IMATRON INC
S-3, 1996-06-25
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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As filed with the Securities and Exchange Commission on June 25, 1996
                               --Registration No.
================================================================================

                                    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, California 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, California 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
practicable 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 )

                         CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------

Title of                             Proposed        Proposed 
Each Class                           Maximum         Maximum  
of Securities       Amount to        Offering        Aggregate     Amount of    
to Be               Be               Price Per       Offering      Registration 
Registered          Registered       Share           Price         Fee          
- -------------       -----------      ----------      ---------     -------------
                                                
Common              6,283,700        $5.75           $36,131,275   $12,459.04
Stock               Shares           (1)             (1)           
                                                     


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

(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 June 18,  1996,  as  reported on the NASDAQ  National  Market
         System.

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 JUNE 21, 1996

                                   PROSPECTUS

                                6,283,700 Shares

                                  IMATRON INC.

                            Common Stock No Par Value

         This Prospectus relates to the sale of up to 6,283,700 shares of Common
Stock,  no par value,  of Imatron Inc. (the  "Company") by  shareholders  of the
Company (the "Selling Shareholders").  A total of 4,000,000 shares are currently
issued and outstanding (the "Outstanding  Shares");  a total of 2,283,700 shares
are issuable upon the exercise of  outstanding  warrants (the  "Warrants")  (the
"Warrant  Shares").  All  of  the  Outstanding  Shares  and  the  Warrants  were
previously  issued  by  the  Company  to the  Selling  Shareholders  in  private
transactions.  The  Outstanding  Shares and the Warrant Shares are  collectively
referred to in this Prospectus as the "Shares." The Selling  Shareholders intend
to sell the Shares from time to time in open market and/or private sales,  or by
any other appropriate method.

         The Company will receive  proceeds upon the exercise of the Warrants by
the Selling Shareholders, but will not receive any of the proceeds from the sale
of the Shares.  The Company has agreed to bear all of the expenses in connection
with the registration (but not the sale) of the Shares.

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

                 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.

                  The Date of this Prospectus is June 21, 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

OFFERING PRICE.......................................................... 12

SELLING SHAREHOLDERS.................................................... 12

PLAN OF DISTRIBUTION.................................................... 14

EXPERTS................................................................. 14

LEGAL OPINION........................................................... 14


                                        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, 1995,  filed March 29, 1996 (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 to be held on
June 28, 1996,  filed April 29, 1996; the Company's  Report on Form 10-Q for the
period ended March 31, 1996,  filed on May 15, 1996; 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
requests  should be directed to the Chief Financial  Officer,  Imatron Inc., 389
Oyster Point Boulevard, South San Francisco,  California 94080, telephone number
(415) 583-9964.

                                        3
<PAGE>

                                   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 July, 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
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

                                        4
<PAGE>

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 April,  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 April, 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.  In 1995, the Company incurred a net loss of $2,449,000.
There is no assurance  that Imatron can return to  profitable  operations 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.  In 1995, the Company raised $9,882,000 (net of offering costs)
in two offerings of Common Stock to certain institutional investors. The Company
has an accumulated deficit of $57,557,000.

         Management   believes  that  cash,  cash   equivalents  and  short-term
investments  existing  at  December  31, 1995 and the  estimated  proceeds  from
ongoing  sales of products  and  services in 1996 will  provide the Company with
sufficient  cash for  operating  activities  and  capital  requirements  through
December 31, 1996.

         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
assets or

                                        5
<PAGE>

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 the C-100 XL scanner  model began in
February  1989 and  twenty-seven  C-150  scanners are  currently  installed in a
clinical  setting.  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  claims.  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 Patents And Proprietary Technology.  Imatron relies heavily
on proprietary technology which it attempts to protect through patents and trade
secrets.

         In February  1981,  the Company was granted the  exclusive use for five
years and  non-exclusive  use  thereafter  of  certain  technology  and a patent
pending owned by the University of California  (UC) under the terms of a license
agreement  between  UC  and  Emersub,  a  wholly-owned  subsidiary  of a  former
principal shareholder of the Company, and a sublicense agreement between Emersub
and Imatron Associates (the predecessor to the Company), respectively. In

                                        6
<PAGE>

June 1986,  the license and  sublicense  agreements  were  amended to extend the
Company's  exclusive use of the technology  through the remaining 9-year life of
the patent in exchange for modified minimum annual royalty  payments.  Under the
terms of  Emersub's  license  with UC,  Emersub was  obligated  to make  certain
additional payments in connection with the license. In October 1990, pursuant to
subsequent  amendments  of the license and  sublicense  agreements,  the Company
issued an  aggregate  of 132,813  shares of Series A  Preferred  Stock to UC and
Emersub  in  satisfaction  of this  obligation.  The  University  of  California
converted  their  125,000  Series A Preferred  Stock into  625,000  common stock
shares in 1993.  Emersub  converted  their 7,813  Series A Preferred  Stock into
39,065 common stock shares in September 1995.

         In addition, the sublicense agreement, as amended, requires the Company
to pay annual  royalties  to Emersub  equal to 2.125% of net sales of certain of
the Company's  products.  The Company's  Chairman of the Board,  Dr.  Douglas P.
Boyd, receives 6% of all of the royalties paid by Emersub to UC. Loss by Imatron
of its rights under the patent as a result of termination of its sublicense from
Emersub,  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 Emersub.

         Development of portions of the technology  covered by the UC patent and
sublicensed  to Imatron has been funded in  substantial  part  through  research
financing made available to UC by the National Institutes of Health. As a result
of such  financing,  it is possible that the U. S. Government may assert certain
claims in such UC patents,  including  the right to a  royalty-free  license for
governmental use.

         In addition,  Imatron holds  twenty-seven U.S. Patents of its own (each
with a  remaining  life in excess of 3 years) and has filed  three  U.S.  patent
applications  covering  various  integral  components of the scanner  including,
among others,  its electron  beam assembly and its x-ray  detector and has filed
applications  corresponding  to several of these  patents  and  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 a patent to
the Company.  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
the Company's ability to finance  litigation  against parties which may infringe
upon  such  patents  or  parties  which  may claim  that the  Company's  scanner
infringes upon their patents.  However,  the agreement signed by the Company and
Siemens Corporation in March 1991 allows Siemens Corporation to enter litigation
in favor of Imatron.

         On March 31,  1995,  the Company and  Siemens  Corporation  ("Siemens")
entered into an agreement (the "Memorandum of  Understanding")  relating in part
to certain of the  Company's  patents.  Pursuant to the  agreement,  the Company
transferred  to  Siemens  five  patents,  two of  which  cover  features  of the
Company's C-150 scanner, in consideration of the cancellation by Siemens of a $4
million term loan to the Company.  As part of the agreement  Siemens  granted to
the Company a non-exclusive, irrevocable, perpetual license to the five patents.
The license

                                        7
<PAGE>
is  subject to a royalty of  $20,000  for each new C-150  unit  produced  by the
Company beginning with the twenty-first C-150 unit produced in any year.

         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. The Company believes that it can provide a new patent to
Siemens to replace the lapsed  patent.  While the resolution of the claim is not
expected to have a material effect on the Company's  financial position it could
however,  have a material  effect on the results of  operations  of a particular
future period if resolved unfavorably.

         In the  event  some or all of the  Company's  patent  applications  are
denied  and/or some or all of its patents  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.

         The Company also believes that many of its proprietary technologies are
better  protected  as trade  secrets or  copyrights  than by patents.  Moreover,
although  protection  of the  Company's  existing  proprietary  technologies  is
important,  other  factors  such as product  development,  customer  support and
marketing  ability are equally  important to the  development  of the  Company's
business.

         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 six months based on inventory. Lead time can be
significant between authorization of manufacturing to delivery 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 extended
delays between their order and deliver.  Delays in such delivery 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. 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.

         Also,  certain vendors  currently  require  cash-on-delivery  or prepay
payment  terms.  There can be no assurance  that such actions will not adversely
affect the Company's  production schedule and its ability to deliver products in
a timely manner. As a result of certain vendors

                                        8
<PAGE>

currently requiring  cash-on-delivery or prepay terms, the Company must maintain
higher  levels of cash and other  sources of credit to fund  material  purchases
than otherwise would be required.

         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.

         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 medical devices  introduced into commerce after May
28, 1976. Other requirements imposed on medical device  manufacturers  include a
pre-market  notification  process  commonly  known as the 510(k)  application to
market a new or modified  medical  device.  Additionally,  and  specifically  if
required by the FDA, a pre-market approval ("PMA") may be required. This process
is  potentially  expensive  and time  consuming  and must be completed  prior to
marketing a new medical device. The Company has received appropriate  clearances
from the FDA to  market  both the  C-100 and C-150  ULTRAFAST  CT  scanner.  The
Company  believes that it is presently in  substantial  compliance  with the GMP
requirements and other regulatory issues promulgated by the FDA.

         The FDA also regulates the safety and efficacy of radiological devices.
Although  the  Company   believes  it  is  in  compliance  with  all  applicable
radiological  health  regulations  promulgated  by  the  FDA,  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, compliance with
all such requirements can be costly and time consuming, with a resultant

                                        9
<PAGE>

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 payment
policies,  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.

         Certain  states have  adopted  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 more  stringent  CON  legislation
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  CONs or will  be  willing  to  pursue  the  application
procedure.

         The Company's primary customers operate in the healthcare industry. The
health care industry is highly regulated.  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 issued by Cal/OSHA and
were immediately  corrected by the Company.  The subsequent follow up inspection
in December by the same regulatory body yielded satisfactory results without the
issuance of further  notice of  violation.  The Company  believes  that it is in
substantial compliance with California regulations applicable to its business.

                                       10
<PAGE>

         Competition.  In the non-cardiac imaging  applications market (composed
principally  of  hospital  radiology   departments),   the  Company's  principal
competition is from current manufacturers of conventional CT scanners, including
General Electric Company,  Siemens Corporation,  Elscint,  Picker International,
Inc.,  Philips Medical Systems,  and Toshiba Medical  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
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.

         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.

                                       11
<PAGE>
         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.

                                 USE OF PROCEEDS

         The Company will not receive any part of the proceeds  from the sale of
the  Shares  by  the  Selling   Shareholders.   As  described   under   "Selling
Shareholders",  a  portion  of the  Shares  will  be  acquired  by  the  Selling
Shareholders upon exercise of the Warrants.  Upon the exercise of a Warrant, the
Company will receive the  applicable  exercise  price per share from the Selling
Shareholder.  The Company will use such  proceeds,  if any, to increase  working
capital.

                                 OFFERING PRICE

         This  Prospectus  may  be  used  from  time  to  time  by  the  Selling
Shareholders who offer the Common Stock registered hereby for sale. The offering
price of such Common Stock will be determined by the Selling Shareholder and may
be based on market price  prevailing at the time of sale, at prices  relating to
such prevailing market prices, or at negotiated  prices. The market price of the
Company's Common Stock on the date of any proposed sale, as listed on the NASDAQ
National Market System, symbol "IMAT", is the most significant but not the only,
factor used to determine the offering price of the Shares.

                              SELLING SHAREHOLDERS

         The following  provides certain  information with respect to the Common
Stock  beneficially  owned by the Selling  Shareholders  who are entitled to use
this  Prospectus.  The  information  in the  table  is as of the  date  of  this
Prospectus. The Common Stock offered by this Prospectus may be offered from time
to time by the Selling Shareholders named below or their nominees:


Name of Selling        Shares          Shares Available       Percent Owned     
Securityholder         Beneficially    for Sale Under         After Completion  
                       Owned(1)        this Prospectus        of the Offering(2)
- ---------------        ------------    ----------------       ------------------

Comptoir Prive           105,800            21,800                  *   
de Gestion S.A.                                                         
                                                                        
                                                                        
CUF Finance               48,373            27,373                  *   
S.A.                                                                    
                                                                        
                                       12
<PAGE>

Wood Gundy               109,091           109,091                  *      
(London) Ltd.                                                           
                                                                        
M. Fund Sicav            193,636            43,636                  *   
                                                                        
The Gifford               81,800            81,800                  *   
Fund, Ltd.                                                              
                                                                        
Jose Maria             3,395,455         2,700,000(4)               *   
Salema Garcao(3)                                                        
                                                                        
Luis Jorge Serras        600,000           600,000                  *   
                                                                        
Jose Laranjeiro          905,455           500,000                  *   
Osvaldo Gomes                                                           
                                                                        
Armando Jose             400,000           400,000                  *   
Rinaldi Balbi                                                           
                                                                        
Eduardo Guedes           200,000           200,000                  *     
de Queiroz de                                                         
Mendia                                                                  
                                                                        
Carlos Spynola           200,000           200,000                  *   
Teixeira                                                                
                                                                        
Dr. Jose Diogo           100,000           100,000                  *   
Ferreira Martins                                                        
                                                                        
Maria Madalena           100,000           100,000                  *   
Bello Pimentel                                                          
                                                                        
Jose Antonio             100,000           100,000                  *   
Reymao Nogueira                                                         
                                                                        
Jose Filipe Nobre        100,000           100,000                  *   
Guedes                                                                  
                                                                        
Banco Espirito         1,000,000         1,000,000                  *   
Santo                                                                   
Internacional                                                        
                                                                        
All Selling            7,639,610         6,283,700                 1.5%        
Shareholders as a                                                 
Group                                                             

                                                       
- -----------------------------
* Less than 1%

                                       13
<PAGE>

(1)      Includes  shares owned prior to this  offering and the shares which are
         issuable  upon  the  exercise  of the  Warrants  held  by  the  Selling
         Shareholders. The number of shares being offered hereby is shown in the
         "Shares Available for Sale Under this Prospectus"  column, and includes
         shares issuable upon exercise of Warrants. See footnote (2) below.

(2)      Percentages are based upon the assumption  that, upon the completion of
         this offering,  the  respective  Selling  Security  holder has sold the
         Common  Stock  listed  as  "Shares   Available   for  Sale  Under  this
         Prospectus"  and are  computed  on the  basis of  71,239,500  shares of
         Common Stock issued and outstanding as of June 4, 1996.

(3)      Maria Luisa  Garcao  shares power to dispose of the Shares held by Jose
         Maria Salema Garcao.

(4)      Includes  2,000,000  shares  which are  issuable  upon the  exercise of
         Warrants held by the selling Shareholder.

                              PLAN OF DISTRIBUTION

         The  Company  has been  advised by the  Selling  Shareholders  that the
Selling  Shareholders  intend  to  sell  their  Shares  from  time  to  time  in
transactions  on the NASDAQ  National  Market  System,  in privately  negotiated
sales,  or by other  appropriate  methods.  Such sales may be made to purchasers
directly by the Selling Shareholders or through underwriters, dealers or agents,
who may receive compensation in the form of underwriting discounts,  concessions
or commissions from the Selling Shareholders and/or the purchasers of shares for
whom  they  may act as  agents,  although  the  Selling  Shareholders  have  not
expressed any present intention of using any underwriters in connection with the
sale of the shares of Common Stock covered by this Prospectus.

         The Company will pay all of the expenses  incident to the  registration
of the Shares.  The Company will not pay any  expenses  incident to the offering
and sale of the  Common  Stock to the  public,  including,  but not  limited  to
commissions and discounts of underwriters, dealers or agents.

                                     EXPERTS

         The consolidated  financial statements of Imatron Inc.  incorporated by
reference and appearing in Imatron Inc.'s Annual Report (Form 10-K) for the year
ended  December  31, 1995,  have been audited by Ernst & Young LLP,  independent
auditors, as set forth in their report thereon included therein and incorporated
herein by reference.  Such  consolidated  financial  statements are 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, California 94111.

                                       14
<PAGE>
 No  dealer,   salesman  or  any  other
 person has been authorized to give any 
 information    or    to    make    any
 representation  not  contained in this          6,283,700 Shares
 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            IMATRON INC.
 offer to buy any securities other than
 those  specifically  offered hereby or         No Par Common Stock
 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             PROSPECTUS
 shall under any  circumstances  create
 any  implication  that the information
 contained  herein is correct as of any
 time subsequent to the date hereof.   




                                                   June 21, 1996



                                       15

<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.1  All the amounts  shown are estimates  except for the  registration
fee.

                  Registration fee............................... $12,460.00

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

                  Legal fees and expenses2.......................   5,000

                  Accounting fees and expenses...................   3,500

                           Total................................. $21,460.00

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


- --------
     1 Including legal expenses associated with Blue Sky filings.

     2 Including legal expenses associated with Blue Sky filings.

                                       16
<PAGE>

may be indemnified by the Company against expenses  (including  attorneys' fees)
actually  and  reasonably  incurred  by him in  connection  with the  defense or
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, 1983.3

3.2               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on June 7, 1988.4

3.3               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on June 17, 1988.5

3.4               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on July 26, 1988.6

3.5               Certificate  of  Correction  of  Certificate  of  Amendment of
                  Certificate  of  Incorporation   filed  with  the  New  Jersey
                  Secretary of State on February 7, 1989.7

3.6               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on April 29, 1990.8

- --------

     3 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.


     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.

     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 herein by reference.

     6 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.

     7 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 herein by reference.

     8 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.

                                       17
<PAGE>

3.7               Certificate of Amendment of Certificate of Incorporation filed
                  with the New Jersey Secretary of State on December 7, 1990.9

3.8               Bylaws, as amended as of April 30, 1992.10

4.1               Form of Common Stock Purchase  Warrant which expires  December
                  31, 2000,  issued to investors in connection  with the Private
                  Offering which concluded October 19, 1995.11

4.2               Form of Registration  Rights Agreement between the Company and
                  investors in the Private Offering which concluded  October 19,
                  1995.12

4.3               Common  Stock  Purchase  Agreement  between  the  Company  and
                  investors in a private sale dated May 24, 1996.

4.4               Common Stock Warrant  Purchase  Agreement  between the company
                  and Jose Maria Salema Garcao dated May 24, 1996.

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).

- --------

     9 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.

     10 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.

     11 Filed as an Exhibit to the Company's  Registration Statement on Form S-3
filed with the Commission on May 10, 1996 (File No.  333-3529) and  incorporated
herein by reference.

     12 Filed as an Exhibit to the Company's  Registration Statement on Form S-3
filed with the Commission on May 10, 1996 (File No.  333-3529) and  incorporated
herein by reference.

                                       18

<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;

                           (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  Exchange  Act that  are  incorporated  by
reference in this Registration Statement.

                  (2) That, for the purpose of determining  any liability  under
the Securities Act, 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 Exchange Act; 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.

                                       19

<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, each filing of the Company's  annual report
pursuant  to  Section  13(a)  or  Section  15(d)  of the  Exchange  Act  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 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.

                                       20
<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 June 15,
1996.

                                       IMATRON INC.


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


                                       21
<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, as amended,
this  Registration  Statement  has been signed by the  following  persons in the
capacities and on the dates indicated.

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

S. LEWIS MEYER              President, Chief                 June 21, 1996
- --------------              Executive Officer and  
S. Lewis Meyer              Director               
                            
                            
DOUGLAS P. BOYD             Chairman of the Board            June 21, 1996
- ---------------
Douglas P. Boyd


GARY H. BROOKS              Vice President Finance,          June 21, 1996
- --------------              Chief Financial Officer, 
Gary H. Brooks              and Chief Accounting     
                            Officer                  
                            

JOHN L. COUCH               Director                         June 21, 1996
- -------------
John L. Couch


                            Director                         June 21, 1996
- ----------------
Giovanni Lanzara

TERRY ROSS                  Director                         June 21, 1996
- ----------
Terry Ross


ALDO TEST                   Director                         June 21, 1996
- ---------
Aldo Test


                                       22
<PAGE>


                                  IMATRON INC.

                          INDEX TO EXHIBITS FILED WITH
                         FORM S-3 REGISTRATION STATEMENT

                        6,283,700 Shares of Common Stock


Sequential
Exhibit No.    Description                                           Page No.
- -----------    -----------                                           --------
4.3            Common Stock Purchase Agreement between                  24
               Company and Investors in a Private Sale dated 
               May 24, 1996.                                 
               
 
4.4            Common Stock Warrant Purchase Agreement                  38
               between Company and Jose Maria Salema Garcao 
               dated May 24, 1996.                          
               
    
5.1            Opinion of Counsel as to legality of securities          45
               being registered.+


24.1           Consent of independent auditors.                         48

24.2           Consent of counsel.                                      46
               
               Reference is made to Exhibit 5.1.

25.1           Power of Attorney (contained in signature pages)         22

                                       23




                                   Exhibit 4.3


                                       24

<PAGE>
                         COMMON STOCK PURCHASE AGREEMENT

         THIS COMMON STOCK PURCHASE AGREEMENT is made as of May 24, 1996 between
IMATRON  INC.,  a New  Jersey  corporation  (the  "Company"),  and  each  of the
purchasers  (individually a "Purchaser" and collectively the "Purchasers") whose
names  and  authorized  signatures  appear on the  signature  page  hereto  (the
"Signature Page").

                                R E C I T A L S:

         WHEREAS,  the Company has  authorized  the issuance and sale outside of
the United States of 4,000,000 shares of its Common Stock (the "Shares"); and

         WHEREAS,  the Purchasesr  desire to purchase and the Company desires to
sell the Shares on the terms and conditions set forth herein.

         NOW,  THEREFORE,  in  consideration  of these  premises  and the mutual
covenants and agreements herein contained and other valuable consideration,  the
receipt and adequacy of which the parties hereto  acknowledge,  the parties have
agreed as follows:

         1.  Purchase  and Sale of  Shares.  The  Company  agrees to sell to the
Purchasers and upon the basis of the representations and warranties, and subject
to the  terms  and  conditions,  set forth in this  Agreement,  the  Purchasers,
severally  but not jointly,  agree to purchase that number of the Shares for the
purchase price set forth opposite such Purchaser's name on the Signature Page.

         2.  Closing; Escrow. The closing of the purchase and sale of the Shares
pursuant  to Section 1 hereof  shall take  place on May 24,  1996 (the  "Closing
Date").  At the Closing each of the Purchasers  shall deliver the purchase price
for such  Purchaser's  Shares into an Imatron  Escrow  Account at Silicon Valley
Bank (Acct. # 3300 14953) subject to the terms and  conditions  hereinafter  set
forth. The Company shall promptly cause certificates to be issued evidencing the
Shares to be purchased by each Purchaser and shall hold such certificates  until
the registration  statement provided for in Section 7 below (the "Registration")
shall have been declared effective by the Securities and Exchange  Commission at
which time such certificates  shall be delivered to the Purchasers in accordance
with  their  instructions.  In the  event  the  Registration  shall  not have be
declared  effective by July 24, 1996,  upon written  notice to the Company given
within sixty (60) days  thereafter,  each Purchaser shall be entitled to rescind
the  purchase  and  sale  of  the  Shares  acquired  by  such  Purchaser  and to
immediately receive back from the Company the Purchase Price paid therefor.

         3.  Representations  and Warranties of the Purchasers.  Each Purchaser,
severally  but not jointly,  represents  and  warrants to, and agrees with,  the
Company:

             (a)  This  Agreement  has  been  duly  authorized,   executed,  and
delivered by the Purchaser and is a valid and binding  agreement  enforceable in
accordance  with  its  terms,  subject  to  bankruptcy,  insolvency,  fraudulent
transfer, reorganization,  moratorium, and similar laws of general applicability
relating to or affecting creditors' rights generally and to general principles

                                       25
<PAGE>

of equity; and the Purchaser has full corporate power and authority necessary to
enter into this Agreement and to perform its obligations hereunder.

             (b) No  consent,  approval,  authorization,  or order of any court,
governmental  agency  or  body,  or  arbitrator  having  jurisdiction  over  the
Purchaser  is required  for  execution  of this  Agreement,  including,  without
limitation,  the purchase of the Shares,  or the  performance of the Purchaser's
obligations hereunder.

             (c) The Purchaser  understands  that no federal or state agency has
passed on or made any recommendation or endorsement of the Shares.

             (d) The Company has given the  Purchaser  the  opportunity  to have
answered  all of the  Purchaser's  questions  concerning  the  Company  and  its
business and has made  available to the Purchaser all  information  requested by
the  Purchaser  which is  reasonably  necessary  to verify the accuracy of other
information  furnished by the Company.  The Purchaser has received and evaluated
all  information  about the Company and its business  which the Purchaser  deems
necessary to formulate an investment  decision,  and does not desire any further
information.

             (e) The Purchaser understands that the Shares are being offered and
sold to him or her or it in reliance on specific  exemptions or  non-application
from the  registration  requirements  of  federal  and  state  securities  laws,
including,  including  but not  limited  to the  exemptions  provided  for under
Regulation S ("Regulation S") and Regulation D ("Regulation D") under the United
States  Securities  Act of 1933, as amended (the  "Securities  Act").  Except as
otherwise  defined herein,  capitalized terms used herein and not defined herein
shall have the same meanings given to them in Regulation S and Regulation D. The
Purchaser  further  understands  that the Company is relying  upon the truth and
accuracy of the representations,  warranties, agreements,  acknowledgements, and
understandings  of the  Purchaser  set forth  herein in order to  determine  the
applicability of such exemptions or non-applications  and the suitability of the
Purchaser to acquire the Shares.

             (f) The Purchaser is not a U.S. Person (as defined in Regulation S)
and is not an affiliate of the Issuer.

             (g) No offer of the Shares was made to the  Purchaser in the United
States and at the time the buy order for the Shares was originated the Purchaser
was located outside the United States.

                  (h) The  Purchaser  is  aware  that the  Shares  have not been
registered  under the Securities Act and may be offered or sold only pursuant to
registration under the Securities Act or an available exemption  therefrom.  The
Purchaser  is  acquiring  the Shares for  investment  and  without  any  present
intention to engage in a distribution thereof.

             (i) The  Purchaser  is either  (i)  acquiring  the  Shares  for the
Purchaser's  own  account;  or (ii) for the  account  of  another  for which the
Purchaser  acts as a fiduciary,  in which case the Purchaser  will so advise the
Company. If acting as a fiduciary, the Purchaser makes

                                       26
<PAGE>

the  representations,  warranties,  and covenants as set forth herein on its own
behalf and as agent for and on behalf of such other party.

             (j) The Purchaser has the knowledge and experience in financial and
business matters to evaluate the merits and risks of the proposed investment.

             (i) The  Purchaser  is an  "Accredited  Investor"  as that  term is
defined  under Rule 501 adopted  pursuant  to the  Securities  Act.  "Accredited
Investors"  are  defined  in Rule 501 to  include,  among  others:  (1)  Various
specified institutional investors (such as banks, savings and loan associations,
licensed brokers or dealers,  insurance companies,  investment companies,  small
business investment companies, employee benefit plans having assets in excess of
$5,000,000,  and self-directed plans having investment  decisions made solely by
persons  that are  Accredited  Investors);  (2) Any entity with total  assets in
excess of  $5,000,000,  not formed for the  specific  purpose of  acquiring  the
securities  offered;  (3) Any  person  who had  individual  income  in excess of
$200,000 in each of the two most recent years or joint income with that person's
spouse  in  excess  of  $300,000  in each of those  years  and has a  reasonable
expectation  of reaching the same income  level this year;  (4) Any person whose
individual  net worth (or joint net worth with the person's  spouse) at the time
of purchase  exceeds  $1,000,000;  (5) Directors  and executive  officers of the
Company; (6) Trusts with total assets in excess of $5,000,000 not formed for the
specific purpose of acquiring the securities offered, whose purchase is directed
by a sophisticated  person prescribed in Rule 506(b)(2)(ii);  and (7) Any entity
in which all the equity owners are deemed accredited.

             (k) The Purchaser:  (i) will not,  during the period  commencing on
the Closing Date and ending upon on the effective date of the Registration  (the
"Restricted  Period"),  offer or sell the Shares in the United States, to a U.S.
Person  or for  the  account  or  benefit  of a U.S.  Person  or  other  than in
accordance  with  Rule 903 or 904 of  Regulation  S;  and (i)  will,  after  the
expiration of the Restricted Period,  offer, sell, pledge, or otherwise transfer
the  Shares  only  pursuant  to  registration  under  the  Securities  Act or an
available  exemption  therefrom and, in any case, in accordance  with applicable
state and foreign securities laws.

             (l) No Purchaser, or any affiliate or other person acting on behalf
of the  Purchaser  or any such  affiliate  has engaged,  or will engage,  in any
Directed Selling Efforts with respect to the Shares or any distribution, as that
term is used in the definition of Distributor, with respect to the Shares.

             (m) The transactions  contemplated by this Agreement:  (i) have not
been pre-  arranged  with a purchaser  located in the United  States or who is a
U.S. Person; and (ii) are not part of a plan or scheme to evade the registration
provisions of the Securities Act.

             (n) The Purchaser  has no put options,  short  positions,  or other
similar instruments with respect to any of the Company's  securities and has not
entered and does not have the intention of entering,  into any such  instruments
with respect to the Shares or securities of the same class.


                                       27
<PAGE>

             (o) If the  Purchaser  offers  and  sells  the  Shares  during  the
Restricted Period, then it will do so only (i) in accordance with the provisions
of  Regulation  S,  (ii)  pursuant  to  registration  of the  Shares  under  the
Securities   Act,  or  (iii)  pursuant  to  an  available   exemption  from  the
registration requirements of the Securities Act.

             (p)  The  Purchaser   understands   that  each  share   certificate
evidencing the Shares will bear a legend reflecting the foregoing.

         4.  Representations   and  Warranties  of  the  Company.   The  Company
represents and warrants to, and agrees with, the Purchaser that:

             (a) The Shares:  (i) are free and clear of any security  interests,
liens, claims, or other encumbrances; (ii) have been duly and validly authorized
and  issued  and  are,  and  on  the  Closing  Date  will  be,  fully  paid  and
non-assessable;  (iii) will not have been, individually and collectively, issued
or sold in violation of any  pre-emptive  or other similar rights of the holders
of any securities of the Company;  and (iv) will not subject the holders thereof
to personal liability by reason of being such holders.

             (b) There is no pending or, to the best  knowledge  of the Company,
threatened  action,  suit,  proceeding,   or  investigation  before  any  court,
governmental  agency or body, or arbitrator having jurisdiction over the Company
or any of its  affiliates  that would  materially  affect the  execution  by the
Company of, or the  performance by the Company of its  obligations  under,  this
Agreement.

             (c) The Company is a reporting issuer as defined in Regulation S.

             (d) The sale of the Shares  pursuant to this Agreement will be made
in  accordance  with  the  provisions  and  requirements  of  Regulation  S  and
Regulation D and applicable state or foreign law.

             (e) No  offer to buy the  Shares  was  made to the  Company  by any
person in the United States.

             (f) None of the  Company,  any  affiliate  of the  Company,  or any
person  acting on behalf of the Company or any such  affiliate  has engaged,  or
will engage,  in any Directed  Selling Efforts with respect to the Shares or any
distribution,  as  that  term is used in the  definition  of  Distributor,  with
respect to the Shares.

             (g) The transactions  contemplated by this Agreement:  (i) have not
been  prearranged  with a purchaser who is in the United States or who is a U.S.
Person;  and (ii) are not part of a plan or  scheme  to evade  the  registration
provisions of the Act.

             (h) Neither the Company,  nor any affiliate of the Company, nor any
person  acting on their behalf,  has  undertaken or carried out any activity for
the  purpose  of, or that could  reasonably  be  expected to have the effect of,
conditioning  the market in the United States for any of the Shares,  including,
but not limited to, general solicitation activities or advertising.

                                       28
<PAGE>

         5.  Restrictions on Transferability of Shares

             (a) Restrictions on Transferability.  The Shares shall not be sold,
assigned,  transferred or pledged  except upon the conditions  specified in this
Agreement,   which  conditions  are  intended  to  ensure  compliance  with  the
provisions  of the  Securities  Act.  Each  Purchaser  will  cause any  proposed
purchaser,  assignee,  transferee, or pledgee of the Shares to agree to take and
hold such securities subject to the provisions and upon the conditions specified
in this Agreement.

             (b) Restrictive  Legends.  Until the sale or transfer of the Shares
by the Purchasers shall be subject to an effective registration under Securities
Act, each certificate representing the Shares and any other securities issued in
respect   of  such   securities   upon  any   stock   split,   stock   dividend,
recapitalization, merger, consolidation or similar event shall (unless otherwise
permitted  by the  provisions  of  Section  7 below)  be  stamped  or  otherwise
imprinted with the following  legends (in addition to any legend  required under
applicable state securities laws):

         "THESE  SECURITIES HAVE NOT BEEN  REGISTERED  UNDER
         THE U.S.  SECURITIES  ACT OF 1933,  AND  SUBJECT TO
         CERTAIN  EXCEPTIONS,  MAY NOT BE SOLD IN THE UNITED
         STATES  OR TO U.S.  PERSONS.  ANY  SALE,  TRANSFER,
         PLEDGE OR OTHER  DISPOSITION  THEREOF IN THE UNITED
         STATES OR TO U.S. PERSONS MAY BE MADE ONLY (i) IN A
         REGISTRATION UNDER SAID ACT OR (ii) IF AN EXEMPTION
         FROM  REGISTRATION  UNDER SAID ACT IS AVAILABLE AND
         THE COMPANY  HAS  RECEIVED AN OPINION OF COUNSEL TO
         THAT EFFECT REASONABLY SATISFACTORY TO IT."

         Each Purchaser consents to the Company making a notation on its records
and  giving  instructions  to any  transfer  agent  of the  Shares  in  order to
implement the  restrictions on transfer  established in this Agreement.  As used
hereinafter the term  "Restricted  Securities"  shall mean the securities of the
Company required to bear the legend set forth in this section.

             (c) Notice of Proposed  Transfers.  The holder of each  certificate
representing Restricted Securities by acceptance thereof agrees to comply in all
respects  with the  provisions  of this Section 4. Prior to any  proposed  sale,
assignment,  transfer or pledge of any Restricted Securities, unless there is in
effect a registration  statement  under the Securities Act covering the proposed
transfer,  the holder thereof shall give written notice to the issuer thereof of
such holder's  intention to effect such  transfer,  sale,  assignment or pledge.
Each such notice  shall  describe the manner and  circumstances  of the proposed
transfer,  sale,  assignment  or pledge in  sufficient  detail,  and  shall,  if
reasonably requested by the issuer, be accompanied,  at such holder's expense by
either (i)  written  opinion  of legal  counsel  who shall be,  and whose  legal
opinion  shall be,  reasonably  satisfactory  to the  Company  addressed  to the
Company,  to the effect that the proposed transfer of the Restricted  Securities
may be effected  without  registration  under the Securities  Act, or (ii) a "no
action" letter from the Securities and Exchange Commission (the "Commission") to
the effect that the transfer of such securities  without  registration  will not
result in a  recommendation  by the staff of the Commission that action be taken
with respect thereto,

                                       29
<PAGE>

whereupon the holder of such Restricted Securities shall be entitled to transfer
such Restricted  securities in accordance with the terms of the notice delivered
by the holder to the Company.

         6.  Covenants of the Company. The Company covenants and agrees with the
Purchaser to refrain from  engaging,  and to insure that none of its  affiliates
will engage,  in any Directed  Selling Efforts with respect to the Shares or any
distribution,  as  that  term is used in the  definition  of  Distributor,  with
respect to the shares.

         7.  Registration.

             (a) Certain  Definitions.  As used in this  Section,  the following
terms shall have the following respective meanings:

                 (i)  "Commission"   shall  mean  the  Securities  and  Exchange
Commission or any other federal agency at the time  administering the Securities
Act.

                 (ii)  "Holder"  shall mean any  Purchaser  holding  Registrable
Securities  and any person  holding  Registrable  Securities  to whom the rights
under this  Agreement  have been  transferred  in  compliance  with  Section 7.3
hereof.

                 (iii)  "Registrable  Securities"  means the  Shares;  provided,
however,  that shares of the Company's  Common Stock or other  securities  shall
only be treated as Registrable  Securities if and so long as (A) such securities
have not been sold to or through a broker or dealer or  underwriter  in a public
distribution or a public securities transaction,  or (B) all such securities may
be sold by the Holder  thereof under Rule 144  promulgated  under the Securities
Act, or a successor  rule,  within  such period as  Purchaser  may sell all such
securities.

                 (iv) The  terms  "register,"  "registered"  and  "registration"
refer  to a  registration  effected  by  preparing  and  filing  a  registration
statement in compliance with the Securities Act, and the declaration or ordering
of the effectiveness of such registration statement.

                 (v) "Registration Expenses" shall mean all expenses,  except as
otherwise  stated below,  incurred by the Company in complying with this Section
4, including,  without  limitation,  all registration,  qualification and filing
fees, printing expenses,  escrow fees, fees and disbursements of counsel for the
Company and all reasonable fees and disbursements of one counsel for the selling
Holders,  blue sky fees and  expenses  and the  expense  of any  special  audits
incident to or required by any such registration (but excluding the compensation
of regular  employees  of the  Company  which  shall be paid in any event by the
Company and Selling Expenses (as hereinafter defined)).

                 (vi) "Selling Expenses" shall mean all underwriting  discounts,
selling  commissions  and stock  transfer  taxes  applicable  to the  securities
registered by the Holders and, except as set forth above.

                 (vii)  "1934  Act" shall mean the  Securities  Exchange  Act of
1934, as amended.

                                       30
<PAGE>

             (b)  Registration  of Shares.  Within sixty (60) days following the
Closing  Date the  Company  will use its  diligent  best  efforts to effect such
registration  as soon as  practicable  as will permit or facilitate the sale and
distribution of the Shares.

             (c) Expenses of Registration. All Registration Expenses incurred in
connection  with a  registration  pursuant  to  Section  4 shall be borne by the
Company.  Unless otherwise  stated,  all Selling Expenses relating to securities
registered on behalf of the Holders and all other Registration Expenses shall be
borne by the Holders of such  securities  pro rata on the basis of the number of
shares so registered.

             (d)  Registration  Procedures.  In the  case of each  registration,
qualification or compliance  effected by the Company pursuant to this Agreement,
the Company  will keep each Holder  advised in writing as to the  initiation  of
each  registration,  qualification  and  compliance  and  as to  the  completion
thereof. At its expense the Company will:

                 (i)  Prepare  and  file  with  the  Commission  a  registration
statement with respect to such securities and use its best efforts to cause such
registration statement to become and remain effective for at least three hundred
sixty-five  (365) days or until the  distribution  described in the Registration
Statement has been completed;  provided,  however,  that (i) such 365-day period
shall be extended  for a period of time equal to the period the Holder  refrains
from selling any securities  included in such  registration at the request of an
underwriter of Common Stock (or other  securities)  of the Company;  and (ii) in
the case of any  registration  of  Registrable  Securities on Form S-3 which are
intended to be offered on a continuous  or delayed  basis,  such 365-day  period
shall be extended,  if necessary,  to keep the registration  statement effective
until all such Registrable  Securities are sold,  provided that Rule 415, or any
successor  rule under the Act,  permits an offering on a  continuous  or delayed
basis,  and provided  further that  applicable  rules under the  Securities  Act
governing the obligation to file a post-effective  amendment  permit, in lieu of
filing a post-effective  amendment which (I) includes any prospectus required by
Section  10(a)(3)  of the  Securities  Act or  (II)  reflects  facts  or  events
representing a material or fundamental  change in the  information  set forth in
the  registration  statement,  the  incorporation  by reference  of  information
required  to be  included  in (I) and (II)  above to be  contained  in  periodic
reports  filed  pursuant  to  Section  13 or  15(d)  of  the  1034  Act  in  the
registration statement.

                 (ii) Prepare and file with the Commission  such  amendments and
supplements to such registration statement and the prospectus used in connection
with  such  registration  statement  as may be  necessary  to  comply  with  the
provisions  of  the  Securities  Act  with  respect  to the  disposition  of all
securities covered by such registration statement.

                 (iii)  Use  its  best  efforts  to  register  and  qualify  the
securities covered by such registration  statement such other securities or Blue
sky laws of such jurisdictions as shall be reasonably  requested by the Holders;
provided that the Company shall not be required in connection  therewith or as a
condition  thereto  to qualify to do  business  or to file a general  consent to
service of process in any such  states or  jurisdictions,  unless the Company is
already  subject to service in such  jurisdiction  and except as may be required
under the Securities Act.

                                       31
<PAGE>

                 (iv) In the event of any underwritten  public  offering,  enter
into and perform its obligations under an underwriting  agreement,  in usual and
customary  form with the  managing  underwriter  or such  offering.  Each Holder
participating  in such  underwriting  shall  also  enter  into and  perform  its
obligations under such an agreement.

                 (v) Notify each  Holder of  Registrable  Securities  covered by
such  registration  statement at any time when a prospectus  relating thereto is
required to be delivered under the Act of the happening of any event as a result
of which the  prospectus  included in such  registration  statement,  as then in
effect,  includes  an untrue  statement  of a material  fact or omits to state a
material fact required to be stated  therein or necessary to make the statements
therein not misleading in the light of the circumstances then existing.

                 (vi) Cause all such Registrable  Securities registered pursuant
hereunder to be listed on each securities  exchange on which similar  securities
issued by the Company are then listed.

                 (vii)   Provide  a  transfer   agent  and   registrar  for  all
Registrable  Securities registered pursuant hereunder and a CUSIP number for all
such Registrable Securities registered, in each case not late than the effective
date of such registration.

                 (viii)   Furnish   to  the   Holders   participating   in  such
registration  and to the  underwriters of the securities  being  registered such
reasonable  number  of  copies  of  the  registration   statement,   preliminary
prospectus,  final prospectus and such other documents as such  underwriters may
reasonably   request  in  order  to  facilitate  the  public  offering  of  such
securities.

             (e) Indemnification.

                 (i)  The  Company  will  indemnify  each  Holder,  each  of its
officers and  directors and partners,  and each person  controlling  such Holder
within the  meaning of Section 15 of the  Securities  Act or the 1934 Act,  with
respect to which  registration,  qualification  or compliance  has been effected
pursuant to this Agreement,  and each  underwriter,  if any, and each person who
controls any underwriter  within the meaning of Section 15 of the Securities Act
or the 1934 Act, against all expenses,  claims,  losses,  damages or liabilities
(or actions in respect  thereof),  including  any of the  foregoing  incurred in
settlement of any litigation,  commenced or threatened,  arising out of or based
on any untrue  statement  (or  alleged  untrue  statement)  of a  material  fact
contained in any registration statement,  prospectus, offering circular or other
document,  or  any  amendment  or  supplement  thereto,  incident  to  any  such
registration,  qualification or compliance, or based on any omission (or alleged
omission)  to state  therein a material  fact  required to be stated  therein or
necessary to make the statements  therein,  in the light of the circumstances in
which they were made,  not  misleading,  or any  violation by the Company of the
Securities Act, or the 1934 Act, or any rule or regulation promulgated under the
Securities  Act, or the 1934 Act,  applicable to the Company in connection  with
any  such  registration,  qualification  or  compliance,  and the  Company  will
reimburse each such Holder, each of its officers and directors,  and each person
controlling such Holder,  each such underwriter and each person who controls any
such underwriter,  for any legal and any other expenses reasonably incurred,  as
such expenses are incurred, in connection with investigating, preparing

                                       32
<PAGE>

or  defending  any such claim,  loss,  damage,  liability  or action;  provided,
however,  that the Company will not be liable (i) for amounts paid in settlement
of any such loss,  claim,  damage,  liability  or action if such  settlement  is
effected  without  the  consent  of the  Company  (which  consent  shall  not be
unreasonably  withheld)  and (ii) in any such case to the  extent  that any such
claim,  loss,  damage,  liability  or  expense  arises out of or is based on any
untrue  statement or omission or alleged untrue  statement or omission,  made in
reliance  upon and in  conformity  with  written  information  furnished  to the
Company by an  instrument  duly executed by such Holder,  controlling  person or
underwriter and stated to be specifically for use therein.

                 (ii) Each Holder will, if Registrable  Securities  held by such
Holder  are  included  in  the   securities  as  to  which  such   registration,
qualification  or compliance is being effected,  indemnify the Company,  each of
its  directors  and  officers,  each  underwriter,  if  any,  of  the  Company's
securities  covered by such a registration  statement,  each person who controls
the  Company  or such  underwriter  within  the  meaning  of  Section  15 of the
Securities  Act, and each other such Holder,  each of its officers and directors
and each person  controlling such Holder within the meaning of Section 15 of the
Securities Act, against all claims,  losses, damages and liabilities (or actions
in respect  thereof) arising out of or based on any untrue statement (or alleged
untrue  statement)  of a  material  fact  contained  in  any  such  registration
statement,  prospectus, offering circular or other document, or any omission (or
alleged omission) to state therein a material fact required to be stated therein
or necessary to make the statements  therein not misleading,  and will reimburse
the Company, such Holders, such directors,  officers,  persons,  underwriters or
control  persons  for any legal or any other  expenses  reasonably  incurred  in
connection  with  investigating  or  defending  any such  claim,  loss,  damage,
liability or action,  in each case to the extent,  but only to the extent,  that
such untrue  statement  (or alleged  untrue  statement)  or omission (or alleged
omission) is made in such registration statement,  prospectus, offering circular
or other  document in reliance upon and in conformity  with written  information
furnished  to the  Company by an  instrument  duly  executed  by such Holder and
stated to be specifically for use therein.  Notwithstanding  the foregoing,  the
liability  of each  Holder  under  this  subsection  (b) (i)  shall not apply to
amounts paid in settlement of any such loss, claim, damage,  liability or action
if such settlement is effected  without the consent of the Holder (which consent
shall not be  unreasonably  withheld),  and (ii)  shall be  limited in an amount
equal to the aggregate  initial public offering price of the shares sold by such
Holder,  unless such liability  arises out of or is based on willful  conduct by
such Holder.  The obligations of the Company and Holders under this Section 7(e)
shall  survive the  completion  of any offering of  Registrable  Securities in a
registration statement under this Section 7(e) and otherwise.

             (f)  Information  by Holder.  The Holder or Holders of  Registrable
Securities  included  in any  registration  shall  furnish to the  Company  such
information regarding such Holder or Holders, the Registrable Securities held by
them and the distribution  proposed by such Holder or Holders as the Company may
request in writing and as shall be required in connection with any registration,
qualification or compliance referred to in this Agreement.

             (g)  Transfer  of  Registration  Rights.  The  rights  to cause the
Company to register  securities  granted Holders under Section 7 may be assigned
to a transferee or assignee  reasonably  acceptable to the Company in connection
with any transfer or assignment of Registrable  Securities by a Holder  provided
that: (i) such transfer may otherwise be effected in

                                       33
<PAGE>

accordance  with  applicable  securities  laws, (ii) such assignee or transferee
acquires at least 100,000 shares of Common Stock (as appropriately adjusted upon
any stock split,  stock dividend,  recapitalization,  merger,  consolidation  or
similar  event) or is a subsidiary  or  constituent  partner or affiliate of the
transferor  and  (iii)  such  assignee  or  transferee  becomes  a party to this
Agreement  and  assumes  all  of the  obligations  of  the  transferring  Holder
hereunder.


         8.  Survival of the Representations,  Warranties,  etc. The  respective
agreements, representations,  warranties, indemnities, and other statements made
by or on behalf of the Company  and the  Purchasers,  respectively,  pursuant to
this  Agreement,  shall  remain in full  force  and  effect,  regardless  of any
investigation  made by or on behalf of the other party to this  Agreement or any
officer, director, or employee of, or person controlling or under common control
with, such party, and will survive delivery of any payment of the Shares.

         9.  Notices. All communications  hereunder shall be in writing, and, if
sent to the Purchaser shall be sufficient in all respects if delivered,  sent by
registered  mail, or by telecopy and confirmed to the Purchaser at the addresses
set forth on the Signature Page; or, if sent to the Company, shall be delivered,
sent by registered mail, or by telecopy and confirmed to the Company at:

                             Imatron Inc.
                             389 Oyster Point Boulevard
                             South San Francisco, California 94080
                                     Attention: President

                             Tel: (415) 583-9964
                             Fax: (415) 871-0418

         10. Miscellaneous.

             (a) This Agreement may be executed in one or more  counterparts and
it  is  not  necessary  that  signature  of  all  parties  appear  on  the  same
counterpart,  but such  counterparts  together shall  constitute but one and the
same agreement.

             (b) This  Agreement  shall  inure to the  benefit of and be binding
upon the parties  hereto,  their  respective  successors  and,  with  respect to
Section 7 hereof, the officers,  directors,  and controlling persons thereof and
each person under common control  therewith,  and no other person shall have any
right or obligation hereunder.

             (c)  This  Agreement   shall  be  governed  by,  and  construed  in
accordance with, the laws of the State of California.

             (d) The  headings  of the  sections  of  this  document  have  been
inserted for  convenience of reference only and shall not be deemed to be a part
of this Agreement.


                                       34
<PAGE>

         IN WITNESS HEREOF,  the parties hereto have duly executed and delivered
this Agreement, all as of the day and year first above written.

                                    COMPANY:

                                            IMATRON INC.

                                            By:________________________
                                                     President


                                       35
<PAGE>

         CONTINUATION SIGNATURE PAGE TO COMMON STOCK PURCHASE AGREEMENT
                               DATED MAY 24, 1996
                   BETWEEN IMATRON INC. AND CERTAIN PURCHASERS

                                   PURCHASER:


Purchaser's Name                     Number of Shares
and Address                          and Purchase Price          Signature
- ----------------                     ------------------          ---------

Jose Maria Salema Garcao             700,000 shares
Quinta Marinha Lt. CT 14             $1,820,000              ------------------
2750 Cascais, Portugal

Luis Jorge Serras                    600,000 shares
R. Augusta no. 228 - 1o              $1,560,000              ------------------
1100 Lisboa, Portugal

Jose Laranjeiro Osvaldo Gomes        500,000 shares
Ave. Cesario Verde, 46               $1,300,000              ------------------
2758 Cascais, Portugal

Armando Jose Rinaldi Balbi           400,000 shares
Rua General Urquiza No. 110          $1,040,000              ------------------
Ap. 201 Leblon
Rio De Janeiro, Brazil


Eduardo Guedes Q. de Mendia          200,000 shares
Trava da Arrochela no. 3             $520,000                ------------------
1200 Lisboa, Portugal

Carlos Spynola Teixeira              200,000 shares
Rua Gregorio Lopes, no 1514          $520,000                ------------------
9o Esqo
1400 Lisboa, Portugal

Dr. Jose Diogo Ferreira Martins      100,000 shares
Rua Tierno Galvan Lote 5B-11o C      $260,000                ------------------
1070 Lisboa, Portugal

Maria Madalena Bello Pimentel        100,000 shares
R. D. Joao V                         $260,000                ------------------
12-2o Esqo
1250 Lisboa, Portugal

Jose Antonio Reymao Nogueira         100,000 shares
Ave Alvares Cabral no 28 - 4o Dto    $260,000                ------------------
1250 Lisboa, Portugal


Jose Filipe Nobre Guedes             100,000 shares
Rua Martin Sainz no 7                $260,000                ------------------
2765 Estoril, Portugal

                                       36
<PAGE>


                SIGNATURE PAGE TO COMMON STOCK PURCHASE AGREEMENT
                               DATED MAY 24, 1996
                   BETWEEN IMATRON INC. AND CERTAIN PURCHASERS

                                   PURCHASER:

                                     Number of Shares and
Purchaser's Name and Address         Purchase Price            Signature
- ----------------------------         --------------------      ---------

Banco Espirito Santo Internacional   1,000,000 shares
Avenue Montchoisi No. 15             $2,600,000
1006 Lausanne, Switzerland
                                                           ---------------------
                                                            Authorized Officer



                                       37






                                   Exhibit 4.4




                                       38

<PAGE>

THESE  SECURITIES  HAVE  NOT BEEN AND  WILL  NOT BE  REGISTERED  UNDER  THE U.S.
SECURITIES  ACT OF 1933, AND SUBJECT TO CERTAIN  EXCEPTIONS,  MAY NOT BE SOLD IN
THE  UNITED  STATES  OR TO U.S.  PERSONS.  ANY SALE,  TRANSFER,  PLEDGE OR OTHER
DISPOSITION THEREOF IN THE UNITED STATES OR TO U.S. PERSONS MAY BE MADE ONLY (I)
IN A REGISTRATION UNDER SAID ACT OR (II) IF AN EXEMPTION FROM REGISTRATION UNDER
SAID ACT IS AVAILABLE AND THE COMPANY HAS RECEIVED AN OPINION OF COUNSEL TO THAT
EFFECT REASONABLY SATISFACTORY TO IT. ANY PERSON EXERCISING THIS WARRANT WILL BE
REQUIRED TO PROVIDE EITHER (I) A CERTIFICATION  THAT THE WARRANT IS NOT OWNED BY
OR BEING  EXERCISED  BY A U.S.  PERSON OR (II) AN OPINION OF COUNSEL  REASONABLY
SATISFACTORY  TO IT THAT THE SHARES OF COMMON STOCK  ISSUABLE  UPON  EXERCISE OF
THIS  WARRANT  HAVE  BEEN  REGISTERED  UNDER  SAID  ACT  OR  AN  EXEMPTION  FROM
REGISTRATION IS UNDER SAID ACT IS AVAILABLE.


                                  IMATRON INC.

                          COMMON STOCK PURCHASE WARRANT

                        This Warrant Expires May 24, 1999


Warrant No. 96-A                                               Shares: 2,000,000

         THIS CERTIFIES  that,  subject to the terms and  conditions  herein set
forth,  JOSE MARIA SALEMA  GARCAO (the  "Holder")  is entitled to purchase  from
Imatron Inc., a New Jersey corporation (the "Company"), at any time or from time
to time during the Exercise Period (as hereinafter defined) the number of shares
of fully paid and  non-assessable  shares of Common  Stock of the  Company  (the
"Shares") as provided  herein upon surrender  hereof at the principal  office of
the  Company,  and, at the  election of the holder  hereof,  upon payment of the
purchase  price  at said  office  in cash or by  cashier's  check or by the wire
transfer of funds in a dollar  amount equal to the purchase  price of the Shares
for which the consideration is being given.

         This  Warrant  shall be  exercisable  for that  number of Shares as set
forth above, in minimum units of 100,000 shares.

         1. Purchase Price. Subject to adjustment as hereinafter  provided,  the
purchase  price of one  share of  Common  Stock  (or such  securities  as may be
substituted for one share of Common Stock pursuant to the provisions hereinafter
set forth) (the "Warrant Price") shall be the following:

                         1,200,000 shares                   $3.25
                           800,000 shares                   $3.75


                                       39
<PAGE>

         2.  Adjustment  of Warrant  Price and Number of Shares.  The number and
kind of  securities  issuable upon the exercise of this Warrant shall be subject
to adjustment from time to time upon the happening of certain events as follows:

             (a) Adjustment for Dividends in Stock.  In case at any time or from
time to time on or after the date hereof the holders of the Common  Stock of the
Company (or any shares of stock or other  securities at the time receivable upon
the exercise of this Warrant)  shall have  received,  or, on or after the record
date fixed for the  determination  of eligible  stockholders,  shall have become
entitled to receive,  without payment therefor, other or additional stock of the
Company by way of dividend (other than as provided for in Paragraph 2(b) below),
then and in each such case, the holder of this Warrant shall,  upon the exercise
hereof,  be entitled  to receive,  in addition to the number of shares of Common
Stock receivable thereupon,  and without payment of any additional consideration
therefor, the amount of such other or additional stock of the Company which such
holder would hold on the date of such  exercise had it been the holder of record
of such Common  Stock on the date hereof and had  thereafter,  during the period
from the date hereof to and including the date of such  exercise,  retained such
shares called for during such period by this Paragraph 2.

             (b) Adjustment for Changes in Common Stock. In the event of changes
in the  outstanding  Common  Stock  of  the  Company  by  reason  of  split-ups,
recapitalizations,  reclassifications,  mergers, consolidations, combinations or
exchanges of shares, separations,  reorganizations,  liquidations,  or the like,
the number and class of shares  available under the Warrant in the aggregate and
the Warrant Price shall be correspondingly adjusted by the Board of Directors of
the Company. The adjustment shall be such as will give the holder of the Warrant
on exercise for the same aggregate  Warrant Price the total number,  class,  and
kind of shares as he would have owned had the Warrant  been  exercised  prior to
the  event  and had he  continued  to hold  such  shares  until  after the event
requiring adjustment.

         3.  No Fractional  Shares. No fractional shares of Common Stock will be
issued in connection with any subscription  hereunder. In lieu of any fractional
shares which would  otherwise be issuable,  the Company  shall pay cash equal to
the product of such fraction multiplied by the fair market value of one share of
Common Stock on the date of exercise,  as determined by the fair market value of
one share of the Company's Common Stock on the date of exercise as determined in
good faith by the Company's Board of Directors.

         4.  No Stockholder Rights. This Warrant shall not entitle its holder to
any of the rights of a stockholder of the Company prior to exercise thereof.

         5.  Reservation of Stock. The Company  covenants that during the period
this Warrant is  exercisable,  the Company will reserve from its  authorized and
unissued Common Stock a sufficient  number of shares to provide for the issuance
of Common Stock upon the exercise of this Warrant.  The Company  agrees that its
issuance of this Warrant shall constitute full authority to its officers who are
charged with the duty of executing stock certificates to


                                       40

<PAGE>

execute and issue the necessary certificates for shares of Common Stock upon the
exercise of this Warrant.

         6. Exercise of Warrant. This Warrant may be exercised by the registered
holder or its  registered  assigns,  in whole or in part and in minimum units of
10,000 shares,  by the surrender of this Warrant at the principal  office of the
Company,   together  with  the  form  of  subscription   hereof  duly  executed,
accompanied  by payment in full of the amount of the  Warrant  Price in the form
described  in this  Warrant.  Upon  partial  exercise  hereof,  a new warrant or
warrants containing the same date and provisions as this Warrant shall be issued
by the Company to the registered holder for the number of shares of Common Stock
with  respect to which this  Warrant  shall not have been  exercised.  A Warrant
shall be  deemed  to have  been  exercised  immediately  prior  to the  close of
business on the date of its  surrender for exercise as provided  above,  and the
person  entitled  to  receive  the  shares of Common  Stock  issuable  upon such
exercise  shall be treated  for all  purposes  as the  holder of such  shares of
record as of the close of business on such date. As promptly as  practicable  on
or after such date, the Company shall issue and deliver to the person or persons
entitled to receive the same, a certificate  or  certificates  for the number of
full shares of Common Stock issuable upon such  exercise,  together with cash in
lieu of any fraction of a share as provided above.

         7. Certificate of Adjustment. Whenever the Warrant Price is adjusted as
herein provided, the Company shall promptly deliver to the record holder of this
Warrant a  certificate  of an officer of the Company  setting forth the relevant
Warrant  Price or number of shares  after such  adjustment  and setting  forth a
brief statement of the facts requiring such adjustment.

         8.  Compliance  With  Securities  Act. The holder of this  Warrant,  by
acceptance hereof, agrees that this Warrant and the shares of Common Stock to be
issued upon  exercise  hereof (or shares of any security  into which such Common
Stock may be converted)  are being  acquired for  investment and that the holder
will not offer,  sell,  or  otherwise  dispose of this Warrant and any shares of
Common Stock to be issued upon  exercise  hereof (or shares of any security into
which such Common Stock may be converted) except under  circumstances which will
not  result in a  violation  of the  Securities  Act of 1933,  as  amended  (the
"Securities  Act").  Upon exercise of this Warrant,  the holder hereof shall, if
requested  by the  Company,  confirm  in  writing  its  investment  purpose  and
acceptance of the restrictions on transfer of the shares of Common Stock.

         9. Subdivision of Warrant. At the request of the holder of this Warrant
in  connection  with a transfer or exercise  of a portion of the  Warrant,  upon
surrender of such  Warrant for such  purpose to the Company,  the Company at its
expense  (except for any transfer tax payable) will issue and exchange  therefor
warrants  of like  tenor and date  representing  in the  aggregate  the right to
purchase  such number of shares of such Common Stock as shall be  designated  by
such holder at the time of such surrender; provided, however, that the Company's
obligations to subdivide  securities  under this section shall be subject to and
conditioned  upon the compliance of any such  subdivision  with applicable state
securities laws and with the Securities Act.

                                       41

<PAGE>

         10. Loss, Theft, Destruction, or Mutilation of Warrant. Upon receipt by
the  Company  of  evidence  reasonably  satisfactory  to it of the loss,  theft,
destruction,  or  mutilation  of this Warrant,  and in case of loss,  theft,  or
destruction,  of indemnity or security  reasonably  satisfactory to it, and upon
reimbursement to the Company of all reasonable expenses incidental thereto,  and
upon surrender and cancellation of this Warrant, if mutilated,  the Company will
make and deliver a new Warrant of like tenor and dates as of such  cancellation,
in lieu of this Warrant.

         11.  Miscellaneous.  This Warrant  shall be governed by the laws of the
State  of  California.  The  headings  in  this  Warrant  are  for  purposes  of
convenience  and  reference  only,  and shall not be deemed to constitute a part
hereof.  Neither  this  Warrant  nor any term  hereof  may be  changed,  waived,
discharged,  or terminated orally but only by an instrument in writing signed by
the  Company  and  the  registered   holder   hereof.   All  notices  and  other
communications  from the  Company  to the  holder  of this  Warrant  shall be by
telecopy or expedited courier service to the address furnished to the Company in
writing by the last holder of this  Warrant who shall have  furnished an address
to the Company in writing.

         12.  Exercise  Period.  The  Exercise  Period  shall  mean  the  period
commencing on the date hereof and ending on May 24, 1999.


         ISSUED this 24th day of May, 1996.

                                       IMATRON INC.                
                                     
                                     
                                       By_________________________
                                        S. Lewis Meyer, President

ATTEST:                              
                         

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





                                       42

<PAGE>

                               FORM OF ASSIGNMENT
                                  IMATRON INC.


         FOR VALUE  RECEIVED the  undersigned  registered  owner of this warrant
hereby sells,  assigns,  and transfers  unto the Assignee named below all of the
rights of the undersigned  under the within Warrant,  with respect to the number
of shares of Common Stock set forth below.  

Name of Assignee                  Address           Number of Shares
- ----------------                  -------           ----------------

and does hereby irrevocably constitute and appoint _____________________________
Attorney to make such transfer on the books of IMATRON  INC.  maintained for the
purpose, with full power of substitution in the premises.


Dated:______________________

                                         ----------------------------------
                                         Name of Warrant Holder

                                         Signature:  ______________________


Witness:            ______________________


                                       43

<PAGE>





                                SUBSCRIPTION FORM
                                  IMATRON INC.

                 (To be executed only upon exercise of Warrant)

         The undersigned  registered owner of this Warrant irrevocably exercises
this  Warrant  for and  purchases  ________________  of the  number of shares of
Common Stock of IMATRON INC.  purchasable with this Warrant,  and herewith makes
payment therefor,  all at the price and on the terms and conditions specified in
this Warrant.

Dated:_____________________

                                           --------------------------------
                                           (Signature of Registered Owner)

                                           --------------------------------
                                                     (Street Address)

                                           --------------------------------
                                           (City)   (State)    (Zip Code)


                                       44





                                   Exhibit 5.1



                                       45

<PAGE>

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

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


                                  June 21, 1996



Imatron Inc.
389 Oyster Point Boulevard
South San Francisco, California 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  on behalf of certain  Selling  Shareholders  covering  the
offering of up to 6,283,700 shares of the Company's Common Stock (the "Shares"),
including  2,283,700  shares  which are  issuable  upon the exercise of Warrants
previously issued in certain private transactions.

         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  where 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.

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


                                       46

<PAGE>

         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/kw

                                       47






                                  Exhibit 24.1



                                       48

<PAGE>


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS



         We consent to the reference to our firm under the caption  "Experts" in
the Registration Statement (Form S-3) and related Prospectus of Imatron Inc. for
the   registration  of  6,283,700   shares  of  its  common  stock  and  to  the
incorporation  by reference  therein of our report  dated  February 9, 1996 with
respect to the consolidated financial statements of Imatron Inc. included in its
Annual Report (Form 10-K) for the year ended  December 31, 1995,  filed with the
Securities and Exchange Commission.


                                                              Ernst & Young LLP



June 24, 1996


                                       49



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