IMATRON INC
S-3, 1998-05-06
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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     As filed with the Securities and Exchange Commission on May 6, 1998
                          Registration No. 333-________


                                    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
                                 (650) 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
                                 (650) 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, 26th Floor
                         San Francisco, California 94111
     

Approximate  date of commencement  of proposed sale to the public:  From time to
time after the effective date of 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 )

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

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

If delivery  of the  prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box: (  )

<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
<S>  <C>             <C>            <C>                 <C>                   <C>
Title of Each Class                 Proposed Maximum    Proposed Maximum
Of Securities To Be  Amount To Be   Offering Price      Aggregate Offering    Amount Of
Registered           Registered     Per Share (1)       Price (1)             Registration Fee

Common Stock         15,037,875     $2.77               $41,654,914           $12,228
                     Shares
</TABLE>


(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, 1998, as reported on the NASDAQ National Market System.


THE  REGISTRANT  HEREBY  AMENDS  THIS  REGISTRATION  STATEMENT  ON SUCH  DATE OR
DATE(S),  AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE  DATE UNTIL THE  REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY  STATES THAT THIS REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT OF 1933 OR UNTIL THE  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE  COMMISSION  ACTING  PURSUANT TO SAID SECTION 8(A)
MAY DETERMINE.

                                       ii
<PAGE>

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

                   SUBJECT TO COMPLETION, DATED MAY 6, 1998

                                   PROSPECTUS

                                15,037,875 Shares

                                  IMATRON INC.

                            Common Stock No Par Value

This Prospectus  relates to the sale of up to 15,037,875 shares of Common Stock,
no par value,  of Imatron Inc. (the  "Company") by  shareholders  of the Company
(the "Selling Shareholders").  A total of 36,868 shares are currently issued and
outstanding (the "Outstanding Shares"); a total of 4,334,340 shares are issuable
upon the  exercise  of  outstanding  warrants  (the  "Warrants")  (the  "Warrant
Shares");  and a total of  10,666,667  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 May 6, 1998

                                       1
<PAGE>


                                TABLE OF CONTENTS

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

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

THE COMPANY...................................................................3

DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS...............................5

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

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

OFFERING PRICE...............................................................13

SELLING SHAREHOLDERS.........................................................13

PLAN OF DISTRIBUTION.........................................................15

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

LEGAL OPINION................................................................16


                                       2

<PAGE>


                              AVAILABLE INFORMATION

Imatron  Inc.  ("Imatron"  or the  "Company")  is subject  to the  informational
requirements  of the  Securities  and  Exchange  Act of 1934,  as  amended  (the
"Exchange Act"), and, in accordance therewith,  files reports,  proxy statements
and  other  information  with  the  Securities  and  Exchange   Commission  (the
"Commission"). Such reports, proxy statements and other information filed by the
Company  with the  Commission  can be inspected  and copied at the  Commission's
Public Reference Section,  450 Fifth Street,  N.W.,  Washington,  D.C. 20549, as
well as at the following Regional Offices of the Commission:  Northeast Regional
Office,  7 World Trade Center,  Suite 1300, New York, New York 10048 and Midwest
Regional Office, 500 West Madison Street,  Suite 1400, Chicago,  Illinois 60661.
Copies  of such  material  can be  obtained  by mail from the  Public  Reference
Section of the Commission, at 450 Fifth Street, N.W., Washington, D.C. 20549, at
prescribed rates. The Commission's Internet address is  http://www.sec.gov.  The
Commission's Web site also contains reports,  proxy and information  statements,
and other information  regarding the Company that has been filed  electronically
with the  Commission.  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, 1997,
filed  April 16,  1998 (File No.  0-12405)  and all  amendments  thereto 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
(650) 583-9964.

                                       3
<PAGE>

                                   THE COMPANY

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

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

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

Imatron was incorporated in New Jersey in February,  1983. Its executive offices
are  located at 389 Oyster  Point  Boulevard,  South San  Francisco,  California
94080, and its telephone number is (650) 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.

                                       4
<PAGE>

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 (650) 583-9964.

                 DISCOSURE REGARDING FORWARD-LOOKING STATEMENTS

The  Prospectus,  including all documents  incorporated  by reference,  includes
"forward-looking" statements within the meaning of Section 27A of the Securities
Act and Section 21E of the  Exchange Act and the Private  Securities  Litigation
Reform Act of 1995. The  forward-looking  statements in this Prospectus  reflect
the  Company's  current  views  with  respect  to future  events  and  financial
performance.  These forward-looking  statements are subject to certain risks and
uncertainties,  including  specifically  an absence of significant  revenues,  a
history of losses, no assurance that technology can be completed or that it will
not be delayed,  significant competition, the uncertainty of proprietary rights,
the uncertainty as to indemnification  risks, possible adverse effects of future
sales of shares on the  market,  trading  risks of  low-priced  stocks and those
other risks and uncertainties  discussed herein, that could cause actual results
to differ  materially  from  historical  results or those  anticipated.  In this
Prospectus,  the words "anticipates,"  "believes," "expects," "intends," "future
and  similar  expressions  identify  forward-looking  statements.   Readers  are
cautioned to consider the specific  risk factors  described  herein and in "Risk
Factors,"  and not to place  undue  reliance on the  forward-looking  statements
contained herein, which speak only as of the date hereof. The Company undertakes
no obligation  to publicly  revise these  forward-looking  statements to reflect
events or  circumstances  that may arise after the date hereof.  All  subsequent
written and oral  forward-looking  statements  attributable to the Company or to
persons  acting on its behalf are expressly  qualified in their entirety by this
section.

                                  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
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.  In 1994,  Imatron,  as a stand alone company,  incurred its first
year of net income from operations  amounting to $3,221,000  which was partially
offset by $911,000 of net losses by  HeartScan.  In 1997,  1996,  and 1995,  the
Company  incurred  net  losses  of  $11,422,000,  $13,737,000,  and  $2,449,000,
respectively.  The net losses are  partially  a result of the  operating  losses

                                       5
<PAGE>

incurred by HeartScan which amounted to $8,172,000,  $7,845,000,  and $2,132,000
in the years ended  December 31, 1997,  1996,  and 1995,  respectively.  The net
losses  incurred by HeartScan  reflect  non-cash  minority  interest  expense of
$1,744,000 and  $3,272,000  recorded in both 1997 and 1996,  respectively,  as a
result  of the  accounting  treatment  relative  to  its  convertible  Series  A
Preferred Stock having "beneficial  conversion features".  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.  In 1996,
the Company received  $16,672,000 through the sale of shares of common stock and
the exercise of warrants and stock options for shares of common  stock.  Also in
1996, HeartScan raised $14,798,00 (net of offering costs) for use exclusively to
develop its operations.  As of December 31, 1997, the Company has a consolidated
accumulated  deficit of  $82,716,000.  As of December 31, 1997,  HeartScan has a
accumulated deficit of $20,044,000.

The Company's  liquidity is affected by many  factors,  some based on the normal
ongoing  operations of the business and others related to the  uncertainties  of
the industry and global economies. Although the cash requirements will fluctuate
based on timing and extent of these factors, management believes that cash, cash
equivalents,  and short-term  investments existing at December 31, 1997 together
with the borrowing capability,  and the estimated proceeds from ongoing sales of
products  and  services in 1998 will  provide the  Company  and  HeartScan  with
sufficient  cash for  operating  activities  and  capital  requirements  through
December 31, 1998.

Material Dependence Upon Key Personnel.  The Company and HeartScan have 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.
The C-150 ULTRAFAST CT scanner was first used in 1992. Fifty-four 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 asserted technological

                                       6
<PAGE>

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

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

In February  1981,  the Company was granted the exclusive use for five years and
non-exclusive use thereafter of certain technology and a patent pending owned by
the University of California (UC) under the terms of a license agreement between
UC and Emersub, a wholly-owned  subsidiary of a former principal  shareholder of
the Company,  and a sublicense  agreement between Emersub and Imatron Associates
(the  predecessor to the Company),  respectively.  In June 1986, the license and
sublicense  agreements were amended to extend the Company's exclusive use of the
technology  through January 2000, the expiration 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.

Under the continuing sublicense  agreement,  as amended, the Company is required
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.

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.

                                       7
<PAGE>
        
In addition,  Imatron holds  twenty-eight  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 partial 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 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.

In September 1995,  Siemens  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  substituted a patent,  subject to existing
license-back,  currently used in its  technology for the previously  transferred
patent. Representatives of Siemens have agreed with the Company to these terms.
         
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 scanner at its
South San Francisco,  California  facility.  To date, the typical  manufacturing
cycle  has  required   approximately   six  months  from  the  authorization  of
manufacturing to the delivery of a scanner.

                                       8
<PAGE>

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 prepayment 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
prepayment  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 Company's 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

                                       9
<PAGE>

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 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.

                                       10
<PAGE>

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,  1993 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.  In  November,  1996 and again in  January,  1997,  the FDA  conducted
routine  inspections of Imatron's  manufacturing  operations.  Both  inspections
concluded  without Notices of Observations.  Imatron  frequently  provides field
modifications  or updates of  components  and  software  to  operational  sites.
Imatron  voluntarily advised the FDA during these inspections that certain field
corrections  were ongoing.  The FDA concurred with  Imatron's  decision to field
upgrade certain sites and assigned recall numbers  Z-304/307-7 and  Z-298/299-7.
Imatron  is  required  to notify  the FDA  periodically  of the  status of these
corrections  and  again  upon  completion.   Imatron  believes  that  it  is  in
substantial compliance with the regulations promulgated by the FDA.

HeartScan's  activities are subject to extensive regulation,  generally by state
and local government entities.  Although HeartScan believes it is in substantial
compliance with all applicable  radiological  health  standards and regulations,
there can be no  assurance  that its business  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 HeartScan's  business and its
future profitability.  HeartScan'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 Federal Food
and Drug Administration,  Occupational Safety and Health  Administration and the
Environmental  Protection  Agency.  Changes in  governmental  regulations or new
regulations  adopted in the future may  materially  adversely  affect  Imatron's
business.  In some  cases,  state  or local  regulations  may be  stricter  than
regulations imposed by the Federal government.

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,   Toshiba  Medical   Corporation  and  others.
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, as well as ATL,  Accuson and
ADAC Laboratories,  markets equipment using one or more of these techniques. All
of these companies have greater financial resources and larger 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 continue to demonstrate that the ULTRAFAST CT scanner is both an acceptable
substitute  for  conventional  CT scanners  in scanning  areas of the body where

                                       11
<PAGE>

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. 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.  Historically,  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  minimum
obligations  on a  timely  basis.  Failure  by the  distributors  to meet  their
obligations  could  adversely  affect the  Company's  operations  and  financial
position.  As of April 1, 1998, the Company assumed direct  distribution  of
its scanners from Siemens  Corporation,  the Company's  principal  distributors.

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 to increase working capital.

                                       12
<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>

<S>           <C>                                 <C>                    <C>                      <C>
                                                                         Shares Available for     Percent Owned After
              Name of Selling                     Shares Beneficially      Sale Under this        Completion of the
               Securityholder                          Owned(1)               Prospectus              Offering(3)
               --------------                          --------               ----------              -----------

Banque Privee Edmond de Rothschild, S.A.
Geneva                                                   64,000                  64,000(2)               *

Barnfield Limited                                        96,242                  85,333(2)               *

Xing-Rong Chen                                           25,000                  25,000                  *

Cramer, Rosenthal, McGlynn, Inc.                         32,000                  32,000(2)               *

CRM Madison Partners, L.P.                              128,000                 128,000(2)               *

CRM Partners, L.P.                                      517,333                 517,333(2)               *

CRM Retirement Partners, L.P.                           256,000                 256,000(2)               *

Elliott Associates, L.P.(4)                           1,355,933                 888,533(2)               1.69%

Joseph P. Galichia, M.D.                                266,667                 266,667(2)               *

Global Bermuda Limited Partnership                    1,666,667               1,666,667(2)               2.07%

Grace Brothers, Ltd.                                    600,000                 600,000(2)               *

Charles Higgins, M.D.                                    25,000                  25,000                  *

                                       13
<PAGE>

Laffer Associates                                        32,000                  32,000(2)               *

Lagunitas Partners L.P.                                 266,667                 266,667(2)               *

Lakeshore International Ltd.                            346,667                 346,667(2)               *

Merced Partners Limited Partnership
                                                        653,333                 653,333(2)               *

Modern Woodmen of America                               266,667                 266,667(2)               *

Gary Post                                               161,000                  32,000(2)               *

Stephen P. Rader and Anne W. Rader, and
their successors, as trustees of the Rader
Living Trust dated 9/9/94                                48,000                  48,000(2)               *

Ravich Revocable Trust of 1989                          677,957                 666,667(2)               *

Reinfrank Living Trust UA 6/13/95                        48,000                  48,000(2)               *

SC Fundamental Value BVI, Ltd.(5)                     1,013,333               1,013,333(2)               1.27%

SC Fundamental Value Fund, L.P.(5)                    2,320,000               2,320,000(2)               2.85%

Gerhard Sennewald, M.D.                                 100,000                 100,000                  *

Mark S. Siegel                                           11,200                  11,200(2)               *

Sitrick and Company Inc.(6)                             221,208                 221,208                  *

Kathleen Sullivan                                        12,800                  12,800(2)               *

TeraRecon, Inc.                                       4,000,000               4,000,000                  4.82%

Westgate International, L.P.(4)                         894,400                 444,800(2)               *

All Selling Shareholders as a Group                  15,106,074              15,037,875

</TABLE>

* 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.

                                       14
<PAGE>

(2)   Shares are based on the maximum amount available under the Second Exchange
      Period Rights as described in Section 5.3 of the Stock Purchase  Agreement
      dated as of June 24, 1996.
(3)   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  78,967,091  shares of Common  Stock  issued and
      outstanding as of January 31, 1998.
(4)   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.
(5)   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.
 (6)  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.

                                     EXPERTS

The  consolidated  financial  statements  and  schedule  of Imatron  Inc.  as of
December 31, 1997 and for the year then ended have been  incorporated  herein by
reference and in the registration  statement in reliance upon the report of KPMG
Peat Marwick LLP, independent certified public accountants,  incorporated herein
by reference,  and upon the authority of said firm as experts in accounting  and
auditing.

The  consolidated  financial  statements  and  schedule  of Imatron  Inc.  as of
December  31, 1996,  and for each of the two years in the period ended  December
31, 1996,  incorporated  herein by reference and in the  registration  statement

                                       15
<PAGE>

have been audited by Ernst & Young LLP,  independent  auditors,  as set forth in
their report  thereon,  incorporated  herein by  reference,  and are included in
reliance  upon such  report  given 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.












                                       16
<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.

                               15,037,875 Shares
                                  IMATRON INC.
                              No Par Common Stock

                                   PROSPECTUS

                                   May 6, 1998









                                       17
<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.


SEC Registration fee                                             $ 12,228

NASDAQ National Market listing fee                                 17,500

Printing and engraving expenses                                       500

Legal fees and expenses                                             7,500

Accounting fees and expenses2                                       7,500

Total                                                            $ 45,228

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

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

                2  Including legal expenses associated with Blue Sky filings.

                                       18
<PAGE>

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

ITEM 16.  Exhibits.

Exhibit No.   Description

3.1  Certificate of  Incorporation of the Company,  as amended,  as of March 31,
     1983.3

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

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

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

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

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

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

                                       19
<PAGE>
                
3.8  Certificate of Amendment of Certificate of Incorporation filed with the New
     Jersey Secretary of State on July 7, 1997.10

3.9  Bylaws, as amended as of April 30, 1992.11

4.1  Common Stock  Purchase  Agreement  dated June 24, 1996 between the Company,
     HeartScan Imaging Inc., and investors in the HeartScan Imaging, Inc. Series
     A Preferred Stock Private Offering.12

4.2  Warrant  Purchase  Agreement  between the Company and TeraRecon  Inc. dated
     October 15, 1997.13

4.3  Common Stock  Purchase  Warrant  which  expires  October 15, 2001 issued to
     TeraRecon Inc.13

4.4  Warrant  Purchase  Agreement  between the Company and TeraRecon  Inc. dated
     October 21, 1997. 13

4.5  Common Stock  Purchase  Warrant  which  expires  October 21, 2001 issued to
     TeraRecon Inc. 13

4.6  Form of Common Stock Purchase Warrant which expires January 28, 2002 issued
     to investors in connection with a Private Offering which concluded  January
     28, 1997. 13

4.7  Warrant Purchase Agreement between the Company and TeraRecon Inc., dated
     April 24, 1998.

4.8  Common Stock Purchase Warrant which expires April 24, 2002 issued to
     TeraRecon Inc.

- -----------------
                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  the  Company's   Registration
                   Statement on Form 8-K filed with the  Commission on July 17,
                   1997 and incorporated herein by reference.

               11  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.

               12  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, 1995 filed with the Commission on July 1,
                   1996 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, 1997 filed with
                   the Commission on April 16, 1998 and  incorporated  herein by
                   reference.

                                       20
<PAGE>

5.1  Opinion of Severson & Werson, A Professional Corporation, as to the 
     legality of securities being registered.

23.1 Consent of KPMG Peat Marwick LLP, independent certified pubic accountants.

23.2 Consent of Ernst & Young LLP, auditors.

23.3 Consent of Counsel included in Exhibit 5.1.

24.1 Power of Attorney (contained in signature pages).

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  Statemen (or the most recent  post-effective
amendment  thereof)  which,  individually  or  in  the  aggregate,  represent  a
fundamental  change in the information set forth in the Registration  Statement.
Notwithstanding the foregoing,  any increase or decrease in volume of securities
offered (if the total dollar value of  securities  offered would not exceed that
which  was  registered)  and any  deviation  from  the  low or  high  end of the
estimated  maximum  offering  range may be reflected  in the form of  prospectus
filed with the  Commission  pursuant  to Rule 424(b) if, in the  aggregate,  the
changes in volume and price  represent  no more than a 20% change in the maximum
aggregate  offering price sete forth in the  "Calculation of  Registration  Fee"
table in the effective Registration Statement;

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

                                       21
<PAGE>

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.

     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. Undertaking In Respect Of Indemnification.

     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.

                                   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

                                       22
<PAGE>

Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of South San Francisco,  State of California,  on April
30, 1998.

                                IMATRON INC.

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















                                       23
<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/S. LEWIS MEYER       President, Chief Executive Officer        April 30, 1998
- ---------------------   and Director
S. Lewis Meyer

/s/DOUGLAS P. BOYD      Chairman of the Board                     April 30, 1998
- ---------------------
Douglas P. Boyd

/s/GARY H. BROOKS       Vice President Finance, Chief Financial   April 30, 1998
- ---------------------   Officer, and Chief Accounting Officer
Gary H. Brooks

/s/JOHN L. COUCH        Director                                  April 30, 1998
- ---------------------
John L. Couch

/s/TERRY ROSS           Director                                  April 30, 1998
- ---------------------
Terry Ross

/s/ALDO TEST            Director                                  April 30, 1998
- ---------------------
Aldo Test

/s/JOSE FILIPE GUEDES   Director                                  April 30, 1998
- ---------------------
Jose Filipe Guedes

/s/WILLIAM J. McDANIEL  Director                                  April 30, 1998
- ---------------------
William J. McDaniel


                                       24
<PAGE> 



                                  IMATRON INC.

                          INDEX TO EXHIBITS FILED WITH
                         FORM S-3 REGISTRATION STATEMENT

                        14,037,875 Shares of Common Stock


Sequential
Exhibit No. Description                                                Page No.

  4.7       Warrant Purchase Agreement between the Company and
            TeraRecon Inc. dated April 24, 1998                          26

  4.8       Common Stock Purchase Warrant which expires April 24,
            2002 issued to TeraRecon Inc.                                34

  5.1       Opinion of Counsel as to legality of securities being
            registered.                                                  40
 
 23.1       Consent of KPMG Peat Marwick LLP, independent certified
            public accountants.                                          42

 23.2       Consent of Ernst & Young LLP, auditors.                      43

 23.3       Consent of counsel inlcuded in Exhibit 5.1.

 24.1       Power of Attorney (contained in signature pages)





                                       25


                                  EXHIBIT 4.7

                       WARRANT PURCHASE AGREEMENT BETWEEN
               THE COMPANY AND TERARECON INC. DATED APRIL 24, 1998

         THIS WARRANT PURCHASE  AGREEMENT (the  "Agreement") is made and entered
into this 24th day of April,  1998 by and  between  IMATRON  INC.,  a New Jersey
corporation  (the  "Company") and TeraRecon  Inc., a Delaware  corporation  (the
"Investor").

                                R E C I T A L S:

     WHEREAS,  the  Company  desires to issue to Investor  and the  Investor
desires to  purchase  from the  Company a warrant  (the  "Warrant")  to purchase
1,000,000  shares of the Company's  common stock (the "Shares") all on the terms
and conditions  hereinafter  provided.  The Warrant and the Shares are hereafter
collectively referred to as the "Securities".

     NOW, THEREFORE, IT IS AGREED AS FOLLOWS:

     1. Issuance of Warrant. For good and valuable consideration the receipt
and sufficiency of which is  acknowledged by the Company,  the Company agrees to
issue to Investor the Warrant,  the form of which is attached  hereto as Exhibit
A.

     2. Investor Representations. Investor hereby represents and warrants to
the Company as follows:

          (a) The Investor  understands  that: (a) The offer and sale of
the  Securities  by the Company to Investor  has not been  registered  under the
Securities Act of 1933 (the "Securities  Act"), in reliance on an exemption from
such  registration   available  under  the  Securities  Act  and  rules  adopted
thereunder;  (b) The  Investor  must hold the  Warrant  indefinitely  unless the
Securities are  subsequently  registered  under the Securities Act and qualified
under  applicable  state  securities  laws,  or  unless an  exemption  from such
registration and qualification is available.

          (b) The Investor is acquiring  the  Securities  for his or her
own account, for investment,  and not with a view to any sale or distribution of
any interest therein.

          (c)  The  Investor  has  such   knowledge  and  experience  in
financial  and business  matters as to be capable of  evaluating  the merits and
risks of an investment in the  Securities,  and the Investor is able to bear the
economic risks of such an investment.

          (d) All statements  made, and  information  furnished,  by the
Investor in this certificate and all other information furnished by the Investor
to the Company, are true and complete, to the best of the Investor's knowledge.

                                       26
<PAGE>

     3. Restrictions on Transfer. The Investor agrees that:

          (a) The Investor  will not attempt to transfer the  Securities
in violation of the restrictions set forth in this Agreement.

          (b) The Company may note such  restrictions on transfer in its
records and refuse to recognize any transfer  which  violates this  agreement or
for which the Company has not received an acceptable  opinion of counsel stating
that such transfer will not violate such restrictions.

          (c)  One or more  legends  indicating  a lack of  registration
under the Securities Act and a lack of qualification under state securities laws
will be imprinted on the Securities. One such legend shall read substantially as
follows:

     THE  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.

     4. Binding on Successors; Indemnification. The Investor agrees that the
above  representations  and warranties are binding on the Investor's  successors
and assigns  and are made for the  benefit of the Company and any other  persons
who may become liable for  violations of federal or state  securities  laws as a
result of the falsity of any of the  Investor's  representations  or warranties.
The Investor  agrees to indemnify,  defend,  and hold harmless such persons from
any liability arising from the falsity of any of the Investor's  representations
or warranties or from the breach of any covenant of Investor contained herein.

     5.  Registration  Rights.  The Company  hereby  grants to Investor  the
following registration rights with respect to the Shares:

          (a)      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 this Section 5,  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).

                                       27
<PAGE>

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

          "Shares"  means  the  shares  of the  Company's  common  stock
exercisable  upon  exercise  of the  Warrant  and any common  stock  issued with
respect thereto (e.g. upon a stock split or stock dividend.

           "Investor" means the person set forth above and any permitted 
assignee.

          (b)      Company Registration.

               i)  Notice of  Registration.  If, at any time  after
the date  hereof,  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:

                    a) promptly give to Investor  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

                    b) include in such registration (and any 
related  qualification  under blue sky laws or other compliance), and in any
underwriting involved therein, all the Shares  specified  in a written  request
or  requests,  made by Investor  within fifteen (15) days after receipt of the
written notice from the Company described in this clause (i), except as set
forth in Section 5(b)(ii) below.

               ii) Underwriting.  If the registration of which the 
Company gives notice is for a registered public offering involving an
underwriting: the Company shall so advise  Investor as part of the written 
notice  given  pursuant to Section 5(b) hereof.  In such event,  the right of
Investor to registration  pursuant to this Section  5  shall  be  conditioned 
upon  Investor's   participation   in  such underwriting  and the inclusion of
Investor's  Shares in the underwriting to the extent provided herein. Investor
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  5,  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 which would otherwise be underwritten
pursuant hereto.  Any securities so excluded shall be apportioned pro rata among
Investor 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.

                                       28
<PAGE>

     If Investor  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 excluded or withdrawn from such  underwriting  shall be
withdrawn from such registration.

     The Company shall bear all Registration Expenses incurred in connection
with any  registration,  qualification and compliance by the Company pursuant to
this Section  5(b).  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.

               iii) Registration  Procedures.  In the case of 
registration effected by the Company  pursuant to this Agreement,  the Company
will keep Investor  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 year or until Investor 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 Investor from time to time may reasonably request; and

                    c) use its best  efforts  to  register  or  qualify  the  
Shares under the securities or blue sky laws of such  jurisdictions as Investor
may  request; provided, however, that the Company  shall not be obligated to
register or qualify such 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.

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

          (c)  Request  for  Registration.  In case  the  Company  shall
receive  from the  Investor  a  written  request  that the  Company  effect  any
registration,  qualification, or compliance with respect to all or a part of the
Shares the Company  will:  (i) as soon as  practicable,  use its  diligent  best
efforts  to  effect  all  such  registrations,  qualifications  and  compliances
(including,  without  limitations,  the  execution  of an  undertaking  to  file
post-effective amendments,  appropriate qualifications under the applicable blue
sky or other state  securities  laws and  appropriate  compliance with exemptive
regulations   issued  under  the  Securities  Act  and  any  other  governmental
requirements  or  regulations)  as may be so  requested  and as would  permit or
facilitate  the sale and  distribution  of all or such portion of the Investor's
Shares as are  specified in such  request,  together with all or such portion of
the Shares of any Holder or Holders  joining in such request as are specified in
a written  request given within thirty days after receipt of such written notice

                                       29
<PAGE>

from the Company;  provided  that the Company shall not be obligated to take any
action to effect such registration, qualification or compliance pursuant to this
subparagraph  5(c):  (A) After the Company has effected  two such  registrations
pursuant to this subparagraph 5(c) and such  registrations have been declared or
ordered effective;  or (B) If the amount of securities being offered for sale is
less than 25 percent of the Shares.

     Subject to the  foregoing  clauses (A) through (B),  the Company  shall
file a registration  statement covering the Shares so requested to be registered
as soon as practical,  but in any event within ninety days, after receipt of the
request or  requests of the  Investor;  provided,  however,  that if the Company
shall  furnish to such  Investor a  certificate  signed by the  President of the
Company  stating  that in the good faith  judgment of the Board of  Directors it
would be  seriously  detrimental  to the  Company and it  stockholders  for such
registration  statement  to be filed at the date filing would be required and it
is therefore essential to defer the filing of such registration  statement,  the
Company  shall have an  additional  period of not more than  ninety  days within
which to file such registration statement.

     The Investor shall bear all  Registration  Expenses  incurred in connection
with any  registration,  qualification and compliance by the Company pursuant to
this Section  5(c).  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.

          (d)      Indemnification.

               i) The Company will indemnify the Investor, each of its officers,
directors and partners,  and each person  controlling  such Investor  within the
meaning of Section 15 of the  Securities  Act or the 1934 Act,  with  respect to
which  registration,  qualification or compliance has been effected  pursuant to
this Agreement,  and each underwriter,  if any, and each person who controls any
underwriter  within the meaning of Section 15 of the  Securities Act or the 1934
Act, against all expenses, claims, losses, damages or liabilities (or actions in
respect thereof),  including any of the foregoing  incurred in settlement of any
litigation,  commenced  or  threatened,  arising  out of or based on any  untrue
statement (or alleged  untrue  statement)  of a material  fact  contained in any
registration statement,  prospectus, offering circular or other document, or any
amendment or supplement thereto, incident to ny such registration, qualification
or compliance, or based on any omission (or alleged omission) to state therein a
material fact required to be stated  therein or necessary to make the statements
therein,  in the  light  of the  circumstances  in which  they  were  made,  not
misleading,  or any violation by the Company of the Securities  Act, or the 1934
Act, or any rule or regulation promulgated under the Securities Act, or the 1934
Act, or under any state  securities  law or under common law,  applicable to the
Company in connection with any such  registration,  qualification or compliance,
and the Company will reimburse the Investor, each of its officers, directors and
partners,  and each person  controlling the Investor,  each such underwriter and
each  person  who  controls  any such  underwriter,  for any legal and any other
expenses reasonably incurred,  as such expenses are incurred, in connection with
investigating, preparing or defending any such claim, loss, damage, liability or
action;  provided,  however, that the Company will not be liable (i) for amounts
paid in settlement of any such loss, claim, damage,  liability or action if such
settlement is effected  without the consent of the Company  (which consent shall
not be  unreasonably  withheld) and (ii) in any such case to the extent that any
such claim, loss, damage,  liability or expense arises out of or is based on any

                                       30
<PAGE>

untrue  statement or omission or alleged untrue  statement or omission,  made in
reliance  upon and in  conformity  with  written  information  furnished  to the
Company by an instrument  duly executed by the Investor,  controlling  person or
underwriter and stated to be specifically for use therein.

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

               iii) Each party  entitled to  indemnification  under this Section
5(d)(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  litigation,  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,  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 Agreement  except to the extent that the failure to
give such notice is materially prejudicial to an Indemnifying Party's ability to
defend such action and provided further,  that the Indemnifying  Party shall not
assume the  defense  for  matters as to which there is a conflict of interest or
separate  and  different  defenses,  but shall pay the fees and  expenses of one
separate counsel retained by the Indemnified Party in the event of such conflict
of  interest.  No  Indemnifying  Party,  in the  defense  of any  such  claim or
litigation, shall, except with the consent of each 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.

                                       31
<PAGE>

               iv) If the  indemnification  provided for in this Section 5(d) is
held by a court of competent  jurisdiction  to be  unavailable to an indemnified
party with respect to any loss, liability, claim, damage, or expense referred to
therein,  then the Indemnifying  Party, in lieu of indemnifying such Indemnified
Party  hereunder,  shall  contribute  to the  amount  paid  or  payable  by such
Indemnified Party as a result of such loss, liability, claim, damage, or expense
in such  proportion  as is  appropriate  to reflect  the  relative  fault of the
Indemnifying  Party on the one hand and of the Indemnified Party on the other in
connection  with  the  statements  or  omissions  that  resulted  in such  loss,
liability,  claim,  damage,  or expense as well as any other relevant  equitable
considerations.  The  relative  fault  of  the  Indemnifying  Party  and  of the
Indemnified  Party shall be  determined  by reference  to,  among other  things,
whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission  to state a  material  fact  relates  to  information  supplied  by the
indemnifying party or by the indemnified party and the parties' relative intent,
knowledge,  access to  information,  and  opportunity to correct or prevent such
statement or omission.

               v) The  obligations  of the Company and the  Investor  under this
Section  5(d)  shall  survive  the  completion  of any  offering  of Shares in a
registration statement under this Section 5 and otherwise.

               vi)  Information by Investor.  The Investor of Shares included in
any  registration  shall  furnish  to the  Company  such  information  regarding
Investor,  the Shares held by it and the distribution  proposed by such Investor
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.

               vii)  Transfer of  Registration  Rights.  The rights to cause the
Company to register  securities  granted Holders under Section 5 may be assigned
to a transferee  or assignee in  connection  with any transfer or  assignment of
Shares by a Holder provided that: (i) such transfer may otherwise be effected in
accordance with applicable  securities laws and (ii) such assignee or transferee
becomes a party to this  Agreement  and  assumes all of the  obligations  of the
transferring Holder under Section 5.

     6. Rule 144 Reporting.  With a view to making available the benefits of
certain rules and regulations of the Commission which may at any time permit the
sale of the Shares to the public without registration, Imatron agrees to use its
best efforts to:

          (a) Make and keep  public  information  available,  as those terms are
understood and defined in Rule 144 under the Securities  Act, at all times after
the effective date that Imatron becomes subject to the reporting requirements of
the Securities Act or the Securities Exchange Act of 1934, as amended.

          (b) File with the  Commission in a timely manner all reports and other
documents  required  of  Imatron  under the  Securities  Act and the  Securities
Exchange  Act of 1934,  as amended  (at any time after it has become  subject to
such reporting requirements); and

          (c) So long as Investor  owns any Shares,  to furnish to the Purchaser
forthwith upon request a written  statement by Imatron as to its compliance with
the reporting  requirements of said Rule 144 (at any time after ninety (90) days

                                       32
<PAGE>

after the effective date of the first  registration  statement  filed by Imatron
for an offering of its securities to the general public),  and of the Securities
Act and the  Securities  Exchange  Act of 1934 (at any time  after it has become
subject to such  reporting  requirements),  a copy of the most recent  annual or
quarterly report of the Company, and such other reports and documents of Imatron
and other  information in the possession of or reasonably  obtainable by Imatron
as a  Shareholder  may  reasonably  request  in  availing  itself of any rule or
regulation of the Commission  allowing a Shareholder to sell any such securities
without registration.

     7.  Governing  Law.  This  Agreement  shall be governed by and construed in
accordance with the laws of the State of California.

     8.  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 as of the day and year first above written.

                                    COMPANY:

                                         IMATRON INC.

                                         By:
                                            President


                                    INVESTOR:

                                         TERARECON INC.

                                         By:
                                         Its:




                                       33



                                   EXHIBIT 4.8

                       COMMON STOCK PURCHASE WARRANT WHICH
                 EXPIRES APRIL 24, 2002 ISSUED TO TERARECON INC.


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 April 24, 2002

                      Warrant No. 98-TR1 Shares: 1,000,000

     THIS CERTIFIES that,  subject to the terms and conditions herein set forth,
TeraRecon  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 Four Dollars and Fifty Cents ($4.50) per share. The purchase
price of one share of Common Stock is referred to herein as the "Warrant Price".

     2. Exercise Period. The exercise Period shall mean the period commencing on
the date hereof and ending four years thereafter.

     3. 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:

                                       34
<PAGE>

          (a)  Adjustment  of Warrant  Price and Number of Shares.  The  Warrant
Price and the number of shares  purchasable  upon the  exercise of this  Warrant
shall be subject to adjustment  from time to time upon the occurrence of certain
events  described in this Section 3. Upon each  adjustment of the Warrant Price,
the Holder of this Warrant  shall  thereafter  be entitled to  purchase,  at the
Warrant Price resulting from such  adjustment,  the number of shares obtained by
multiplying the Warrant Price in effect  immediately prior to such adjustment by
the  number of shares  purchasable  pursuant  hereto  immediately  prior to such
adjustment, and dividing the product thereof by the Warrant Price resulting from
such adjustment. In case the Company shall at any time subdivide its outstanding
shares of Common  Stock into a greater  number of shares,  the Warrant  Price in
effect immediately prior to such subdivision shall be  proportionately  reduced,
and conversely,  in case the  outstanding  shares of Common Stock of the Company
shall be combined into a smaller  number of shares,  the Warrant Price in effect
immediately prior to such combination shall be proportionately increased.

          (b)  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)
herein),  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 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  3. The Company  shall give the Holder
thirty (30) days advance written notice of of any dividend causing an adjustment
pursuant to this subsection.

          (c)  Adjustment  for Changes in Common Stock.  In the event 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,
are  effected  in such a way that  holders of Common  Stock shall be entitled to
receive stock,  securities,  or other assets or property (an "Organic  Change"),
then,  as a condition of such  Organic  Change,  lawful and adequate  provisions
shall be made by the Company whereby the Holder hereof shall thereafter have the
right to purchase  and receive (in lieu of the shares of the Common Stock of the
Company  immediately  therefore  purchasable and receivable upon the exercise of
the rights represented hereby) such shares of stock,  securities or other assets
or property  as may be issued or payable  with  respect to or in exchange  for a
number of outstanding  shares of such Common Stock equal to the number of shares
of such  stock  immediately  theretofore  purchasable  and  receivable  upon the
exercise of the rights represented hereby; provided,  however, that in the event
the value of the stock,  securities or other assets or property  (determined  in
good faith by the Board of Directors  of the  Company)  issuable or payable with
respect to one share of the Common Stock of the Company immediately  theretofore
purchasable and receivable upon the exercise of the rights represented hereby is
in excess of the  Warrant  Price  hereof  effective  at the time of a merger and
securities  received in such  reorganization,  if any, are publicly traded, then

                                       35
<PAGE>

this Warrant shall expire unless exercised prior to such Organic Change.  In the
event of any Organic Change,  appropriate provision shall be made by the Company
with  respect to the rights and  interests  of the Holder of this Warrant to the
end that the provisions hereof (including,  without  limitation,  provisions for
adjustments  of the Warrant  Price and of the number of shares  purchasable  and
receivable upon the exercise of this Warrant) shall thereafter be applicable, in
relation to any shares of stock,  securities  or assets  thereafter  deliverable
upon the exercise hereof.

          (d) Certain Events.  If any change in the outstanding  Common Stock of
the Company or any other event occurs as to which the other  provisions  of this
Section 3 are not strictly applicable or if strictly applicable would not fairly
protect the purchase rights of the Holder of the Warrant in accordance with such
provisions,  then the Board of Directors of the Company shall make an adjustment
in the number and class of shares available under the Warrant, the Warrant Price
or the application of such provisions,  so as to protect such purchase rights as
aforesaid.  The adjustment  shall be such as will give the Holder of the Warrant
upon 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.

     4. 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 by
the average of the closing or last reported  sale prices on the NASDAQ  National
Market  over  the  5-day  period  ending  five  days  prior  to the time of such
exercise.

     5. 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.

     6.  Representations,  Warranties and Covenants.  This Warrant is issued and
delivered  by the  Company  and  accepted  by each  Holder  on the  basis of the
following representations, warranties and covenants made by the Company:

          (a) The  Company has all  necessary  authority  to issue,  execute and
deliver this Warrant and to perform its obligations hereunder.  This Warrant has
been duly authorized,  issued,  executed and delivered by the Company and is the
valid and binding obligation of the Company,  enforceable in accordance with its
terms.

          (b) The share of the Common Stock  issuable  upon the exercise of this
Warrant have been duly  authorized and reserved for issuance by the Company and,
when issued in accordance with the terms hereof,  will be validly issued,  fully
paid and  nonassessable.  The Company  further  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.

                                       36
<PAGE>

          (c) The  issuance,  execution and delivery of this Warrant do not, and
the  issuance of the share of Common  Stock upon the exercise of this Warrant in
accordance  with the terms  hereof  will not,  (i)  violate  or  contravene  the
Company's Articles or by-laws, or any law, statute,  regulation,  rule, judgment
or order  applicable  to the Company,  (ii)  violate,  contravene or result in a
breach or default under any material contract,  agreement or instrument to which
the  Company is a party or by which the  Company or any of its assets are bound,
or (iii)  require  the  consent  of  approval  of or the filing of any notice or
registration  with any person or entity except for the filing of notice pursuant
to federal and state securities laws which, if required,  the Company  covenants
and agrees to file within the prescribed period.

          (d) 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  certificate for
shares of Common Stock upon the exercise of this Warrant.

     7.  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
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.

     8.  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.

     9.  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.

                                       37
<PAGE>

     10.   Registration   Rights.   The  Company  grants  to  the  Holder  those
registration rights contained in that certain Warrant Purchase Agreement of even
date herewith between the Company and the Holder.

     11. 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.

     12. 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.

     13. No  Impairment.  The Company  will not, by amendment of its Articles or
through any reclassification,  capital  reorganization,  consolidation,  merger,
sale  or  conveyance  of  assets,  dissolution,  liquidation,  issue  or sale of
securities or any other voluntary action,  avoid or seek to avoid the observance
or  performance  of any of the terms of this  Warrant,  but will at all times in
good faith assist in the carrying out of all such terms and in the taking of all
such action as may be necessary or appropriate in order to protect the rights of
the Holder.

     14.  Successors  and  Assigns.  This  Warrant  shall  be  binding  upon the
Company's  successors and assigns and shall inure to the benefit of the Holder's
successors, legal representatives and permitted assigns.

     15. 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.

                                       38
<PAGE>

ISSUED this 24th day of April, 1998.


ATTEST:                                  IMATRON INC.


                                         By
- ---------------------------                -------------------------------
                                               S. Lewis Meyer, President

















                                       39



                                   EXHIBIT 5.1

       OPINION OF COUNSEL AS TO LEGALITY OF SECURITIES BEING REGISTERED.

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

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

                                 May 4, 1998



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  15,037,875  shares  of  the  Company's  Common  Stock  (the
"Shares").  Such total includes 36,868 shares  currently issued and outstanding;
4,334,340  shares which are issuable upon the exercise of outstanding  warrants;
and 10,666,667 shares which are issuable upon the exercise of outstanding Common
Stock  exchange  rights.  All of the  outstanding  shares,  the warrants and the
exchange  rights  were   previously   issued  by  the  Company  to  the  Selling
Shareholders in 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.

                                       40
<PAGE>

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

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

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

     We consent to the filing of this opinion as an exhibit to the  Registration
Statement.
                                      SEVERSON & WERSON
                                      A Professional Corporation


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










                                       41


                                  EXHIBIT 23.1

             CONSENT OF KPMG PEAT MARWICK LLP, INDEPENDENT CERTIFIED
                               PUBLIC ACCOUNTANTS

                             The Board of Directors
                                  Imatron Inc.

We  consent  to the use of our  report  dated  April  6,  1998  relating  to the
consolidated  balance  sheet of Imatron Inc. and  subsidiary  as of December 31,
1997 and the related consolidated statements of operations, shareholders' equity
and cash  flows for the year  then  ended and the  related  financial  statement
schedule incorporated herein by reference and to the reference to our firm under
the heading "Experts" in the prospectus.

                                /s/ KPMG Peat Marwick LLP
                                -------------------------
                                    KPMG Peat Marwick LLP

San Francisco, California
May 4, 1998


















                                       42

                                  Exhibit 23.2

               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 15,037,875  shares of its common stock and to the  incorporation
by reference therein of our report dated, February 14, 1997, except for Note 12,
as to which date is April 10, 1998 with  respect to the  consolidated  financial
statements of Imatron Inc. as of December 31, 1996 and for each of the two years
in the period ended December 31, 1996 included in its Annual Report(Form 10-K/A)
for the year ended  December 31, 1997,  filed with the  Securities  and Exchange
Commission.

                                          /s/ Ernst & Young LLP
                                          ---------------------
                                              Ernst & Young LLP

May 5, 1998













                                       43



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