enhancements  in  response  to new  products  that may be
introduced by other  companies.  There can be no assurance  that Imatron will be
able to continue to improve product  reliability or introduce new product models
or product enhancements as required to remain competitive.

         Other factors,  in addition to those described above,  that a potential
purchaser  would consider in the decision to replace a  conventional  CT scanner
with  an  ULTRAFAST  CT  scanner  include  purchase  price,  patient  throughput
capacity,  anticipated  operating expenses,  estimated useful life and post-sale
customer  service and support.  The Company believes that its scanner and/or the
Company is competitive with respect to each of these factors.

     Agreements with Siemens  Corporation.  In March,  1991, the Company entered
into several related  agreements  with Siemens  Corporation  ("Siemens").  These
agreements  and the  Company's  relationship  with  Siemens  were  substantially
restructured in March, 1995. The Company transferred all of its interest in five
patents subject to a  royalty-bearing  license back in exchange for cancellation
of a loan. The parties also substituted for the existing Development Agreement a
collaborative  research  agreement  pursuant to which they will jointly  conduct
research and development over a three-year period to improve the Company's C-150
product. Siemens was appointed the Company's exclusive distributor for the C-150
scanner in the United  States,  Canada,  Europe and India.  The Company  retains
exclusive  distribution rights in the rest of the world. The Company and Siemens
also granted reciprocal licenses to each other covering electron beam technology
relating to the design and  manufacture of electron beam  products.  Siemens has
recently  asserted a claim  against the Company  regarding  the lapse of certain
foreign  registrations  of one of the patents assigned to Siemens by the Company
in  connection  with the March 31, 1995  agreement  between the  companies.  The
technology  involved in the patent is not used presently in any of the Company's
products. In the Company's opinion, the resolution of this claim is not expected
to have a material effect on the financial position of the Company, but it could
be  material to the net income of a  particular  future  quarter  (or year),  if
resolved unfavorably.

         Reliance on Distributors.  A substantial portion of the Company's sales
of its scanners is done  through  distributors.  There is no assurance  that the
Company's distributors will actually meet their contractual minimums on a timely
basis.  Failure by the  distributors to meet their  obligations  could adversely
affect the Company.

         No Dividends on Preferred  and Common  Stock.  The Company has not paid
any  dividends on its  Preferred or Common  Stock since  inception.  Even if its
future operations result in revenues and/or profitability, as to which there can
be no assurance,  there is no present  anticipation that dividends will be paid.
Rather,  the Company expects that any future earnings will be applied toward the
further development of the Company's business.

                                       11

<PAGE>

                                 USE OF PROCEEDS

         The  proceeds  to be  received  by the  Company  from  the  sale of the
2,000,000  shares of Common Stock  offered by the Company  hereby,  based on the
assumed  public  offering  price of $1.91 per share,  will be  $3,820,000,  less
payment  of any  commissions  and  other  expenses  of the  offering,  which are
expected  to  be  approximately   $279,148.   While  Imatron  currently  has  no
commitments for use of the net proceeds of the offering, it anticipates that the
proceeds  will be used in several  main  areas,  including  the  development  of
domestic and  international  markets  ($500,000),  the establishment of clinical
research and customer  demonstration  facilities  ($1,000,000),  advances to its
subsidiary  HeartScan Imaging,  Inc. to finance  HeartScan's  operations pending
completion  of that  company's  current  round of  financing  ($1,040,000),  the
expansion  of  clinical  research  programs,  and the  development  of  clinical
applications for its products ($1,000,000) (all amounts are approximations).  If
substantially  less than the maximum  proceeds  are  obtained,  the Company will
apply the proceeds  toward those uses in the order of priority in which they are
set forth in the  preceding  sentence.  To the extent  that the  proceeds of the
offering are not used for these  purposes,  they will be used to reduce accounts
payable and for other general corporate purposes.

                           PRICE RANGE OF COMMON STOCK

         Imatron's Common Stock is traded in the over-the-counter  market on the
NASDAQ  National Market System under the symbol "IMAT." The following table sets
forth,  for the calendar  quarters  indicated,  the high and low sales prices as
reported by the NASDAQ/NMS.

                                              High                      Low
                                              ----                      ---

Year Ended December 31, 1994

         First Quarter ......................$ 2.06                  $ 0.50
         Second Quarter .................... $ 1.88                  $ 0.81
         Third Quarter ..................... $ 1.41                  $ 0.88
         Fourth Quarter .................... $ 1.56                  $ 0.88

Year Ended December 31, 1995

         First Quarter ..................... $ 1.31                  $ 0.97
         Second Quarter .................... $ 1.22                  $ 0.81
         Third Quarter ..................... $ 3.53                  $ 0.81
         Fourth Quarter .................... $ 2.97                  $ 1.47

                                       12

<PAGE>


Period Ended January 23, 1996

         First Quarter ..................... $ 2.34                  $ 1.72


         On January 23, 1996, the last reported sales price of Imatron's  Common
Stock was $1.91.

                              PLAN OF DISTRIBUTION

         The Company  shall offer the Shares on a  "best-efforts"  basis through
its own  efforts  using  its  salaried  employees  without  the  payment  of any
commission, and through the efforts of various placement agents who will receive
commissions in an amount not to exceed 7% of the gross proceeds of the offering.
None of the  placement  agents are  obligated or intend  themselves  to take (or
purchase)  any of the  Common  Stock.  The Shares  will be  offered  and sold in
privately negotiated transactions.

         There is no  minimum  number  of  Shares  that must be sold in order to
declare this offering effective.  Accordingly, all net proceeds from the sale of
Shares  will be paid  directly  to the  Company  and will not be held in  escrow
pending  receipt  of  any  minimum  amount  of  proceeds.  There  is no  minimum
subscription amount of Shares that an investor must purchase.  No investor funds
will be accepted  prior to  effectiveness  of the  Registration  Statement.  The
offering has no predetermined termination date.

         No persons have made any firm  commitment as to the number of Shares to
be purchased by them.  There can  accordingly  be no assurance  that  sufficient
funds will be received to accomplish any of the anticipated uses of the proceeds
of this offering.

                                     EXPERTS

     The  consolidated  financial  statements  of Imatron Inc.  appearing in the
Company's  Annual Report (Form 10-K) for the year ended December 31, 1994,  have
been audited by Ernst & Young LLP, independent  auditors,  as set forth in their
report  thereon  included  therein and  incorporated  herein by  reference.  The
consolidated  financial statements have been incorporated herein by reference in
reliance  upon such report  given upon the  authority of such firm as experts in
accounting and auditing.
                                  LEGAL OPINION

         The legality of the shares of Common Stock  offered will be passed upon
for  the  Company  by  Severson  &  Werson,  A  Professional  Corporation,   One
Embarcadero Center, 26th Floor, San Francisco, CA 94111.


                                       13

<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 in
connection  with the offer made hereby.  If given or made,  such  information or
representation must not be relied upon as having been authorized by Imatron Inc.
This  Prospectus  does not constitute an offer to sell or a  solicitation  of an
offer to buy any securities other than those  specifically  offered hereby or an
offer  to buy to any  person  in any  jurisdiction  in  which  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 time  subsequent to the
date hereof.




                                2,000,000 Shares

                                                                               
                                  IMATRON INC.

                               No Par Common Stock


                                   

                                   PROSPECTUS



                               February 1, 1996



                                      


<PAGE>


                 PART II. INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.   Other Expenses of Issuance and Distribution


         The following  table sets forth all expenses  payable by the Company in
connection  with  the  issuance  and  distribution  of the  Common  Stock  being
registered. All the amounts shown are estimates except for the registration fee.

            Registration fee.............................................$1,248

            Printing and engraving expenses.......  ....................... 500

            Legal fees and expenses1................ .................... 7,500

            Accounting fees and expenses................................  2,500
                                                                          -----

            Total.......................................................$11,748

ITEM 15.  Indemnification of Directors and Officers

         Article IX of the Bylaws of the Company  sets forth the extent to which
officers or directors of the Company may be indemnified  against any liabilities
which they may incur.  The general  effect of such Bylaw  provision  is that any
person made a party to an action,  suit or proceeding by reason of the fact that
he is or was a  director,  officer,  employee  or  agent of the  Company,  or of
another  corporation or other  enterprise which he served as such at the request
of the Company,  shall be indemnified by the Company against expenses (including
attorneys' fees),  judgments,  fines and amounts paid in settlement actually and
reasonably incurred by it in connection with such action, suit or proceeding, to
the full extent permitted under the laws of the State of New Jersey.

         The  general  effect of the  indemnification  provisions  contained  in
Section  14A: 3-5 of the New Jersey  General  Corporation  Law is as follows:  A
director  or officer  who, by reason of such  directorship  or  officership,  is
involved in any  action,  suit or  preceding  (other than an action by or in the
right  of the  Company)  may be  indemnified  by the  Company  against  expenses
(including  attorneys'  fees),  judgments,  fines and amounts paid in settlement
actually and reasonably  incurred by him in connection with such action, suit or
proceeding if he acted in good faith and in a manner he  reasonably  believed to
be in or not opposed to the best  interest of the Company,  and, with respect to
any criminal action or proceeding,  had no reasonable  cause to believe that his
conduct was unlawful.  A director or officer who, by reason of such directorship
or  officership,  is  involved  in any  action or suit by or in the right of the
Company may be indemnified by the Company against expenses (including attorneys'
fees) actually and reasonably  incurred by him in connection with the defense or



                                        1
<PAGE>

settlement  of such  action or suit if he acted in good faith and in a manner he
reasonably  believed  to be in or not  opposed  to  the  best  interests  of the
Company,  except  that no  indemnification  may be made in respect of any claim,
issue or  matter  as to which he shall  have  been  adjudged  to be  liable  for
negligence or misconduct in the  performance  of his duty to the Company  unless
and only to the extent that a court of  appropriate  jurisdiction  shall approve
such indemnification.

ITEM 16.  Exhibits

Exhibit No.       Description

3.1               Certificate of Incorporation of the Company, as amended, as of
                  March 31, 1983(1)

3.2               Certificate of Amendment of Certificate of Incorporation      
                  filed with the New Jersey Secretary of State on June 7, 1988
                  (2)

3.3               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on June 17, 1988 (3)

3.4               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on July 26, 1988 (4)

3.5               Certificate of Correction of Certificate of Amendment of
                  Certificate of Incorporation filed with the New Jersey
                  Secretary of State on February 7, 1989 (5)

_________________________________________

     1  Filed as an Exhibit to the Company's Registration Statement on Form S-1
     filed with the Commission on June 1, 1983 (File No. 2-84146) and 
     incorporated herein by reference.

     2  Filed as an Exhibit to the Company's Registrations Statement on Form S-8
     filed with the Commission on February 3, 1989 (File No.33-26833) and 
     incorporated herein by reference.

     3  Filed as an Exhibit to the Company's Form 8 amending the Company's 
     Annual Report on Form 10-K for the fiscal year ended December 31, 1988 
     filed with the Commission on May 2, 1989 and incorporated hereby by 
     reference.

     4  Filed as an Exhibit to the Company's Registration Statement on Form S-8
     filed with the Commission on February 3, 1989 (File No. 33-26833) and 
     incorporated herein by reference.

                                       2

<PAGE>
                  1989 (5)
  
3.6               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on March 29, 1990 (6)

3.7               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on December 7, 1990 (7)

3.8               Bylaws, as amended as of April 30, 1992 (8)

4.1               Note 6 to Consolidated Financial Statements of the Company
                  dated December 31, 1994 (9)

5.1               Opinion of Counsel as to the legality of securities being
                  registered.

24.1              Consent of Independent Auditors.

24.2              Consent of Counsel.  Reference is made to Exhibit 5.1.

25.1              Power of Attorney (contained in signature pages).


____________________________________________

     5  Filed as an Exhibit to the Company's Form 8 amending the Company's 
     Annual Report on Form 10-K for the fiscal year ended December 31, 1988 
     filed with the Commission on May 2, 1989 and incorporated hereby by
     reference.

     6  Filed as an Exhibit to the Company's Annual Report on Form 10-K for the
     fiscal year ended December 31, 1989 and incorporated herein by reference.

     7  Filed as an Exhibit to the Company's Registration Statement on Form S-8
     filed with the Commission on May 6, 1991 (File No. 33-40391) and 
     incorporated herein by reference.

     8  Filed as an Exhibit to Post-Effective Amendment No. 1 to the Company's
     Registration Statement on Form S-3 filed with the Commission on May 5, 1992
     (File No. 33-32218) and incorporated herein by reference.

     9  Filed as part of the Company's Annual Report on Form 10-K for the fiscal
     year ended December 31, 1994 and incorporated herein by reference.

                                     3

<PAGE>


ITEM 17.  Undertakings

         A.       Rule 415 Offering

         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;

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

                  (4) To deliver or cause to be delivered  with the  prospectus,
to each person to whom the prospectus is sent or given, the latest annual report
to security  holders that is  incorporated  by reference in the  prospectus  and
furnished  pursuant to and meeting the  requirements of Rule 14a-3 or Rule 14c-3
under  the  Securities  Exchange  Act of  1934;  and,  where  interim  financial
information  required to be presented by Article 3 of Regulation S-X are not set
forth in the prospectus,  to deliver, or cause to be delivered to each person to
whom the  Prospectus  is sent or given,  the  latest  quarterly  report  that is
specifically incorporated by reference in the prospectus to provide such interim
financial information.


                                       4

<PAGE>

         B. Filings Incorporating Subsequent Exchange Act Documents By Reference

         The Company hereby  undertakes  that,  for purposes of determining  any
liability under the Securities Act of 1933, each filing of the Company's  annual
report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act
of 1934 that is incorporated by reference in the registration statement shall be
deemed to be a new registration  statement  relating to the securities  offering
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

         C.  Acceleration of Effectiveness

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors,  officers and controlling  persons of
the Company pursuant to the foregoing provisions,  or otherwise, the Company has
been advised that in the opinion of the Securities and Exchange  Commission such
indemnification is against public policy as expressed in the Securities Act, and
is,  therefore,  unenforceable.  In the event  that a claim for  indemnification
against  such  liabilities  (other  than the  payment by the Company of expenses
incurred or paid by a director,  officer or controlling person of the Company 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 Company  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  Securities  Act and will be  governed by the final
adjudication of such issue.


                                       5

<PAGE>


                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of South San Francisco, State of California, on February
1, 1996
                                  IMATRON INC.


                                          By:  s/S. Lewis Meyer
                                          ---------------------
                                                 S. Lewis Meyer
                                          President and Chief Executive Officer



                                       6
<PAGE>


                                POWER OF ATTORNEY


         KNOW ALL PERSONS BY THESE  PRESENTS,  that each person whose  signature
appears below  constitutes  and appoints  Douglas P. Boyd and S. Lewis Meyer, or
either of them,  his true and lawful  attorney-in-fact,  each with full power of
substitution  for him in any and all capacities,  to sign any and all amendments
(including  post-effective  amendments) to this registration  statement,  and to
file the same,  with all exhibits  thereto,  and other  documents in  connection
therewith,  with the Securities and Exchange  Commission,  hereby  ratifying and
confirming all that each of said  attorneys-in-fact  or their or his substitutes
or substitute, may do or cause to be done by virtue hereof.

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

   Signature                       Title                                 Date
  
/s/ S. LEWIS MEYER           President, Chief Executive         February 1, 1996
- ------------------           Officer and Director    
    S. Lewis Meyer               

/s/ DOUGLAS P. BOYD          Chairman of the Board              February 1, 1996
- -------------------
    Douglas P. Boyd

/s/ GARY H. BROOKS           Vice President Finance and         February 1, 1996
- ------------------           Chief Financial Officer
    Gary H. Brooks                            

/s/ UGO BUSATTI              Director                           February 1, 1996
- ---------------
    Ugo Busatti

/s/ JOHN L. COUCH            Director                           February 1, 1996
- -----------------
    John L. Couch

/s/ GIOVANNI LANZARA         Director                           February 1, 1996
- --------------------
    Giovanni Lanzara

/s/ TERRY ROSS               Director                           February 1, 1996
- --------------
    Terry Ross

/s/ ALDO TEST                Director                           February 1, 1996
- -------------
    Aldo Test


                                       7

<PAGE>


                                  IMATRON INC.

                          INDEX TO EXHIBITS FILED WITH
                         FORM S-3 REGISTRATION STATEMENT

                        2,000,000 Shares of Common Stock


Sequential
Exhibit No.                Description                                Page No.
- -----------                -----------                                --------
                

5.1                        Opinion of Counsel as to legality             10
                            of securities being registered.
  
24.1                       Consent of independent auditors.              13

24.2                       Consent of counsel.

                           Reference is made to Exhibit 5.1.

25.1                       Power of Attorney (contained in signature pages)



                                       8



<PAGE>

                                   Exhibit 5.1



                                SEVERSON & WERSON
                           A PROFESSIONAL CORPORATION
                                ATTORNEYS AT LAW
                             ONE EMBARCADERO CENTER
                         SAN FRANCISCO, CALIFORNIA 94111

                               FAX (415) 956-0439
                            TELEPHONE (415) 398-3344



                                February 1, 1996







Imatron Inc.
389 Oyster Point Blvd.
South San Francisco, CA 94080

Gentlemen:

         You have  requested  our  opinion  with  respect to certain  matters in
connection  with the filing by Imatron Inc. (the  "Company")  of a  Registration
Statement on Form S-3 (the  "Registration  Statement")  with the  Securities and
Exchange  Commission  covering  the  offering of up to  2,000,000  shares of the
Company's Common Stock (the "Shares").

         In connection  with this opinion,  we have examined and relied upon the
Registration  Statement and related  Prospectus,  the Company's  Certificate  of
Incorporation  and  Bylaws,  as  amended,  and such  other  records,  documents,
certificates,  memoranda and other  instruments as in our judgment are necessary
or  appropriate  to enable us to render the  opinion  expressed  below.  We have
assumed the  genuineness and  authenticity  of all documents  submitted to us as
originals,  the  conformity  to  originals of all  documents  submitted to us as
copies  thereof,  and the due execution  and delivery of all documents  were due
execution and delivery are a prerequisite to the effectiveness thereof.

         We do not hold ourselves out as experts in the laws of the State of New
Jersey and our  opinion is based  solely on a review of the New Jersey  Business
Corporation Act, as reported in unofficial compilations.


                                       9

<PAGE>


         On the basis of the foregoing,  and in reliance thereon,  we are of the
opinion that:

         The Shares,  when sold and issued in accordance  with the  Registration
Statement  and related  Prospectus,  will be validly  issued,  fully  paid,  and
nonassessable.

         This opinion is intended  solely for your benefit and is not to be made
available to or be relied upon by any other person,  firm or entity  without our
prior written consent.

         We  consent  to  the  filing  of  this  opinion  as an  exhibit  to the
Registration Statement.


                                             SEVERSON & WERSON
                                             A Professional Corporation


                                             By: /s/ Roger S. Mertz
                                             ----------------------
                                                     Roger S. Mertz



RSM:pa

                                       10


<PAGE>





                                  EXHIBIT 24.1



                         Consent of Independent Auditors


     We consent to the reference to our firm under the caption  "Experts" in the
Registration Statement (Form S-3 No. 33-00000) and related Prospectus of Imatron
Inc. for the  registration  of  2,000,000  shares of its common stock and to the
incorporation by reference therein of our report dated February 17, 1995, except
for  Note  11 as to  which  the  date is  April  4,  1995  with  respect  to the
consolidated  financial  statements  of  Imatron  Inc.  included  in its  Annual
Report(Form  10-K)  for the  year  ended  December  31,  1994,  filed  with  the
Securities and Exchange Commission.

                                                          Ernst & Young LLP



San Francisco, California
January 31, 1995




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