IMATRON INC
424B3, 1996-10-02
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                                   PROSPECTUS

                                3,810,155 Shares

                                  IMATRON INC.

                            Common Stock No Par Value

         This Prospectus relates to the sale of up to 3,810,155 shares of Common
Stock,  no par value,  of Imatron Inc. (the  "Company") by  shareholders  of the
Company (the  "Selling  Shareholders").  A total of 69,542  shares are currently
issued and outstanding (the "Outstanding Shares"); a total of 540,613 shares are
issuable  upon the  exercise  of  outstanding  warrants  (the  "Warrants")  (the
"Warrant  Shares");  and a total  of  3,200,000  shares  are  issuable  upon the
exercise of  outstanding  Common Stock exchange  rights (the "Exchange  Rights")
(the "Exchange Rights Shares"). All of the Outstanding Shares, the Warrants, and
the  Exchange  Rights  were  previously  issued by the  Company  to the  Selling
Shareholders  in private  transactions.  The  Outstanding  Shares,  the  Warrant
Shares,  and the Exchange  Rights  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 September 30, 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......................................................13

PLAN OF DISTRIBUTION..................................................... 16

EXPERTS ................................................................. 17

LEGAL OPINION............................................................ 17


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<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; the Company's Report on Form 10-Q for the period
ended June 30, 1996,  filed August 14, 1996;  the Form 10-Q for the period ended
March 31, 1996,  filed on May 15, 1996;  and the  description  of the  Company's
Common Stock contained in a registration statement filed under the Exchange Act,
including  any  amendment  or report  filed for the  purpose  of  updating  such
description,  are hereby  incorporated  by reference into this  Prospectus.  All
documents  filed by the Company with the Commission  pursuant to Sections 13(a),
13(c),  14 or 15(d) of the  Exchange Act after the date of this  Prospectus  and
prior to the  termination  of the offering of Common Stock shall be deemed to be
incorporated  by reference into this Prospectus and to be a part hereof from the
date of filing of such documents, except the Board Compensation Committee Report
on  Executive  Compensation  and the  Performance  Graph  included  in the Proxy
Statement  pursuant  to Item 402(k) and (l) of  Regulation  S-K.  Any  statement
contained in a document  incorporated by reference  herein shall be deemed to be
modified or  superseded  for  purposes of this  Prospectus  to the extent that a
statement  contained  herein or in any other  subsequently  filed document which
also  is or is  deemed  to be  incorporated  by  reference  herein  modifies  or
supersedes such statement.  Any statement so modified or superseded shall not be
deemed,  except as so  modified  or  superseded,  to  constitute  a part of this
Prospectus.  The Company will provide  without charge to each person,  including
any beneficial owner, to whom this Prospectus is delivered, upon written or oral
request of such person,  a copy of any and all of the information  that has been
incorporated  by  reference  in  this  Registration  Statement  filed  with  the
Commission  under the Exchange  Act with respect to the Common Stock  offered by
the Prospectus,  other than certain  exhibits to such  documents.  Such requests
should be directed to the Chief  Financial  Officer,  Imatron  Inc.,  389 Oyster
Point Boulevard,  South San Francisco,  California 94080, telephone number (415)
583-9964.

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<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 opened 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,
increases  the  demand  for  Imatron's   C-150/Evolution  scanner  currently  in
distribution.  HeartScan management believes that the market 

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<PAGE>

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 CT7 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.  Through the
first six months of 1996 the Company recorded a net loss of $5,023,000. 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 three  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.  Through the first
six months of 1996, the Company raised  $14,570,000  (net of offering  costs) in
one  public  offering  and a  number  of  private  placements  to  institutional
investors.  In  addition,  during the third  quarter of 1996 the Company  gained
$1,757,000 from the sale of its interest in InVision Technologies, Inc., a joint
venture it helped  establish in 1990. The Company has an accumulated  deficit of
$62,580,000.

         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

                                       5
<PAGE>

license additional portions of its technology,  to sell some or all of its other
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.  The
Company and HSI completed an offering of HSI Series A Preferred Stock to certain
institutional investors in June 1996. The offering raised a total of $14,866,000
(net of offering  costs).  Imatron has  contributed  the net  proceeds  from the
offering to HSI. In the event HSI cannot raise necessary additional financing in
the future it will have to curtail its expansion activities.

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

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

         Limited  Clinical  Demonstration  of Certain  Advantages  of  Company's
Scanner.  The  Company's  scanners have been used in a clinical  environment  on
humans since April,  1983.  Clinical use of the C-100 XL scanner  model began in
February  1989 and  twenty-seven  C-150  scanners are  currently  installed in a
clinical  setting.  The Company believes that market acceptance of the ULTRAFAST
CT  scanner   continues  to  depend  in  substantial   part  upon  the  clinical
demonstration  of  certain  asserted  technological  advantages  and  diagnostic
capabilities.  There is no assurance  that these  advantages  will result in the
development  of a  significant  market for the  ULTRAFAST CT that will allow the
Company to operate profitably.

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

         Reliance On Patents And Proprietary Technology.  Imatron relies heavily
on proprietary technology which it attempts to protect through patents and trade
secrets.

         In February  1981,  the Company was granted the  exclusive use for five
years and  non-exclusive  use  thereafter  of  certain  technology  and a patent
pending owned by the University of California  (UC) under the terms of a license
agreement  between  UC  and  Emersub,  a  wholly-owned  

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<PAGE>

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

         In addition, the sublicense agreement, as amended, requires the Company
to pay annual  royalties  to Emersub  equal to 2.125% of net sales of certain of
the Company's  products.  The Company's  Chairman of the Board,  Dr.  Douglas P.
Boyd, receives 6% of all of the royalties paid by Emersub to UC. Loss by Imatron
of its rights under the patent as a result of termination of its sublicense from
Emersub,  or the underlying  license,  could have a material adverse effect upon
Imatron's  business and future  prospects.  There are no present  disputes  with
either UC or Emersub.

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

         In addition,  Imatron holds  twenty-seven U.S. Patents of its own (each
with a  remaining  life in excess of 3 years) and has filed  three  U.S.  patent
applications  covering  various  integral  components of the scanner  including,
among others,  its electron  beam assembly and its x-ray  detector and has filed
applications  corresponding  to several of these  patents  and  applications  in
various European Patent Convention countries,  Canada and Japan. There can be no
assurance that any such  applications will result in the issuance of a patent to
the Company.  Imatron's patents and patent  applications have not been tested in
litigation and no assurance can be given that patent  protection  will be upheld
or will be as extensive as claimed. Furthermore, no assurance can be given as to
the Company's ability to finance  litigation  against parties which may infringe
upon  such  patents  or  parties  which  may claim  that the  Company's  scanner
infringes upon their patents.  However,  the agreement signed by the Company and
Siemens Corporation in March 1991 allows Siemens Corporation to enter litigation
in favor of Imatron.

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

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<PAGE>

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.

         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
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.

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

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

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

         The FDA also regulates the safety and efficacy of radiological devices.
Although  the  Company   believes  it  is  in  compliance  with  all  applicable
radiological  health  regulations  promulgated  by  the  FDA,  there  can  be no
assurance  that the  ULTRAFAST CT scanner will  continue to comply with all such
standards and regulations that may be promulgated. In any event, compliance with
all such  requirements  can be  costly  and  time  consuming,  with a  resultant
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

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<PAGE>

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.

         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 

                                       10
<PAGE>

companies named above markets  equipment using one or more of these  techniques.
All of these  companies  have greater  financial  resources  and larger and more
established  staffs  than those of the Company  and their  products  are in most
cases substantially less expensive than the ULTRAFAST CT scanner.

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

         Also,  the Company  believes that  customers  and  potential  customers
expect a continuing development effort to improve the functionality and features
of the scanner.  The Company  continually seeks to develop product  enhancements
and improve  product  reliability.  Imatron's  future  success may depend on its
ability to complete certain product enhancement and product reliability projects
currently  in  progress,  as well as on its  continued  ability to  develop  new
products  or  product  enhancements  in  response  to new  products  that may be
introduced by other  companies.  There can be no assurance  that Imatron will be
able to continue to improve product  reliability or introduce new product models
or product enhancements as required to remain competitive.

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

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

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

                                       11
<PAGE>

                                 USE OF PROCEEDS

         The 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 to increase working capital.

                                 OFFERING PRICE

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


                                       12
<PAGE>

                              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:


                                Shares      Shares Available   Percent Owned 
    Name of Selling          Beneficially   for Sale Under    After Completion 
    Securityholder             Owned(1)     this  Prospectus  of the Offering(2)
    ---------------          ------------   ----------------  ------------------
Ambient Capital Group,            102,398           102,398           *
Inc.(3) (4)

Banque Privee Edmond de            69,655            19,200           *
Rothschild, S.A.
Geneva

Forbes W. Burtt (5)                 4,516             4,516           *

Michel Cornis                      10,000            10,000           *

Cramer, Rosenthal, McGlynn,         9,600             9,600           *
Inc.

Credit Suisse (Guernsey)           25,600            25,600           *
Limited

CRM Madison Partners, L.P.         38,400            38,400           *

CRM Partners, L.P.                155,200           155,200           *

CRM Retirement Partners, L.P.      76,800            76,800           *

Elliott Associates, L.P. (6)      266,560           266,560           *

Joseph P. Galichia, M.D.           80,000            80,000           *

                                       13
<PAGE>


Global Bermuda Limited            500,000           500,000           *
Partnership

Grace Brothers, Ltd.              180,000           180,000           *

Heritage Finance & Trust            9,032             9,032           *
Company

A.B. Laffer, V.A. Canto &           9,600             9,600           *
Associates

Lakeshore International Ltd.      104,000           104,000           *

Lagunitas Partners L.P.            80,000            80,000           *

Libra Investments, Inc.            22,581            22,581           *

Merced Partners Limited           196,000           196,000           *
Partnership

Modern Woodmen of America          80,000            80,000           *

Robert G. Morrish (5)               2,258             2,258           *

Gary Post (3)                     316,793           316,793           *

Stephen P. Rader and Anne W.       14,400            14,400           *
Rader, and their successors,
as trustees of the Rader
Living Trust dated 9/9/94

Ravich Revocable Trust of 1989    211,290           211,290           *

Reinfrank Living Trust UA          14,400            14,400           *
6/13/95


                                       14
<PAGE>

SC Fundamental Value BVI,         304,000           304,000           *
Ltd. (7)

SC Fundamental Value Fund,        696,000           696,000           *
L.P. (7)

Jonathan Schwartz (5)               4,516             4,516           *

Mark S. Siegel                      3,360             3,360           *

The Shemano Group, Inc. fbo        35,000            35,000           *
Gary J. Shemano  (8)

The Shemano Group, Inc. fbo        33,000            33,000           *
Michael R. Jacks (8)

The Shemano Group, Inc. fbo         2,000             2,000           *
William David Corbett & Mary
Corbett Jt. Ten. (8)

Sitrick and Company Inc. (9)      132,059            66,371           *

Kathleen Sullivan                  28,005             3,840           *

Westgate International, L.P.      133,440           133,440           *
(6)

All Selling Shareholders as a   3,950,463         3,810,155           *
Group


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

(1)  Includes  shares  owned  prior to this  offering  and the shares  which are
     issuable upon the exercise of the Exchange  Rights and 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 below.
                                       15
<PAGE>

(2)  Percentages  are based upon the assumption that upon the completion of this
     offering  the  respective  Selling  Shareholder  has sold the Common  Stock
     listed  as  "Shares  Available  for Sale  Under  this  Prospectus"  and are
     computed  on the basis of  76,659,943  shares of Common  Stock  issued  and
     outstanding as of August 23, 1996.
(3)  Ambient  Capital  Group,  Inc.  is 48% owned by Gary Post and he shares the
     power to vote and dispose of the Shares owned by Ambient.
(4)  Ambient Capital Group, Inc. has provided financial  consulting  services to
     the Company and its  subsidiary  HeartScan  Imaging,  Inc. at varying times
     during the past three years.
(5)  Forbes W. Burtt,  Robert G. Morrish and  Jonathan  Schwartz are employed by
     Libra Investments,  Inc., a company which has provided financial consulting
     services to the  Company and  HeartScan  at varying  times  during the past
     three  years.  Jess M.  Ravich  is the  controlling  shareholder  of  Libra
     Investments,  Inc.  and shares the power to vote and  dispose of the Shares
     owned by Libra.
(6)  Paul E. Singer,  either  directly or  indirectly,  may be deemed to control
     each  of  these   entities.   Elliott   Associates,   L.P.   and   Westgate
     International,  L.P. may be deemed to be a group for purposes of Rule 13d-3
     promulgated under the Securities Exchange Act of 1934, as amended.
(7)  Gary  Siegler  and  Peter  Collery  own  controlling  interests  in both SC
     Fundamental  Value BVI, Ltd. And SC Fundamental  Value Fund,  L.P. and each
     individual shares the power to vote and dispose of the Shares owned by such
     Selling Shareholders.
(8)  Gary J. Shemano, Michael R. Jacks and William David Corbett are employed by
     The Shemano Group, Inc., a company which has provided financial  consulting
     services to the  Company and  HeartScan  at varying  times  during the past
     three years.
(9)  Sitrick and Company Inc. has provided public relations  consulting services
     to the Company and HeartScan at varying times during the past two years.

                              PLAN OF DISTRIBUTION

         The Selling  Shareholders  have  advised  the Company  that the Selling
Shareholders  intend to sell their Shares from time to time in private or public
transactions,  in transactions  involving principals,  in transactions involving
brokers,  or by any other lawful  methods.  Sales through brokers may be made by
any method of trading  authorized  by the NASDAQ  National  Market System or any
stock  exchange on which the Shares of Common Stock may be listed in the future,
including  block  trading  in  negotiated  transactions.  Without  limiting  the
foregoing,  such  brokers  may act as  dealers by  purchasing  any or all of the
Shares covered by this Prospectus,  either as agents for others or as principals
for their own accounts and reselling such shares pursuant to this Prospectus. In
sales made through  underwriters,  dealers or brokers, such entities 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.

         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.

                                       16
<PAGE>

                                     EXPERTS

         The consolidated  financial statements of Imatron Inc.  incorporated by
reference  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.


                                       17
<PAGE>





No dealer,  salesman or any other person
has   been   authorized   to  give   any
information     or    to    make     any
representation  not  contained  in  this          3,810,155 Shares      
Prospectus in connection  with the offer                                
made  hereby.  If given  or  made,  such                                
information or  representation  must not                                
be relied upon as having been authorized                                
by Imatron Inc. This Prospectus does not                                
constitute   an   offer  to  sell  or  a            IMATRON INC.        
solicitation  of an  offer  to  buy  any                                
securities other than those specifically         No Par Common Stock    
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             PROSPECTUS         
shall under any circumstances create any                                
implication    that   the    information                                
contained  herein is  correct  as of any        
time subsequent to the date hereof.              SEPTEMBER 30, 1996



                                         
                                       18


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