IMATRON INC
S-3, 1996-05-10
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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As filed with the Securities and Exchange Commission on May 10, 1996
                    --Registration No. 33-__________


                                    FORM S-3

                       SECURITIES AND EXCHANGE COMMISSION

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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

                New Jersey                         94-2880078
          (State of incorporation)     (I.R.S. Employer Identification No.)
                            --------------------

                           389 Oyster Point Boulevard
                      South San Francisco, 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 )
<TABLE>

                         CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------
<CAPTION>

Title of Each Class     Amount to Be        Proposed Maximum         Proposed Maximum         Amount of
of Securities to Be     Registered          Offering Price Per       Aggregate Offering      Registration Fee
Registered                                      Share                    Price                   
                                                                                                   

<S>                       <C>                <C>                      <C>                        <C>   
Common Stock              2,645,144          $3.77 (1)                $9,972,193 (1)             $3,439
                          Shares                                           
- ------------------------------------------------------------------------------
<FN>

     (1) Estimated  pursuant to Rule 457(c)  solely for purposes of  determining
         the  registration  fee, based on the average of the high and low sales
         prices on April 30, 1996, as reported on the NASDAQ National Market 
         System.
</FN>
</TABLE>


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


<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 MAY 10, 1996

                                   PROSPECTUS

                                2,645,144 Shares

                                  IMATRON INC.

                            Common Stock No Par Value

         This Prospectus relates to the sale of up to 2,645,144 shares of Common
Stock,  no par value,  of Imatron Inc. (the  "Company") by  shareholders  of the
Company (the  "Selling  Shareholders").  A total of 73,448  shares are currently
issued and outstanding (the "Outstanding  Shares");  a total of 2,571,696 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 May 10, 1996


<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........................................................ 15

EXPERTS..................................................................... 15

LEGAL OPINION............................................................... 15

<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  held on June
28, 1996,  filed April 29, 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.
<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 May, 1996. HeartScan's centers deliver the
CAS diagnostic test together with other risk factor tests in a manner consistent
with established channels of patient referral,  as well as with the new channels
of  patient  referral  being  created  by health  care  reform and the growth of
managed-care systems.

        A  significant  component of  HeartScan's  approach is to offer the CAS
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,
<PAGE>

increases  the  demand  for  Imatron's   C-150/Evolution  scanner  currently  in
distribution.  HeartScan management believes that the market for coronary artery
disease risk assessment centers is very large and that HeartScan's comprehensive
heart disease screening approach is both revolutionary and highly effective.

     HeartScan  Imaging,  Inc. was incorporated in Delaware in 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
<PAGE>

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

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

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

         Limited  Clinical  Demonstration  of Certain  Advantages  of  Company's
Scanner.  The  Company's  scanners have been used in a clinical  environment  on
humans since April,  1983.  Clinical use of 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.
<PAGE>

         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 June
<PAGE>

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.
<PAGE>

The license 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 and 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.
<PAGE>

         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   currently   requiring
<PAGE>

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.
<PAGE>

         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
<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.
<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.
<PAGE>

         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.
<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.
<PAGE>

                                 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:
<TABLE>


<CAPTION>

Name of Selling              Shares                   Shares Available           Percent Owned 
Securityholder               Beneficially             for Sale Under this        After Completion
(1)                          Owned (2)                Prospectus                 of the Offering(3)
                            
<S>                          <C>                      <C>                         <C>  
Arbinter-Omnivalor S.A.      109,091                  109,091                     *

Bank Ehinger & Cie AG        60,000                   60,000                      *

Banque Franck S.A.           120,000                  120,000                     *
<PAGE>


Banque Genevoise             38,182                   38,182                      *
de Gestion  

Banque Privee                45,455                   10,909                      *
Edmond de 
Rothschild S.A.

Banque Scandinave            109,091                  109,091                     *
en Suisse 

Codell Holdings,             30,303                    30,303                     *
Ltd.

Donaghy Inc.                 65,000                    65,000                     *

Experta Trustee Ltd.         99,394                    99,394                     *

FI.M.A.I.                  1,000,000                  1,000,000                   *
Holding, S.A.

Heritage Finance            70,364                     40,364                     *
 & Trust Company  

Intercapital Limited        109,091                    109,091                     *

Jose Osvaldo Gomez (4)      327,273                     65,455                     *

Jose Maria                 1,000,000                  185,455                   1.16
Salema Garcao(5)

Montrachet Norstar           12,121                    12,121                     *
Investments, Ltd.

The Shemano Group            50,000                     50,000                     *
, Inc.

Sitrick and                 140,688                    140,688                     *
Company Inc. 
<PAGE>

S. Lewis Meyer             1,037,440                   400,000                     *

All Selling                4,423,493                 2,645,144                   2.54
Shareholders as a Group

<FN>

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

(1)      FI.M.A.I.  Holding,  S.A.  ("FI.M.A.I.") has had the following material
         relationships with the Company during the past three years: (i) Dr. Ugo
         Busatti  and Dr.  Giovanni  Lanzara  have  been the  persons  chosen by
         FI.M.A.I. to be its representatives on the Company's Board of Directors
         pursuant to a Series A Stock  Purchase  Agreement  dated July 20, 1988.
         Dr. Busatti  resigned his directorship on March 7, 1996; (ii) FI.M.A.I.
         and  the  Company   established  a  joint  venture  company,   InVision
         Technologies,  Inc.  ("InVision")  in 1990 to develop  and  manufacture
         advanced CT  technology  in the  baggage,  parcel and freight  scanning
         market. FI.M.A.I., the Company and InVision are parties to a Technology
         License Agreement wherein the Company has granted InVision an exclusive
         license to use the  Company's  technology  and  patents for the freight
         scanning  market.  In 1992 the Company sold a  substantial  part of its
         interest in InVision, and as of December 14, 1995 owns approximately 1%
         of InVision.  The Shareholders'  Agreement  between  FI.M.A.I.  and the
         Company related to InVision was  substantially  terminated by agreement
         on December 9, 1992.  Certain of the  provisions  of the  Shareholders'
         Agreement  remain  in  effect;  (iii)  Pursuant  to a Letter  of Credit
         Reimbursement Agreement entered into in February 1992 between FI.M.A.I.
         and the Company, FI.M.A.I. has provided an irrevocable Letter of Credit
         of up to $2,000,000 in favor of Instituto  Bancario San Paolo di Torino
         ("Instituto  Bancario")  to enable the  Company to obtain a  $2,000,000
         working capital line of credit from Instituto  Bancario.  The FI.M.A.I.
         guaranty in favor of Instituto Bancario  terminated in April 1996; (iv)
         FI.M.A.I. was formerly a major shareholder of the Company, and reported
         beneficial  ownership of the  following  capital stock in the Company's
         1995 Proxy Statement:  3,950,000  shares of Common Stock  (representing
         approximately  5.7% of the  class)  and  250,000  shares  of  Series  A
         Preferred Stock (representing approximately 22.6% of the class). All of
         the foregoing shares, except for the Shares, have been sold.

         Mr. S. Lewis  Meyer is  President  and Chief  Executive  Officer of the
         Company and a Director.  In connection with such employment the Company
         entered into an  Executive  Employment  Agreement  with Mr. Meyer which
         provided  for an initial term ending  December 31, 1993 and  continuing
         after  such  date  for  rolling  six  month  periods.  Pursuant  to the
         agreement,  Mr.  Meyer  is  entitled  to  a  base  salary  of  $185,000
         (subsequently increased to $195,000) per year subject to annual review,
         a  non-qualified  stock  option  to  purchase  600,000  shares  of  the
         Company's  Common Stock at $0.58 per share (85% of the price of a share
         of the  Company's  Common  Stock  on the date of  grant)  (subsequently
         repriced to $0.56), to be vested over a four-year  period,  the Warrant
         whose underlying shares of Common Stock are being offered hereby,  such
         Warrant  having  an  original  exercise  price of  $1.50  (subsequently
         repriced to $0.75 per share)  exercisable for six years commencing June
         14, 1994,  and certain  other  benefits.  Mr. Meyer  beneficially  owns
         1,037,440  shares of the Company's Common Stock including 37,440 shares
         owned directly and beneficially,  600,000 shares issuable upon exercise
         of the  non-qualified  stock option  described  above (of which 412,500
         shares are vested),  and 400,000  shares  issuable upon exercise of the
         Warrant.

(2)      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. See footnote
         (3) below.

(3)      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  70,026,336  shares of
         Common Stock issued and outstanding as of May 1, 1996.
<PAGE>

(4)      Maria Helena Gomez shares power to dispose of the Shares held by Jose
         Osvaldo Gomez.

(5)      Maria Luisa Garcao shares power to dispose of the Shares held by Jose 
         Maria Salema Garcao.
</FN>
</TABLE>

                              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.


<PAGE>


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



                                2,645,144 Shares

                                  IMATRON INC.

                              No Par Common Stock

                                   PROSPECTUS

                                  May 10, 1996

                                                             


<PAGE>


                 PART II. INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.   Other Expenses of Issuance and Distribution.

         The following  table sets forth all expenses  payable by the Company in
connection  with  the  issuance  and  distribution  of the  Common  Stock  being
registered.1  All the amounts  shown are estimates  except for the  registration
fee.

Registration fee.........................................................$3,439

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

Legal fees and expenses 2..............................................   5,000

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

 Total..................................................................$12,439

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

     2  Including legal expenses associated with Blue Sky filings.


<PAGE>

or  officership,  is  involved  in any  action or suit by or in the right of the
Company may be indemnified by the Company against expenses (including attorneys'
fees) actually and reasonably  incurred by him in connection with the defense or
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 April 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.
<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             Common  Stock  Purchase  Warrant  dated  November  6, 1990  
                between the Company and FI.M.A.I. Holding, S.A.11

4.2             Common Stock  Purchase  Warrant dated June 25, 1993 between the
                Company and S. Lewis Meyer.12

4.3             Registration  Rights  Agreement  between  the  Company  and  
                FI.M.A.I. Holding, S.A., dated November 6, 1990.13

4.4             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.

4.5             Form of Registration Rights Agreement between the Company and 
                investors in the Private Offering which concluded October 15, 
                1995.

4.6             Common Stock Purchase  Warrant dated April 15, 1996 between the 
                Company and Donaghy Inc.

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  Annual Report on Form 10-K for
        the fiscal year ended December 31, 1990 and incorporated herein by 
        reference.

    12  Filed as an Exhibit to the  Company's  Annual Report on Form 10-K for
        the fiscal year ended December 31, 1990 and incorporated herein by 
        reference.

    13  Filed as an Exhibit to the  Company's  Annual Report on Form 10-K for 
        the fiscal year ended December 31, 1990 and incorporated herein by 
        reference.
<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.
<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.


<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
May 10, 1996.

                                  IMATRON INC.


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


<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 Executive Officer      May 10, 1996
- --------------        and Director
S. Lewis Meyer                            

DOUGLAS P. BOYD       Chairman of the Board                   May 10, 1996
- ---------------
Douglas P. Boyd

GARY H. BROOKS        Vice President Finance, Chief           May 10, 1996
- --------------        Financial Officer,and Chief
Gary H. Brooks        Accounting Officer                    
                                           

JOHN L. COUCH         Director                                May 10, 1996
- -------------
John L. Couch

GIOVANNI LANZARA      Director                                May 10, 1996
- ----------------
Giovanni Lanzara

TERRY ROSS            Director                                May 10, 1996
- -----------
Terry Ross
                                                             
ALDO TEST             Director                                May 10, 1996
- ----------
Aldo Test



<PAGE>


                                  IMATRON INC.

                          INDEX TO EXHIBITS FILED WITH
                         FORM S-3 REGISTRATION STATEMENT

                        2,645,144 Shares of Common Stock


Sequential
Exhibit No.       Description                                          Page No.

4.4               Form of Common Stock Purchase Warrant which             26
                  expires December 31, 2000, issued to investors
                  in connection with the Private Offering which 
                  concluded October 19, 1995.

4.5               Form of Registration Rights Agreement between           33
                  the Company and investors in the Private
                  Offering which concluded October 19, 1995.

4.6               Common Stock Purchase Warrant dated April 15,           41
                  1996 between the Company and Donaghy, Inc.

5.1               Opinion of Counsel as to legality of securities         46
                  being registered.     

24.1              Consent of independent auditors.                        49

24.2              Consent of counsel.

                  Reference is made to Exhibit 5.1.

25.1              Power of Attorney (contained in signature pages)



<PAGE>


                                   Exhibit 4.4


<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 December 31, 2000


Warrant No. 95-__                                          Shares:____________

     THIS CERTIFIES that,  subject to the terms and conditions herein set forth,
_______________(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 10,000 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 Two Dollars  and  Fifty-two  Cents
($2.52), subject to adjustment as follows. The Warrant Price shall be subject to
adjustment in accordance with the following  formula:  On December 19, 1995, the
Warrant Price shall be adjusted to equal 140% of the 60-day Average  Price.  For
purposes of this section,  the 60-day Average Price shall be the average closing
price  (rounded to the nearest cent) of a share of the  Company's  Common Stock,
weighted by volume,  as reported in The Wall Street Journal on each trading date
<PAGE>

on which such shares are traded  during the period  October 20, 1995 through and
including December 18, 1995; provided however,  that the Warrant Price shall not
be greater than $2.52 nor less than $1.82 per share.

     2.  Adjustment  of Warrant  Price and Number of Shares.  In addition to the
adjustment  provided for in Section 1 above,  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 and/or all other  additional stock receivable by
it as aforesaid during such period,  given effect to all adjustments  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
<PAGE>

issuance of this Warrant shall constitute full authority to its officers who are
charged with the duty of executing  stock  certificates to 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 "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 Act.

     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 December 31, 2000.


         ISSUED this ____th day of October, 1995.

                                   IMATRON INC.


                                   By:______________________________________
                                            S. Lewis Meyer, President
ATTEST:


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


<PAGE>


                              IMATRON INC. FORM S-3

                       Schedule to Exhibit 4.4 Pursuant to
                             Instruction Number 2 to
                           Item 601 of Regulation S-K

         The Form of Common Stock Purchase  Warrant filed as Exhibit 4.4 to this
Registration  Statement is substantially  identical in all material  respects to
each of the Warrants issued to investors in connection with the Private Offering
by Imatron Inc. which concluded  October 19, 1995. This Schedule relates to each
Warrant whose underlying  Common Stock is being registered by this  Registration
Statement.  The Schedule  sets forth the material  details of all such  Warrants
which differ from the Exhibit filed herewith.

                                                        Number of Common Shares
Name of Warrant Holder          Warrant Number          Exercisable

Arbinter-Omnivalor S.A.         95-1                    100,000
                                95-1X                     9,091

Banque Franck S.A.              95-2                    110,000
                                95-2X                    10,000

Banque Genevoise De Gestion     95-3                     35,000
                                95-3X                     3,182

Banque Privee Edmond            95-4                     10,000
De Rothschild S.A.              95-4X                       909

Banque Scandinave en Suisse     95-5                    100,000
                                95-5X                     9,091

Codell Holdings, Ltd.           95-21                    27,778
                                95-21X                    2,525

Experta Trustee Ltd.            95-18                    80,000
                                95-18X                    7,273
                                95-19                    11,111
                                95-19X                    1,010

Heritage Finance & Trust        95-10                    37,000
                                95-10X                    3,364

International Industrial        95-11                   100,000
Bank (assigned to               95-11X                    9,091
Intercapital Limited)
<PAGE>

Bank Ehinger & Cie AG           95-14                    60,000

Jose Maria Salema Garcao        95-15                   110,000
                                95-15X                   10,000

Jose Maria Salema Garcao        95-16                    60,000
                                95-16                     5,455

Jose Osvaldo Gomez              95-17                    60,000
                                95-17X                    5,455

Montrachet Norstar              95-20                    11,111
Investments, Ltd.               95-20X                    1,010


<PAGE>


                                   Exhibit 4.5


<PAGE>



                          REGISTRATION RIGHTS AGREEMENT


         THIS REGISTRATION  RIGHTS AGREEMENT is made as of the date set forth on
the signature page attached hereto (the "Signature  Page") between IMATRON INC.,
a New Jersey  corporation  (the  "Company"),  and the  purchaser  whose name and
authorized signature appear on the Signature Page (the "Purchaser"):

                                RECITALS:

         WHEREAS,  the  Purchaser  has  purchased  that  number of shares of the
Company's  Common Stock,  as set forth on the  Signature  Page in an offering of
Units  consisting of five shares of the Company's  Common Stock and a warrant to
purchase one share of the Company's Common Stock.

         WHEREAS,  the  Company  desires  to grant  registration  rights  to the
Purchaser as set forth in this Agreement.

         NOW,  THEREFORE,  in consideration of the mutual promises and covenants
herein contained, the Company and the Purchaser agree as follows:

         1.       Definitions

                  "Commission" shall mean the Securities and Exchange Commission
or any other federal agency at the time administering the Securities Act of 1933
(the "Securities Act").

                  "Register,"   "registered,"  and  "registration"  refer  to  a
registration  effected  by  preparing  and filing a  registration  statement  in
compliance  with the Securities Act of 1933, and the  declaration or ordering of
the effectiveness of such registration statement.

                  "Registration  Expenses"  shall mean all expenses  incurred by
the  Company  in  compliance  with the  provisions  of  Sections 2 and 3 hereof,
including,  without  limitation,  all  registration  and filing  fees,  printing
expenses,  fees and disbursements of counsel for the Company,  blue sky fees and
expenses,  and the expenses 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).

                  "Selling  Expenses" shall mean all underwriting  discounts and
selling commissions  applicable to the sale of Shares and Warrant Shares and all
fees and disbursements of counsel to Shareholder.

                  "Shares" means the shares of the Company's common stock 
described in the recital above.
<PAGE>

                  "Shareholder"  means the holder of the Company's common stock 
set forth on the Signature Page.

                  "Warrant  Shares"  means the shares  issuable upon exercise of
the warrants described in the recital above.

         2.       Company Registration.

                 (a)  Notice of  Registration.  If, at any time after November 
9, 1995, the Company shall determine to register any of its securities  either
 for its own account or the account of a security holder or holders  exercising
 their respective  demand registration  rights,  other than a  registration  
relating  solely to  employee benefit  plans,  or a  registration  relating
solely to a  Commission  Rule 145 transaction, or a registration on any 
registration  form which does not permit secondary sales, the Company will:

                           (i) promptly give to  Shareholder  written  notice
 thereof (which shall include a list of the  jurisdictions  in which the
 Company  intends to attempt to qualify such securities under the applicable 
blue sky or other state  securities  laws);and

                           (ii) include in such  registration (and any related
 qualification  under blue sky laws or other compliance), and in any 
underwriting  involved therein,  all the Shares and Warrant Shares 
specified in a written  request or requests, made by Shareholder  within
fifteen (15) days after receipt of the written  notice from the Company 
described in clause (i) above,  except as set forth in Section 2(b)
below.

                  (b)  Underwriting.  If the  registration  of which the Company
gives notice is for a registered public offering involving an underwriting:  the
Company shall so advise Shareholder as part of the written notice given pursuant
to Section  2(a)(i).  In such event,  the right of Shareholder  to  registration
pursuant to this Section 2 shall be conditioned upon Shareholder's participation
in such  underwriting  and the  inclusion  of  Shareholder's  Shares and Warrant
Shares in the  underwriting to the extent  provided  herein.  Shareholder  shall
(together  with  the  Company,  its  directors  and  officers,   and  any  other
shareholders distributing their securities through such underwriting) enter into
an underwriting agreement in customary form with the underwriter or underwriters
selected for underwriting by the Company.

     Notwithstanding  any other  provision of this Section 2, if the underwriter
determines  that marketing  factors require a limitation on the number of shares
to be  underwritten,  the  underwriter  may exclude from such  registration  and
underwriting  some or all of the Shares and Warrant Shares which would otherwise
be underwritten pursuant hereto. Any securities so excluded shall be apportioned
pro  rata  among  Shareholder  and any  other  shareholders  distributing  their
securities through such underwriting according to the total amount of securities
otherwise  entitled to be included therein owned by such shareholders or in such
other proportions as shall mutually be agreed upon.

     If Shareholder  disapproves of the terms of any such  underwriting,  it may
elect  to  withdraw   therefrom  by  written  notice  to  the  Company  and  the
underwriter.  Any Shares and  Warrant  Shares  excluded or  withdrawn  from such
underwriting shall be withdrawn from such registration.
<PAGE>

     The Company  shall bear all  Registration  Expenses  incurred in connection
with any  registration,  qualification and compliance by the Company pursuant to
this  Section  2. All  Selling  Expenses  shall be borne by the  holders  of the
securities so registered  pro rata on the basis of the number of their shares so
registered.

         3.  Form S-3  Registration.  In case the  Company  shall  receive  from
Shareholder a written request that the Company effect a registration on Form S-3
and any related qualification or compliance with respect to all or a part of the
Shares and Warrant Shares owned by Shareholders, the Company will at such time:

                  (a) promptly give written notice of the proposed registration,
and any related qualification or compliance, to all other holders of Form S-3
registration rights;

                  (b) as soon as practicable,  effect such  registration and all
such  qualifications  and compliances as may be so requested and as would permit
or facilitate the sale and distribution of all or such portion of the Shares and
Warrant  Shares of  Shareholder  and any other  holder of Form S-3  registration
rights  joining in such  request as are  specified  in a written  request  given
within 15 days after  receipt  of written  notice  from the  Company;  provided,
however,   that  the  Company   shall  not  be  obligated  to  effect  any  such
registration,  qualification,  or compliance  pursuant to this Section 3: (i) if
Form S-3 is not available for such offering by Shareholder;  (ii) if Shareholder
is eligible to sell Shares and Warrant  Shares under SEC Rule  144(k);  (iii) if
Shareholder,  together  with the holder of any other  securities  of the Company
entitled to inclusion in such  registration  proposes to sell Shares and Warrant
Shares and such other  securities  (if any) at an aggregate  price to the public
(net of any underwriters'  discounts or commissions) of $1,000,000 or less; (iv)
if the  Company  shall  furnish  to  Shareholder  a  certificate  signed  by the
President of the Company stating that in the good faith judgment of the Board of
Directors of the Company,  it would be seriously  detrimental to the Company and
its  stockholders for such Form S-3 Registration to be effected at such time, in
which event the Company shall have the right to defer the filing of the Form S-3
registration  statement  for a period of not more than 90 days after  receipt of
the request of  Shareholder  under this Section 3, provided,  however,  that the
Company shall not utilize this right more than once in any twelve-month  period;
or (v) if the Company has already  effected  one such  registration  on Form S-3
within the calendar year; and

                  (c)  subject  to  the  foregoing,  the  Company  shall  file a
registration  statement  covering  the  Shares  and  Warrant  Shares  as soon as
practicable after receipt of the request of Shareholder.  The Company shall bear
all  Registration   Expenses  incurred  in  connection  with  any  registration,
qualification  and  compliance  by the Company  pursuant to this  Section 3. All
Selling  Expenses  shall be borne by the holders of the securities so registered
pro rata on the basis of the number of their shares so registered. Registrations
effected  pursuant to this Section 3 are  registrations  requiring the giving of
notice as provided in Section 2. The Company  shall not be  obligated  to effect
registrations pursuant to this Section 3 prior to November 9, 1995.


<PAGE>

     4.  Registration   ProceduresRegistration   Procedures.   In  the  case  of
registration  effected by the Company  pursuant to this  Agreement,  the Company
will keep  Shareholder  advised in writing as to the initiation of  registration
and as to the completion thereof. At its expense, the Company will:

                  (a) keep  such  registration  effective  for a  period  of one
hundred twenty (120) days or until  Shareholder  has completed the  distribution
described  in the  registration  statement  relating  thereto,  whichever  first
occurs;

                  (b) furnish such number of prospectuses  and other documents
incident thereto as Shareholder from time to time may reasonably request; and

                  (c) use its best efforts to register or qualify the Shares and
Warrant  Shares under the securities or blue sky laws of such  jurisdictions  as
Shareholder  may  request;  provided,  however,  that the  Company  shall not be
obligated  to  register  or  qualify  such  Shares  and  Warrant  Shares  in any
particular  jurisdiction  in which the  Company  would be  required to execute a
general  consent to service  of  process in order to effect  such  registration,
qualification,  or compliance,  unless the Company is already subject to service
in such  jurisdiction  and except as may be  required by the  Securities  Act or
applicable rules or regulations thereunder.

         5.       Indemnification.

                  (a) The Company, with respect to registration,  qualification,
and  compliance  effected  pursuant to this  Agreement,  will indemnify and hold
harmless  Shareholder,  each of its  officers  and  directors,  and  each  party
controlling  Shareholder,  and each  underwriter,  if any,  and each  party  who
controls any underwriter,  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  prospectus,
offering  circular,  or  other  document  (including  any  related  registration
statement,  notification,  or  the  like)  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 not  misleading,  or any violation by the Company of the
Securities  Act or any rule or regulation  thereunder  applicable to the Company
and relating to action or inaction  required of the Company in  connection  with
any  such  registration,   qualification,  or  compliance,  and  will  reimburse
Shareholder,  its officers and directors, and any party controlling Shareholder,
such underwriter and party who controls any such underwriter,  for any legal and
any other expenses  incurred in connection with  investigating  or defending any
such claim, loss, damage,  liability,  or action, provided that the Company will
not be liable 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  based  solely upon  written  information  furnished  to the Company by
Shareholder  or  such  underwriter,  as  the  case  may  be,  and  stated  to be
specifically for use therein.

                  (b) Shareholder  will, if Shares and Warrant Shares held by it
are included in the securities as to which such registration,  qualification, or
compliance is being effected,  indemnify and hold harmless the Company,  each of
its  directors  and  officers,  and each  underwriter,  if any, of the Company's
securities covered by such a registration statement, and each party who controls
<PAGE>

the  Company or such  underwriter,  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, its officers and directors, and the
underwriters  or control  persons,  if any, 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 solely in reliance upon and in
conformity with written information  furnished to the Company by Shareholder and
stated  to  be  specifically  for  use  therein;  provided,  however,  that  the
obligations of Shareholder  hereunder shall be limited to an amount equal to the
proceeds to Shareholder of securities sold as contemplated herein.

                  (c) Each party entitled to indemnification  under this Section
5 (the  "Indemnified  Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit the  Indemnifying  Party to assume  the  defense of any such claim or any
litigation  resulting  therefrom,  provided  that  counsel for the  Indemnifying
Party,  who shall conduct the defense of such claim or any litigation  resulting
therefrom,  shall be approved by the Indemnified Party (whose approval shall not
unreasonably  be withheld),  and the  Indemnified  Party may participate in such
defense at such party's expense  (unless the  Indemnified  Party shall have been
advised by counsel  that actual or  potential  differing  interests  or defenses
exist or may exist between the Indemnifying  Party and the Indemnified Party, in
which case such expense shall be paid by the Indemnifying  Party),  and provided
further  that the  failure of any  Indemnified  Party to give notice as provided
herein shall not relieve the  Indemnifying  Party of its obligations  under this
Section  5.  No  Indemnifying  Party,  in the  defense  of  any  such  claim  or
litigation,  shall,  except with the consent of  Indemnified  Party,  consent to
entry of any judgment or enter into any settlement  which does not include as an
unconditional  term  thereof  the giving by the  claimant or  plaintiff  to such
Indemnified  Party of a release  from all  liability in respect to such claim or
litigation.

     6.  Information by  Shareholder.  Shareholder  shall furnish to the Company
such information  regarding Shareholder as the Company may reasonably request in
writing and as shall be reasonably required in connection with any registration,
qualification, or compliance referred to in this Agreement.

     7. Transfer of Registration  Rights. The rights set forth in this Agreement
may be transferred  in any transfer of the Shares,  provided that the Company is
given written notice of such transfer, and provided further, that the rights set
forth in this  Agreement may only be  transferred  to a single  transferee of at
least 125,000 shares of common stock.

     8.  Governing  Law.  This  Agreement  shall be governed by and construed in
accordance with the laws of the State of California.
<PAGE>

     9.  Counterparts.   This  Agreement  may  be  executed  in  any  number  of
counterparts,  each of which  shall be an  original,  but all of which  together
shall constitute one instrument.

         IN WITNESS  WHEREOF,  the undersigned  purchasers of securities and the
Company have executed this Agreement on the day and year indicated above.

                                    COMPANY:

                                    IMATRON INC.

                                    By:_____________________________
                                                President


                                    PURCHASER:

                                            --------------------------------
                                            Name of Purchaser

                                            --------------------------------
                                            Signature

                                            --------------------------------
                                            Title

                                            --------------------------------
                                            Shares of Common Stock

                 SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT
<PAGE>

                              IMATRON INC. FORM S-3

                 Schedule to Exhibit 4.5 Pursuant to Instruction
                     Number 2 to Item 601 of Regulation S-K


         The Form of Registration  Rights Agreement filed as Exhibit 4.5 to this
Registration  Statement is substantially  identical in all material  respects to
each of the Registration  Rights Agreements between the Company and investors in
the Private Offering  conducted by the Company which concluded October 19, 1995.
This Schedule relates to each Registration  Rights Agreement for those investors
whose Common Stock is being registered for sale by this Registration  Statement.
The Schedule sets forth the material details of all such Agreements which differ
from the Exhibit filed herewith.

Name of Shareholder                      Number of Common Shares Purchased

Arbinter-Omnivalor S.A.                          500,000

Banque Ehinger & Cie AG                          300,000

Banque Franck S.A.                               550,000

Banque Genevoise de Gestion                      175,000

Banque Privee Edmond de Rothschild S.A.           50,000

Banque Scandinave en Suisse                      500,000

Codell Holdings, Ltd.                            138,890

Experta Trustee Ltd.                             400,000

Experta Trustee Ltd.                              55,555

Heritage Finance & Trust Company                 185,000

International Industrial Bank(assigned           500,000
Warrant to Intercapital Limited)

Jose Maria Salema Garcao                         550,000

Jose Maria Salema Garcao                         300,000

Jose Osvaldo Gomez                               300,000

Montrachet Norstar Investment                     55,555
<PAGE>

                                   Exhibit 4.6


<PAGE>

THESE  SECURITIES  HAVE NOT BEEN  REGISTERED  WITH THE  SECURITIES  AND EXCHANGE
COMMISSION UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND ANY SALE, TRANSFER,
PLEDGE OR OTHER DISPOSITION THEREOF 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.


                                  IMATRON INC.

                          COMMON STOCK PURCHASE WARRANT

                     This Warrant Expires December 31, 1996

Warrant No. B-018T                                             Shares: 65,000

         THIS CERTIFIES  that,  subject to the terms and  conditions  herein set
forth,  Donaghy Inc. (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.

     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) shall be One Dollar and Fifty Cents  ($1.50).  The purchase  price of
one share of Common Stock is referred to herein as the "Warrant Price".

     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)
<PAGE>

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 and/or all other  additional stock receivable by
it as aforesaid during such period,  given effect to all adjustments  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 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, 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
<PAGE>

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 "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 Act.

         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
<PAGE>

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 December 31, 1996.

         ISSUED this 15th day of April, 1996.

                                    IMATRON INC.


                                    By:_____________________________________
                                              S. Lewis Meyer, President
ATTEST:


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


<PAGE>



                                   Exhibit 5.1



<PAGE>



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

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


                                  May 10, 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 2,645,144  shares of the Company's Common Stock (the "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  were due
execution and delivery are a prerequisite to the effectiveness thereof.

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

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

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

         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


<PAGE>


                                  Exhibit 24.1


<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  2,645,144   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

May 6, 1996



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