IMATRON INC
S-3, 1999-09-16
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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   As filed with the Securities and Exchange Commission on September 16, 1999
                         Registration No. 333-_________

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

                       SECURITIES AND EXCHANGE COMMISSION

                                    FORM S-3

             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.

     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: ( )


                         CALCULATION OF REGISTRATION FEE

================================================================================
<TABLE>
<S>                        <C>                     <C>                      <C>                      <C>

Title of Each  Class of    Amount                  Proposed Maximum          Proposed Maximum         Amount of
Securities to Be           to Be                   Offering Price            Aggregate                Registration
Registered                 Registered              Per Share(1)              Offering Price(1)        Fee
- ----------                 -------------           ---------------           ------------------       -------------

Common Stock               12,439,858 Shares       $1.16                        $14,430,235              $4012

</TABLE>

(1)      Estimated  solely for the purpose of  computing  the  registration  fee
         required by Section 6(b) of the Securities Act and computed pursuant to
         Rule 457(c) under the Securities Act based upon the average of the high
         and low prices of  Imatron's  common stock on  September  15, 1999,  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.

<PAGE>


     The information in this  prospectus is not complete and may be changed.  We
may not sell theses  securities until the registration  statement filed with the
Securities and Exchange Commission becomes effective.  This prospectus is not an
offer to sell these  securities,  and it is not soliciting an offer to buy these
securities in any state where the offer or sale is not permitted.

                 SUBJECT TO COMPLETION, DATED SEPTEMBER 16, 1999

                                   PROSPECTUS

                                12,439,858 Shares

                                  IMATRON INC.

                           Common Stock, No Par Value

     This  prospectus  relates to the sale of 12,439,858  shares of Imatron Inc.
common  stock  by  certain  selling  shareholders  listed  on  page  14 of  this
prospectus.  7,743,226 shares are currently issued and outstanding and 4,696,632
shares are  issuable  upon the  exercise  of  outstanding  warrants.  All of the
outstanding  shares and the warrants  were  previously  issued by Imatron to the
selling  shareholders in private  transactions.  The outstanding  shares and the
warrant shares are collectively  referred to in this prospectus as the "Shares."
The  selling  stockholders  intend to sell the Shares  from time to time in open
market and/or private sales, or by any other appropriate  method.  The prices at
which the selling  stockholders  may sell the Shares will be  determined  by the
prevailing market price for the Shares or in negotiated transactions.

     We will receive  proceeds  upon the exercise of the warrants by the selling
stockholders  but  will not  receive  any of the  proceeds  from the sale of the
Shares.  We have  agreed  to bear all of the  expenses  in  connection  with the
registration (but not the sale) of the Shares.

     Our common stock is traded on the Nasdaq  National  Market under the symbol
"IMAT." On  September  15,  1999,  the last sale  price of our common  stock was
$1.125 per share.  References in this  prospectus  to "Imatron,"  "we," "us" and
"our" refer to Imatron Inc., a New Jersey corporation.

     These shares offered in this prospectus  involve a high degree of risk. See
"Risk Factors" beginning on page 4.

     Neither the  Securities and Exchange  Commission  nor any state  securities
commission has approved or  disapproved  of these  securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.

                  The date of this prospectus is ________, 1999

<PAGE>


                                TABLE OF CONTENTS

DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS...............................3

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

RISK FACTORS..................................................................4

USE OF PROCEEDS..............................................................13

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

SELLING STOCKHOLDERS.........................................................13

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

EXPERTS......................................................................16

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

AVAILABLE INFORMATION........................................................16

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE............................16





<PAGE>



                 DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

     Certain of the matters  discussed in this  prospectus or in the information
incorporated by reference  herein may contain  forward-looking  statements.  The
forward-looking  statements  in this  prospectus  reflect our 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,"  "plans," "expects,"  "intends," "future" and
similar  expressions  identify  such  forward-looking  statements.  Readers  are
cautioned to consider the specific risk factors described in "Risk Factors," and
not to place undue reliance on the forward-looking  statements contained herein,
which apply only as of the date of this  prospectus.  We undertake 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 Imatron or persons acting on its
behalf are expressly qualified in their entirety by this section.

                                   THE COMPANY

     Imatron  Inc.,  a  New  Jersey  corporation  incorporated  in  1983,  is  a
technology-based  company  principally  engaged in the  business  of  designing,
manufacturing  and  marketing  a high  performance  computed  tomography  ("CT")
scanner.  This scanner uses Electron Beam Tomography ("EBT") technology based on
a scanning  electron beam. The scanner is in use at approximately  107 large and
midsize  hospitals and free-standing  imaging clinics.  In addition to providing
service,  parts and  maintenance  to  hospitals  and  clinics  that  operate its
scanners,  Imatron also offers its service capability to other  manufacturers of
high tech medical equipment.

     The Imatron EBT scanner design differs  significantly  from conventional CT
scanners in two important  ways.  First,  the  mechanically  rotating x-ray tube
technology of  conventional CT scanners is replaced by a high power electron gun
that  generates a focused,  high-intensity  electron beam which is steered along
stationary x-ray target rings to produce a rotating  fan-shaped x-ray beam. This
patented electron beam technology permits  significantly faster scanning speeds.
Our scanner can acquire CT images at a scan speed of 50 to 100  milliseconds per
slice,  in contrast to  conventional  CT scanners that require between 0.5 and 3
seconds per slice to acquire an image.  Second,  our EBT scanner  permits  rapid
scanning  of  multiple  contiguous  images  without  moving the  patient.  These
features allow the EBT scanner to perform  stop-action or dynamic studies of the
heart and various other organs,  contributing  to the scanner's  usefulness  for
both diagnostic imaging and functional evaluation.

     In December  1998,  we  completed  our version 12.4  software  development.
Software  12.4 brings the  Ultrafast  C-150XP and  C-150LXP  into full year 2000
compliance,  using four digits for all dates.  The new software version also has
algorithmic improvements which affect image quality, allowing improved images of
the head,  chest,  and abdomen,  especially with the high  resolution  detector.
Software 12.4 was  thoroughly  tested in late 1998, and was released for general
use in January 1999 and will be provided at no charge to all hardware compatible
systems.

     In March 1998,  we developed  and released for sale to our  customers,  the
High Resolution  Detector System for our Ultrafast CT scanners.  This new system
increased  the spatial  resolution  of the single  slice mode from 7 to 9.5 line
pairs per  centimeter  and the  multi-slice  mode from 3 to 4.50 line  pairs per
centimeter. The increased spatial resolution improved the scanner's performance,
especially  in  neurological,  pulmonary,  and abdominal  applications.  It also
increased the total number of detector  channels  from 1,296 to 3,456,  improved
image data correction during reconstruction, and enhanced overall image quality.

     In November 1997, we received 510(K) market clearance from the Federal Food
and Drug  Administration  ("FDA") for our new 3456 Channel  Dual Slice  Detector
Array C-150 Ultrafast CT scanner.

     HeartScan Imaging, Inc. ("HeartScan"), incorporated in Delaware in 1993, is
a diagnostic  services  subsidiary of Imatron.  HeartScan offers coronary artery
scanning and Coronary  Artery Disease risk assessment  services  through its two
centers located in Houston,  Texas and Washington,  D.C. In July 1996, HeartScan
completed a private placement that raised  $14,798,000 in net proceeds.  On July
13, 1998, we adopted a formal plan to sell the HeartScan subsidiary in order for
us to focus more  comprehensively  on our core  business of selling,  marketing,
manufacturing and servicing our proprietary Ultrafast CT scanners. Currently, we
have a 94.3% interest in HeartScan,  which Imatron has reflected as discontinued
operations for all periods  presented in our statements of operations and as net
assets of  discontinued  operations  in the  December  31, 1998 and 1997 balance
sheets.  Effective  March 1, 1999 we sold the HeartScan - San Francisco  center,
and on June 11,  1999,  we sold the  Pittsburgh,  Pennsylvania  center.  We have
entered  into a letter of intent to sell the two  remaining  centers in Houston,
Texas, and Washington, D.C.

                                  RISK FACTORS

     The securities  offered in this  prospectus are  speculative  and involve a
high degree of risk. You should  carefully  consider the risks  described  below
before making a decision to buy our common stock.  The risks described below are
not the only ones we face. Additional risks not presently known to us or that we
currently   consider   immaterial  may  also  materially   impair  our  business
operations.  If  any  of the  following  risks  actually  occur,  our  business,
financial  condition  or  results of  operation  could be  materially  adversely
affected. In such case, the trading price of our common stock could decline, and
you may lose all or a part of your investment.

We have a history of losses and we are uncertain as to our future profitability.

     Imatron was  incorporated in February,  1983 and in April,  1983 became the
successor to Imatron Associates,  a limited partnership established in February,
1981. We operated as a  development-stage  company  until the fourth  quarter of
1984,  at which  time we  recognized  our  initial  sale of an EBT  scanner.  We
incurred losses each quarter from inception through December 31, 1990. Our 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. We 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 of HeartScan. In
1998,  1997, and 1996, we incurred net losses of $14,781,000,  $11,422,000,  and
$13,737,000,  respectively.  The  net  losses  are  partially  a  result  of the
operating losses incurred by discontinued operations of HeartScan which amounted
to $4,507,000,  $6,428,000, and $4,573,000 in the years ended December 31, 1998,
1997, and 1996,  respectively.  The net losses  incurred by the Company  reflect
non-cash  minority  interest  expense of  $874,000,  $1,744,000  and  $3,272,000
recorded in 1998,  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 we can return to
profitable operations in the future.

     In the past,  we have  funded  our  losses  primarily  through  the sale of
securities in public offerings and a number of private  placements,  through the
exercise of options and  warrants,  through the 1991 license for medical uses of
our electron-beam technology to Siemens Corporation, and through revolving lines
of  credit.  In 1995,  we  raised  $9,882,000  (net of  offering  costs)  in two
offerings  of common  stock to  certain  institutional  investors.  In 1996,  we
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,  we
raised  $14,798,000  (net of  offering  costs)  to use  exclusively  to  develop
HeartScan operations. As of December 31, 1998, we had a consolidated accumulated
deficit of $97,497,000.  Year to date, we have completed two private  placements
raising a total of $6,000,000.

     Our 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
existing at December 31, 1998 together with the estimated  proceeds from ongoing
sales of products and services and  divestiture  of the HeartScan  operations in
1999 will provide us with sufficient  cash for operating  activities and capital
requirements through December 31, 1999.

We may need additional financing.  Future financing could have a dilutive effect
on our stockholders.

     To satisfy our capital and operating requirements, profitable operations or
additional  public  or  private  financing  or the  incurrence  of  debt  may be
required.  We cannot assure that additional funding will be available to finance
our ongoing  operations  when needed or that adequate funds for our  operations,
whether  from  financial  markets,  collaborative  or  other  arrangements  with
corporate  partners or from other sources,  will be available when needed, if at
all, or on terms  attractive to us. This could have a material adverse effect on
our business, financial condition and results of operations.

     If we  require  future  public or  private  financing,  holders  of Imatron
securities may experience  dilution.  We cannot make  assurances  that equity or
debt sources, if required, will be available or, if available,  will be on terms
favorable to Imatron or our  stockholders.  We do not believe that inflation has
had a material effect on our revenues or results of operations.

If we  lose  any of our  executive  or  key  personnel  our  business  could  be
materially adversely affected.

     We have  been  and  will  continue  to be  materially  dependent  upon  the
technical  expertise of our engineering  management  personnel and the continued
services of our senior management. The loss of a significant number of these key
employees  could  have a material  adverse  effect on our  business,  results of
operation  and  financial  condition.  We do  not  maintain  "key  person"  life
insurance for any of our personnel.

     On August 31, 1999 Gary H. Brooks, Vice President,  Chief Financial Officer
and Secretary  resigned.  Mr. Brooks resigned to serve full time as president of
Positron  Corporation,  a  manufacturer  of  advanced  medical  imaging  devices
utilizing positron emission  tomography in which Imatron has a 17% fully-diluted
interest.  We do not believe loss of Mr.  Brooks will have an adverse  effect on
our operations. We are conducting a search for Mr. Brooks' replacement.

The cost of our scanner is high, which can limit the market for our product.

     The  list  price  of our  Ultrafast  CT  scanner  is  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 our product.
Potential   customers'  budgetary   limitations,   including  those  imposed  by
government regulation, may often compel the purchase of lower cost, conventional
CT scanners.

There is limited clinical demonstration of the advantages of our scanner.

     Our 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.  One hundred and seven (107)
C-150, C-100 and C-150L scanners are currently  installed in a clinical setting.
We believe  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  advantages and diagnostic capabilities will result
in the development of a significant  market for the Ultrafast CT that will allow
us to operate profitably.

Health care providers may not receive reimbursement for the cost of CT scans.

     FDA  clearance  to market  does not  guarantee  or imply  reimbursement  by
third-party payers such as Medicare,  Medicaid,  Blue Cross/Blue Shield or other
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.  If health care providers to not received reimbursement for the costs
of CT scans our sales could be adversely affected.

     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.  These
limitations  have led to a reduction in, and may further  limit funds  available
for, the purchase of diagnostic  equipment such as our scanner and in the number
of  diagnostic  imaging  procedures  performed  in hospitals  and other  medical
institutions such as imaging clinics.

     Some states have adopted  requirements that hospitals and other health care
facilities,  such as imaging  clinics,  obtain a  Certificate  of Need 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  legislation  such as  requiring  private
physicians  to obtain a  Certificate  of Need for any CT scanner,  regardless of
cost.  We cannot  assure  that our  potential  customers  will be able to secure
Certificates of Need or will be willing to pursue the application procedure.

The manufacture and sale of scanners subjects us to product liability risks.

     As a  manufacturer  and marketer of medical  diagnostic  equipment,  we are
subject to  potential  product  liability  claims.  HeartScan is also subject to
potential  liability claims as a supplier of radiological  diagnostic  services.
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  Imatron to possible liability claims. We presently maintain
primary and excess product  liability  insurance  with aggregate  limits of $5.0
million per occurrence.  We cannot assure that our product  liability  insurance
coverage will continue to be available or, if available, that it can be obtained
in sufficient amounts or at reasonable costs or that it will prove sufficient to
pay any claims that may arise.

If we are unable to protect our patents and  proprietary  technology we will not
be able to compete effectively.

     We rely heavily on proprietary  technology and intellectual  property which
we attempt to protect  through  patents and trade secrets.  In February 1981, we
were  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 Imatron,
and  a  sublicense   agreement  between  Emersub  and  Imatron  Associates  (our
predecessor), respectively.

     Under the continuing sublicense agreement,  as amended, we make payments to
Emersub  equal to 2.125% of net sales of certain  patented  products.  Imatron'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 our business and future prospects.

     UC cancelled  the license to Emersub on October 8, 1997.  We have agreed to
pay UC  royalties  in the amount of $174,515  for  scanners  sold from that date
through December 31, 1998. UC has agreed to grant us a license for the remaining
life of the  patent  on  substantially  the same  terms as the  Emersub  license
agreement.  Royalty expense related to the sublicense  agreement for 1998, 1997,
and 1996 were  $137,775,  $165,330,  and $91,470,  respectively.  Development of
portions of the technology  covered by the UC patent and  sublicensed to Imatron
has been funded in substantial part through research financing made available to
UC by the National  Institutes of Health.  As a result of such financing,  it is
possible that the U.S.  Government may assert certain claims in such UC patents,
including the right to a royalty-free license for governmental use.

     In  addition,  we hold  thirty-three  U.S.  Patents of our own (each with a
remaining  life in  excess  of one  year)  and  have  filed  three  U.S.  patent
applications  covering  various  integral  components of the scanner  including,
among others, our electron beam assembly and our x-ray detector,  and have filed
applications  corresponding  to several of these  patents  and  applications  in
various  European  Patent  Convention  countries,  Canada,  and Japan. We cannot
assure that any such  applications  will  result in the  issuance of a patent to
Imatron.  Our patents and patent applications have not been tested in litigation
and we  cannot  assure  that  patent  protection  will be  upheld  or will be as
extensive as we claim. Furthermore, we cannot assure that we are able to finance
litigation  against parties which may infringe upon our patents or parties which
may claim that our scanner infringes upon their patents.  However, the agreement
we signed with Siemens  Corporation in March 1991 allows Siemens  Corporation to
enter into litigation in favor of Imatron.

     On March 31,  1995,  Imatron  and  Siemens  entered  into a  Memorandum  of
Understanding transferring five patents to Siemens, in complete consideration of
the cancellation by Siemens of $4.0 million notes payable from Imatron.  As part
of the agreement, Siemens granted to us 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 (or other EBT unit produced by Imatron after April 1, 1995),
commencing  with the 21st C-150 (or other Imatron EBT) unit produced in any year
and  continuing  thereafter for ten years after such first quarter in which such
21st unit is produced.  To date,  Imatron has not produced more than 20 scanners
in any year and, therefore, no royalties have been due under this agreement.

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

     We also  believe  that  many of our  proprietary  technologies  are  better
protected as trade secrets or  copyrights  than by patents.  Moreover,  although
protection of our existing proprietary technologies is important,  other factors
such as product  development,  customer support,  and marketing ability are also
important to the development of our business.

We have a limited source of supply which can delay our production schedule.

     We  manufacture  our scanner at our  headquarters  in South San  Francisco,
California.  To date, the typical manufacturing cycle has required approximately
six months from the authorization of manufacturing to the delivery of a scanner.

     Many of the  components  and  sub-assemblies  used in the scanner have been
developed  and designed by us to our 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 delivery. Delays in such delivery could adversely affect
our present and future production  schedules.  We have made and continue to make
inventory investments to acquire long lead time components and sub-assemblies to
minimize  the  impact  of such  delays.  In  recent  years,  we  have  developed
alternative  sources  for many of our scanner  subcomponents  and  continue  our
programs to qualify vendors for the remaining critical parts.

     Also,  certain vendors  currently  require  cash-on-delivery  or prepayment
terms.  We cannot  assure  that  such  actions  will not  adversely  affect  our
production schedule and our ability to deliver products in a timely manner. As a
result of certain vendors  currently  requiring  cash-on-delivery  or prepayment
terms,  we must  maintain  higher  levels of cash and other sources of credit to
fund material purchases than otherwise would be required.

If we fail to comply with federal and state laws  regulating  our  industry,  we
could be  subject  to  penalties,  disqualifications,  lawsuits  or  enforcement
actions that could have a material adverse affect on our business.

     Amendments to the Federal Food, Drug, and Cosmetic Act enacted in 1976, and
regulations issued or authorized  thereunder,  provide for regulation by the FDA
of the marketing,  manufacture,  labeling,  packaging,  sale and distribution of
"medical   devices,"   including  our  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 regulations.  The
FDA enforces additional  regulations regarding the safety of equipment utilizing
x-rays, including CT scanners. Various states also impose similar regulations.

     The laws 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 may be required. This process is potentially expensive and
time consuming and must be completed prior to marketing a new medical device. We
have received  appropriate  clearances from the FDA to market both the C-100 and
C-150  ULTRAFAST  CT scanner.  We believe that we are  presently in  substantial
compliance  with  the  Good  Manufacturing   Practice   requirements  and  other
regulatory issues promulgated by the FDA.

     The FDA also  regulates  the safety and efficacy of  radiological  devices.
Although we believe that we are in compliance  with all applicable  radiological
health  regulations  promulgated by the FDA, we cannot assure 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  material  adverse effect upon the
development of our business and our future profitability.

     Our primary customers operate in the highly regulated  healthcare industry.
Both existing and future  governmental  regulations  could adversely  impact the
market for our ULTRAFAST CT scanner and our business.  Our  operations  are also
subject to regulation by other federal,  state and local  governmental  entities
empowered to enforce pertinent statutes and regulations,  such as those enforced
by the Occupational  Safety and Health Agency and the  Environmental  Protection
Agency.  In  some  cases,  state  or  local  regulations  may be  stricter  than
regulations imposed by the federal  government.  We were 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 which
were immediately corrected. The subsequent follow up inspection in December 1993
by the same regulatory body yielded satisfactory results without the issuance of
further notice of violation.  We believe that we are in  substantial  compliance
with California regulations applicable to our business.

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

     On May 4, 1999,  we  received  a Warning  Letter  from the FDA.  The letter
alleges that a certain  number of our corporate  and  marketing  communications,
including part of our Website,  contain  statements about the use of our scanner
that go beyond  intended  use for which the scanner  has been  cleared and that,
therefore,  our scanner is misbranded  with regard to such use under  applicable
law. While we disagree with the FDA's allegations,  and are diligently  pursuing
the matter with the FDA, we, nevertheless, have modified our Website in response
to the FDA's position. It is our intention to make future corporate or marketing
statements which will be consistent with the FDA  interpretation  of the law. We
do not believe this change in our communications practices will adversely impact
our ability to market and sell our scanners.

     Our failure to comply with applicable regulatory requirements can result in
enforcement actions by the FDA, including, but not limited to:

     o fines;

     o injunctions;

     o recall or seizure of products;

     o withdrawal of marketing approvals or clearances;

     o refusal of the FDA to grant clearances or approvals; and

     o civil or criminal penalties.

     HeartScan's activities are also subject to extensive regulation,  generally
by state and local government entities. Although we believe that HeartScan is in
substantial  compliance with all applicable  radiological  health  standards and
regulations, we cannot assure that its business will continue to comply with all
the standards and regulations that may be promulgated.  In any event, compliance
with all of the requirements can be costly and time consuming,  with a resultant
material  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,   the  Environmental   Protection  Agency,  and  the
Occupational   Safety  and  Health   Administration.   Changes  in  governmental
regulations or new  regulations  adopted in the future may materially  adversely
affect our business.  In some cases,  state or local regulations may be stricter
than regulations imposed by the Federal government.

We face significant industry competition.

     In the non-cardiac  imaging  applications  market (composed  principally of
hospital  radiology  departments),  our  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
our 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  technologies.  All of these  companies  have greater
financial resources and larger staffs than those of Imatron,  and their products
are, in most cases, substantially less expensive than the ULTRAFAST CT scanner.

     We believe that to compete  successfully  with these  competitors,  we 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
motion is not a limitation and a valuable cardiac and pulmonary  diagnostic tool
capable of producing  useful images of the heart and lungs.  Although we believe
that the ULTRAFAST CT scanner 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.  We  cannot  be  certain  that
potential purchasers of our scanner will accept it without such features.

     Also, we believe that customers and potential customers expect a continuing
development effort to improve the functionality and features of our scanners. We
continually   seek  to  develop   product   enhancements   and  improve  product
reliability.  Our future  success may depend on our ability to complete  certain
product enhancement and product reliability  projects currently in progress,  as
well as on our continued ability to develop new products or product enhancements
in response to new products that may be introduced by other companies. We cannot
assure  that we will be able to  continue  to  improve  product  reliability  or
introduce new product models or product enhancements that are 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.   However,  we  believe  that  our  scanner  is
competitive with respect to each of these factors.

Our operations may be impacted by the Year 2000 issue.

     Many existing  computer  programs use only two digits to identify a year in
the date field.  These programs were designed and developed without  considering
the  impact  of the  upcoming  change in the  century.  If not  corrected,  many
computer  applications  could fail or create erroneous results by or at the Year
2000.  We are  currently  taking  steps to ensure Year 2000  compliance  for our
products and internal  systems.  We believe that all of our current products and
systems are currently Year 2000 ready. Although we can provide no assurance,  we
believe that all of our products and critical internal systems that are not Year
2000 compliant will be compliant prior to January 1, 2000.

     We cannot assure that Year 2000  compliance  will be achieved by customers,
suppliers and other third parties.  We are  communicating  with these parties to
determine how they are addressing the Year 2000 issue and to evaluate any likely
impact on us. At the present time,  it is not possible to determine  whether any
such events are likely to occur,  or to quantify any potential  negative  impact
they may have on our future results of operations and financial condition.

The price of our stock is volatile.

     The market prices for  securities  of advanced  technology  companies  have
historically  been highly volatile,  including the market price of shares of our
common  stock.  Period-to-period  variances in  financial  results can cause the
market  price of our common  stock to  fluctuate  substantially.  We believe the
following factors, among others, could affect our quarterly results:

     o  technological innovations or new commercial products;

     o  results of clinical testing;

     o  changes in government regulations;

     o  regulatory actions;

     o  healthcare reform;

     o  proprietary rights;

     o  litigation; and

     o  public  concerns  as to the safety of our or our  collaborators'
products.

     The stock market has experienced extreme price and volume fluctuations that
have  particularly  affected  the  market  price  for many  advanced  technology
companies,   often  being  unrelated  to  the  operating  performance  of  these
companies. These broad market fluctuations may adversely affect the market price
of our common stock.

We do not intend to pay dividends.

     We have not paid any  dividends  on our  preferred  or common  stock  since
inception,  and we do not anticipate paying dividends in the foreseeable future.
We expect to apply any future  earnings  toward the further  development  of our
business.  You should take this into  account when  deciding  whether to buy our
stock.

If our shareholders do not approve certain transactions with our president,  our
stock could be delisted from the Nasdaq National Market.

     Our shares of common  stock are  currently  listed on the  Nasdaq  National
Market  ("Nasdaq").  Nasdaq's rules generally  require  stockholder  approval of
arrangements  pursuant to which our officers receive our securities,  unless the
securities  are granted as an inducement  to  acceptance of employment  with us.
Certain of the shares issued to and issuable to Terry Ross, our  president,  and
included in this prospectus are required to be approved by our  stockholders.  A
stockholders meeting will be held on October 29, 1999 for the purpose of seeking
such stockholder  approval.  If we fail to comply with Nasdaq  regulations,  our
common stock may be delisted  from Nasdaq.  In such event,  trading,  if any, in
such securities would thereafter be conducted in the over-the-counter  market in
the  so-called  "pink  sheets"  or the  Nasdaq's  "Electronic  Bulletin  Board".
Consequently, the liquidity of our securities could be impaired, not only in the
number of securities  which could bought or sold, but also through delays in the
timing of  transactions,  reduction in security  analysts'  and the news media's
coverage of Imatron,  and lower prices our  securities  than might  otherwise be
obtained.

                                 USE OF PROCEEDS

     We will not  receive  any  proceeds  from the sale of  common  stock by the
selling  stockholders  except for the exercise price of the warrants  underlying
certain  of the  shares  offered  under  this  prospectus.  We intend to use any
proceeds from the exercise of warrants for general corporate purposes.

                                 OFFERING PRICE

     This  prospectus may be used from time to time by the selling  stockholders
who offer the common stock  registered  hereby for sale.  The offering  price of
such common stock will be determined by the selling stockholder 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 Imatron'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 STOCKHOLDERS

     The following table lists the selling  stockholders  and sets forth certain
information  regarding the beneficial  ownership of common stock of each selling
stockholder  as well as the number of shares  each  selling  stockholder  or its
nominee may sell pursuant to this prospectus. The shares are being registered to
permit public  secondary  trading of shares,  and the selling  stockholders  may
offer the shares for resale from time to time.  The  information in the table is
as of the date of this prospectus:

<TABLE>
<S>     <C>                               <C>                    <C>                      <C>

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

     Codsall Corporation, Ltd.                  1,000,000              1,000,000                 *

     Fondation LUMAPA                           1,000,000              1,000,000                 *

     Jose Maria Salema Garcao                   4,285,455              2,000,000                 *

     Daniel M. Heffernan                          358,647                358,647                 *

     Barbara J. Heffernan                         358,647                358,647                 *

     Mark A. Jones                                239,098                239,098                 *

     Liaison Consulting Group, Inc.(3)             50,000                 50,000                 *

     Sitrick & Co.(4)                             169,843                114,726                 *

     Terry Ross(5)                              7,349,990              7,318,740                 *

      TOTAL                                                           12,439,858

</TABLE>
- -----------------------------
* Less than 1%

(1)   Includes  shares  owned prior to this  offering  and the shares  which are
      issuable   upon  the  exercise  of  the  warrants   held  by  the  selling
      stockholders.  The number of shares being  offered  hereby is shown in the
      "Shares Available for Sale Under this Prospectus" column.

(2)   Percentages are based upon the assumption that upon the completion of this
      offering  the  respective  selling  shareholder  has sold the common stock
      listed as  "Shares  Available  for Sale  Under  this  Prospectus"  and are
      computed  on the basis of  94,933,749  shares of common  stock  issued and
      outstanding as of September 14, 1999.

(3)  Liaison Consulting Group, Inc. has provided  consulting services to Imatron
     during the past year.

(4)  Sitrick and Company Inc. has provided public relations  consulting services
     to Imatron and HeartScan at varying times during the past three years.

(5)  Terry Ross, President of Imatron, was issued 200,000 warrants in connection
     with his  employment  agreement  in  January  and  3,351,027  warrants  and
     3,767,713  shares of common  stock in a private  placement  with Imatron in
     June  1999.  Mr.  Ross has  agreed  not to sell,  transfer,  assign or vote
     3,767,713 shares of common stock and warrants to purchase  3,551,027 shares
     of common  stock until the sale to him of such shares has been  approved by
     Imatron shareholders.

                              PLAN OF DISTRIBUTION

     The selling  stockholders may offer their shares at various times in one or
more of the following transactions:

     o    on the Nasdaq  National  Market System (or any other exchange on which
          the shares may be listed);

     o    in the over-the-counter market;

     o    in negotiated transactions other than on such exchanges;

     o    by pledge to secure debts and other obligations;

     o    in connection with the writing on non-traded and exchange-traded  call
          options,  in hedge transactions,  in covering  previously  established
          short   positions  and  in  settlement   of  other   transactions   in
          standardized or over-the-counter options; or

     o    in a combination of any of the above transactions.

     The selling  stockholders may sell their shares at market prices prevailing
at the time of sale, at prices  related to such  prevailing  market  prices,  at
negotiated  prices  or  at  fixed  prices.  The  selling  stockholders  may  use
broker-dealers  to sell their shares.  The  broker-dealers  will either  receive
discounts or  commissions  from the selling  stockholders,  or they will receive
commissions from purchasers of shares.

     Under certain circumstances the selling stockholders and any broker-dealers
that participate in the distribution may be deemed to be  "underwriters"  within
the  meaning  of  the  Securities   Act.  Any   commissions   received  by  such
broker-dealers  and  any  profits  realized  on  the  resale  of  shares  may be
considered  underwriting discounts and commissions under the Securities Act. The
selling stockholders may agree to indemnify such broker-dealers  against certain
liabilities,  including  liabilities  under the Securities Act. In addition,  we
have agreed to  indemnify  the selling  stockholders  with respect to the shares
offered hereby against certain liabilities,  including certain liabilities under
the Securities Act.

     Under the rules and  regulations of the Exchange Act, any person engaged in
the distribution or the resale of shares may not simultaneously engage in market
making activities with respect to the Imatron's common stock for a period of two
business  days  prior to the  commencement  of such  distribution.  The  selling
stockholders  will also be subject to applicable  provisions of the Exchange Act
and  regulations  under the Exchange Act which may limit the timing of purchases
and sales of shares of our common stock by the selling stockholders.

     The selling  stockholders  will pay all  commissions,  transfer taxes,  and
other  expenses  associated  with the sale of  securities  by them.  The  shares
offered  hereby are being  registered  pursuant to  contractual  obligations  of
Imatron, and we have paid the expenses of the preparation of this prospectus. We
have not made any underwriting  arrangements  with respect to the sale of shares
offered hereby.

                                     EXPERTS

     The  consolidated  financial  statements  and  schedule of Imatron Inc. and
subsidiaries  as of December 31, 1998 and 1997, and for each of the years in the
two-year  period  ended  December 31, 1998 have been  incorporated  by reference
herein and in the  registration  statement  in reliance  upon the report of KPMG
LLP, independent certified public accountants, incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.

     Ernst & Young LLP,  independent  auditors,  have  audited our  consolidated
statements of operations, shareholders' equity and cash flows for the year ended
December 31, 1996, included in our Annual report on Form 10-K for the year ended
December  31,  1998,  as set forth in their  report,  which is  incorporated  by
reference in this prospectus and elsewhere in the  registration  statement.  Our
consolidated  financial statements for such period are incorporated by reference
in reliance on Ernst & Young LLP's report,  given on their  authority as experts
in accounting and auditing.

                                  LEGAL OPINION

     The legality of the shares of common stock  offered will be passed upon for
us by Severson & Werson,  A Professional  Corporation,  One Embarcadero  Center,
26th Floor, San Francisco, California 94111.

                       WHERE YOU CAN FIND MORE INFORMATION

     We file annual,  quarterly, and special reports, proxy statements and other
information with the Securities and Exchange Commission (the "Commission").  You
may read and copy any reports,  statements  or other  information  we have filed
with the Commission at the public reference room maintained by the Commission at
450 Fifth  Street,  NW,  Washington,  D.C.  20549,  as well as at the  following
Regional  Offices of the Commission:  Northeast  Regional  Office, 7 World Trade
Center,  New York, New York 10048 and Midwest Regional Office,  500 West Madison
Street, Chicago,  Illinois 60661. You can obtain copies of such material by mail
from the public reference section of the Commission,  at 450 Fifth Street, N.W.,
Washington,  D.C.  20549,  upon  payment  of  certain  fees.  You can  call  the
Commission at 1-800-732-0330 for further  information about the public reference
room. We are also required to file  electronic  versions of these documents with
the Commission,  which may be accessed through the  Commission's  World Wide Web
site at  http://www.sec.gov.  Our common stock is traded on the Nasdaq  National
Market System under the symbol "IMAT."  Information  concerning Imatron may also
be obtained by contacting  NASDAQ/NMS  at 1735 K Street,  NW,  Washington,  D.C.
20006.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The  Commission  allows us to  "incorporate  by  reference"  certain of our
publicly-filed  documents  into this  prospectus,  which means that  information
included in these documents is considered part of this  prospectus.  Information
that we file with the Commission  subsequent to the date of this prospectus will
automatically update and supercede this information. We incorporate by reference
the documents listed below and any future filings made with the Commission under
Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, until
the  selling  stockholders  have  sold  all  their  shares,   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.

     The following  documents  filed with the  Commission  are  incorporated  by
reference in this prospectus:

     1.   Quarterly  Report on Form 10-Q for the  quarter  ended June 30,  1999,
          filed August 13, 1999.

     2.   Annual Report on Form 10-K for the year ended December 31, 1998, filed
          March 31, 1999 and all amendments thereto.

     3.   Proxy Statement dated May 17, 1999,  filed in connection with our 1999
          Annual Meeting of Stockholders.

     4.   Current report on Form 8-K, filed with the SEC on August 10, 1999.

     5.   The   description   of  Imatron's   common  stock   contained  in  the
          Registration Statement on Form 8-A, filed on August 12, 1983 under the
          Exchange Act,  including any amendment or report filed for the purpose
          of updating such description.

     You can  request  a copy  of any or all of the  documents  incorporated  by
reference, other than exhibits to the documents, by writing or telephoning us at
the following  address:  Imatron  Inc.,  389 Oyster Point  Boulevard,  South San
Francisco,  California,  94080,  telephone  number:  (650) 583-9964,  attention:
Acting Chief Financial Officer

<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                                     12,439,858 Shares
as having been authorized by Imatron Inc.
This Prospectus does not constitute an offer
to sell or a solicitation of an offer to buy                   IMATRON INC.
any securities other than those
specifically offered hereby or an offer to buy
to any person in any jurisdiction in which                  No Par Common Stock
such an offer or solicitation would be unlawful.
Neither the delivery of this Prospectus nor
any sale made hereunder shall under any                        PROSPECTUS
circumstances create any implication that the
information  contained herein is correct as of
any time subsequent to the date hereof.                     September 16, 1999



<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  Imatron  in
connection with the sale and distribution of the common stock being registered.1
Selling commissions and counsel for the selling  stockholders are payable by the
selling stockholders.  All the amounts are estimates except for the registration
fee.

SEC Registration fee                                                   $   4012
NASDAQ National Market listing fee                                       43,125
Printing and engraving expenses                                             500
Legal fees and expenses(2)                                                7,500
Accounting fees and expenses                                              7,500
                                                                       --------
Total                                                                  $ 62,637
                                                                       --------
- ----------
(1)  Blue Sky filings.
(2)  Including legal expenses associated with Blue Sky filings.


ITEM 15.  Indemnification of Directors and Officers.

     Article IX of the our Bylaws sets forth the extent to which our officers or
directors  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 or she is or was a
director,  officer,  employee or agent of Imatron,  or of another corporation or
other enterprise which he or she served as such at the request of Imatron, shall
be indemnified by us 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 Imatron)
may  be  indemnified  by  us  against  expenses  (including   attorneys'  fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
by him or her in  connection  with such action,  suit or proceeding if he or she
acted in good faith and in a manner he or she  reasonably  believed  to be in or
not opposed to the best  interest of Imatron,  and, with respect to any criminal
action or proceeding, had no reasonable cause to believe that his or her 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 Imatron may
be indemnified by us against expenses  (including  attorneys' fees) actually and
reasonably  incurred by him or her in connection  with the defense or settlement
of such  action or suit if he or she  acted in good  faith and in a manner he or
she  reasonably  believed  to be in or not  opposed  to the  best  interests  of
Imatron,  except  that no  indemnification  may be made in respect of any claim,
issue or matter as to which he or she shall have been  adjudged to be liable for
negligence or misconduct in the  performance of his or her duty to us 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 Imatron, 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)

3.8                 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                 Form of Common Stock Purchase Agreement between Imatron,
                    Inc. and Jose Maria Salema Garcao(12)

4.2                 Common Stock Purchase Warrant, which expires July 29, 2004,
                    issued to Jose Maria Salema Garcao.(13)

4.3                 Common Stock Purchase Warrant (five year) which expires June
                    15, 2004, issued to Terry Ross.(14)

4.4                 Common Stock Purchase Warrant (one year) which expires June
                    15, 2000, issued to Terry Ross.(15)

4.5                 Stock Purchase Agreement, dated June 16, 1999, between
                    Imatron Inc. and Terry Ross.

4.6                 Lock-Up Agreement, dated September 14, 1999, between Imatron
                    Inc. and Terry Ross.

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

23.1                Consent of KPMG LLP, independent certified public
                    accountants.

23.2                Consent of Ernst & Young LLP, Independent Auditors.

23.3                Consent of Counsel  (included in Exhibit 5.1).

24.1                Power of Attorney (contained in signature pages).

- ----------

(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.

(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  Registration  Statement  on Form 8-K
     filed with the  Commission  on August 10, 1999 and  incorporated  herein by
     reference.

(13) Filed as an Exhibit to the  Company's  Registration  Statement  on Form 8-K
     filed with the  Commission  on August 10, 1999 and  incorporated  herein by
     reference.

(14) Filed as an Exhibit to the  Company's  Registration  Statement  on Form 8-K
     filed with the  Commission  on August 10, 1999 and  incorporated  herein by
     reference.

(15) Filed as an Exhibit to the  Company's  Registration  Statement  on Form 8-K
     filed with the  Commission  on August 10, 1999 and  incorporated  herein by
     reference.

ITEM 17.  Undertakings.

     A. Rule 415 Offering.

     The undersigned registrant hereby undertakes:

          (1) To file,  during  any  period  in which  offers or sales are being
made, a post-effective amendment to this registration statement:

               (i) to include any prospectus required by Section 10(a)(3) of the
Securities Act;

               (ii) to reflect  in the  prospectus  any facts or events  arising
after the  effective  date of the  registration  statement  (or the most  recent
post-effective  amendment  thereof)  which,  individually  or in the  aggregate,
represent a fundamental  change in the information set forth in the registration
statement.  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 set 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  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.

     We hereby  undertake  that, for purposes of determining any liability under
the Securities  Act, each filing of Imatron'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 Imatron
pursuant to the foregoing  provisions,  or  otherwise,  Imatron 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 Imatron of expenses incurred
or  paid  by a  director,  officer  or  controlling  person  of  Imatron  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,  Imatron  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
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the  City of  South  San  Francisco,  State  of  California,  on
September 16, 1999.

                                   IMATRON INC.


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


<PAGE>


                                POWER OF ATTORNEY

     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
____________________        Chief Executive Officer,        September 15, 1999
S. Lewis Meyer              Acting Chief Financial
                            Officer and Director (Principal
                            Executive Officer and Principal
                            Financial and Accounting Officer)

/s/ Douglas P. Boyd
____________________        Chairman of the Board           September 15, 1999
Douglas P. Boyd


/s/ Terry Ross
____________________        President and Director          September 15, 1999
Terry Ross


/s/ John L. Couch
____________________        Director                        September 15, 1999
John L. Couch


/s/ Aldo Test
____________________        Director                        September 15, 1999
Aldo Test


/s/ William J. McDaniel
____________________        Director                        September 15, 1999
William J. McDaniel


<PAGE>


                                  IMATRON INC.

                          INDEX TO EXHIBITS FILED WITH
                         FORM S-3 REGISTRATION STATEMENT

                        12,439,858 Shares of Common Stock

<TABLE>
<S>                 <C>                                                                                       <C>

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


        4.5          Stock Purchase Agreement, dated June 16, 1999, between Imatron Inc. and Terry              26
                     Ross.

        4.6          Lock-Up Agreement, dated September 14, 1999, between Imatron Inc. and Terry Ross.          34

        5.1          Opinion of Severson & Werson, A Professional Corporation, as to legality of                35
                     securities being registered.

       23.1          Consent of KPMG LLP, independent certified public accountants.                             37

       23.2          Consent of Ernst & Young LLP, independent certified public accountants.                    38

       23.3          Consent of counsel (included in Exhibit 5.1).

       24.1          Power of Attorney (contained in signature pages)

</TABLE>


                                   EXHIBIT 4.5

          STOCK PURCHASE AGREEMENT BETWEEN IMATRON INC. AND TERRY ROSS.


     THIS STOCK PURCHASE  AGREEMENT  ("Agreement") is made as of the 16th day of
June, 1999 by and between IMATRON INC., a New Jersey  corporation with principal
offices located at 389 Oyster Point Boulevard,  South San Francisco,  California
94080 ("Seller") and TERRY ROSS (the "Purchaser").

     WHEREAS,  Seller has  authorized the issuance and sale of certain shares of
its common stock (the "Common  Stock") and warrants to purchase its common stock
(the "Warrants") in exchange for certain consideration; and

     WHEREAS,  Purchaser  desires to  purchase  and  Seller  desires to sell the
Shares on the terms and conditions set forth herein.

     NOW,  THEREFORE,  in  consideration of the mutual covenants and agreements,
the Seller and Purchaser hereby agree as follows:

                                    AGREEMENT

     1. Purchase and Sale of Shares. Seller agrees to sell to Purchaser and upon
the basis of the  representations  and warranties,  and subject to the terms and
conditions,  set forth in this  Agreement,  Purchaser  agrees to purchase for an
Aggregate Purchase Price equal to the following:  (i) 3,767,713 shares of Common
Stock (the  "Shares");  (ii) a five year warrant to purchase  360,000  shares of
Common  Stock at  $1.044;  and (iii) a one year  warrant to  purchase  2,991,077
shares of Common Stock at $1.003 per share (collectively,  the "Warrants").  The
forms of the Warrants  are  attached  hereto as Exhibits A and B. The Shares and
the Warrants are hereinafter  collectively referred to as the "Securities".  The
Shares and the shares of Common Stock issuable upon exercise of the Warrants are
hereinafter referred to as the "Registrable Securities".

     2. Closing.  The closing of the purchase and sale of securities pursuant to
Section 1 hereof  shall take place at the offices of Seller set forth in Section
12 below as soon as all of the conditions set forth in Section 6 below have been
satisfied.  Within ten (10)  business days  following  the Closing,  Seller will
deliver to Purchaser certificates representing the Securities.  Delivery of such
certificates shall be in accordance with Purchaser's instructions.

     3. Restriction on Transfer of Securities.

          3.1. Restrictions.  The Shares are transferable only pursuant to (a) a
public  offering  registered  under the  Securities Act of 1933, as amended (the
"Securities  Act"),  (b) Rule 144 (or any similar  rule then in effect)  adopted
under the  Securities  Act,  if such rule is  available,  and (c) subject to the
conditions  elsewhere  specified in this Section 4, any other legally  available
means of transfer.

          3.2. Legend. Each certificate representing Securities will be endorsed
with  the  following  legend:  "The  securities  evidenced  hereby  may  not  be
transferred without (i) the opinion of counsel  satisfactory to the Company that
such transfer may be lawfully made without registration under the Securities Act
of 1933 and all applicable state securities laws or (ii) such registration."

          3.3. Stop Transfer  Order.  A stop transfer order shall be placed with
the  Seller's  transfer  agent  preventing  transfer  of any  of the  securities
referred to in Section 3.2 above  pending  compliance  with the  conditions  set
forth in any such legend.

          3.4.  Removal  of Legend.  Any legend  endorsed  on a  certificate  or
instrument  evidencing  a  security  pursuant  to Section  3.2  hereof  shall be
removed,  and Seller shall issue a certificate or instrument without such legend
to the holder of such security,  (a) in accordance with Section 3.2 hereof,  (b)
if such  security  is being  disposed  of  pursuant  to  registration  under the
Securities  Act and any  applicable  state acts or  pursuant  to Rule 144 or any
similar  rule then in effect,  or (c) if such  holder  provides  Seller  with an
opinion  of counsel  satisfactory  to it to the  effect  that a sale,  transfer,
assignment, offer, pledge or distribution for value of such security may be made
without  registration  and that  such  legend is not  required  to  satisfy  the
applicable exemption from registration.

     4. Representations and Warranties by Seller. Seller represents and
warrants to Purchaser that:

          4.1.  Organization,  Standing,  Power.  Seller is a  corporation  duly
organized,  validly existing and in good standing under the laws of the State of
New  Jersey  and has the  requisite  corporate  power and  authority  to own its
properties  and to carry on its business in all  material  respects as it is now
being  conducted.  Seller  has,  or at the  Closing  will  have,  the  requisite
corporate power and authority to issue the Securities,  and to otherwise perform
its obligations under this Agreement.

          4.2. Qualification.  Seller is duly qualified or licensed as a foreign
corporation  in good  standing  in each  jurisdiction  wherein the nature of its
activities  or of its  properties  owned or leased makes such  qualification  or
licensing  necessary  and failure to be so  qualified  or licensed  would have a
material adverse impact on its business.

          4.3.  Compliance  with  Applicable  Laws and  Other  Instruments.  The
business  and  operations  of  Seller  have  been  and are  being  conducted  in
accordance with all applicable  laws,  rules and regulations of all governmental
authorities.  Subject to shareholder  approval of appropriate  amendments to the
Articles of  Incorporation  as contemplated  by this Agreement,  and except with
respect to existing  registration rights of holders of certain securities issued
by Seller,  neither the  execution  nor delivery of, nor the  performance  of or
compliance  with,  this  Agreement  nor  the  consummation  of the  transactions
contemplated  hereby will conflict with or, with or without the giving of notice
or passage of time,  result in any breach of, or constitute a default under,  or
result in the imposition of any lien or  encumbrance  upon any asset or property
of  Seller  pursuant  to,  any  applicable  law,  administrative  regulation  or
judgment,  order or decree of any court or  governmental  body, any agreement or
other  instrument  to  which  Seller  is a party  or by  which  it or any of its
properties,  assets or rights is bound or  affected,  and will not  violate  the
Articles of Incorporation or Bylaws of Seller. Seller is not in violation of its
Articles of Incorporation or its Bylaws.

          4.4.  Common  Stock.  The Shares,  and the Common Stock  issuable upon
exercise of the Warrants, when issued and paid for pursuant to the terms of this
Agreement, will be duly authorized,  validly issued and outstanding, fully paid,
nonassessable  and  free and  clear  of all  pledges,  liens,  encumbrances  and
restrictions.

     5.  Representations and Warranties of Purchaser.  Purchaser  represents and
warrants that:

          5.1.  Investment  Intent.  The Securities being acquired hereunder are
being  purchased  for  Purchaser's  own account and not with the view to, or for
resale in connection  with, any  distribution or public offering  thereof within
the meaning of the Securities  Act.  Purchaser  understands  that the Securities
have not been registered  under the Securities Act or any applicable  state laws
by reason of their  issuance or  contemplated  issuance in a transaction  exempt
from the registration and prospectus delivery requirements of the Securities Act
and such laws and that the reliance of Seller and others upon this  exemption is
predicated  in part upon this  representation  and warranty.  Purchaser  further
understands  that the  Securities  may not be  transferred or resold without (a)
registration  under the Securities Act and any applicable  state securities laws
or (b) an exemption from the  requirements  of the Securities Act and applicable
state securities laws.

          5.2.  Accredited  Investor.   Purchaser  qualifies  as  an  accredited
investor within the meaning of Rule 501 under the Securities Act.  Purchaser has
such knowledge and  experience in financial and business  matters that Purchaser
is capable of  evaluating  the  merits  and risks of the  investment  to be made
hereunder by Purchaser.

          5.3. Acts and  Proceedings.  This Agreement has been duly executed and
delivered by Purchaser,  and is a valid and binding  agreement  upon the part of
Purchaser.

          5.4. No Brokers or Finders. No person, firm or corporation has or will
have,  as a result of any act or omission by Purchaser,  any right,  interest or
valid claim against Seller for any  commission,  fee or other  compensation as a
finder  or  broker,  or  in  any  similar  capacity,   in  connection  with  the
transactions  contemplated by this Agreement.  Purchaser will indemnify and hold
Seller  harmless  against  any  and  all  liability  with  respect  to any  such
commission,  fee or other  compensation which may be payable or determined to be
payable  as a  result  of the  actions  of  Purchaser  in  connection  with  the
transactions contemplated by this Agreement.

     6. Conditions of Purchaser's Obligation. Purchaser's obligation to purchase
and pay for the  Securities  on the Closing  Date is subject to the  fulfillment
prior to or on the Closing Date of the conditions set forth below.  In the event
that any such  condition is not  satisfied  to  Purchaser's  satisfaction,  then
Purchaser shall not be obligated to proceed with the purchase of such Shares nor
further with any of its obligations pursuant to this Agreement.

          6.1. No Errors,  etc. The  representations  and  warranties  of Seller
under this  Agreement  shall be true in all material  respects as of the Closing
Date with the same effect as though made on and as of the Closing Date.

          6.2.  Compliance  with  Agreement.  Seller  shall have  performed  and
complied in all material respects with all agreements or conditions  required by
this  Agreement  to be performed  and complied  with by it prior to or as of the
Closing.

          6.3.  Qualification  Under State Securities  Laws. All  registrations,
qualifications, permits and approvals required under applicable state securities
laws for the lawful  execution  and  delivery of this  Agreement  and the offer,
sale, issuance and delivery of the Securities shall have been obtained.

          6.4.  Proceedings and Documents.  All corporate and other  proceedings
and actions taken in connection with the  transactions  contemplated  hereby and
all  certificates,  opinions,  agreements,  instruments and documents  mentioned
herein or incident to any such  transaction  shall be  satisfactory  in form and
substance to Purchaser and its counsel.

     7.  Conditions  of Seller's  Obligation.  Seller's  obligation  to sell the
Securities to Purchaser on the Closing Date is subject to the fulfillment  prior
to or on the Closing Date of the conditions  set forth below.  In the event that
any such  condition is not  satisfied,  Seller shall not be obligated to proceed
with the sale of such Securities.

          7.1. No Errors,  etc. The  representations and warranties of Purchaser
under this  Agreement  shall be true in all material  respects as of the Closing
with the same effect as though made on and as of the Closing.

          7.2.  Compliance with  Conditions.  Purchaser shall have performed and
complied  with all  agreements or  conditions  required by this  Agreement to be
performed and complied with by it prior to or as of the Closing.

     8. Seller Affirmative Covenants. Seller covenants and agrees that:

          8.1. Corporate Existence. Seller will maintain its corporate existence
in good  standing and comply with all  applicable  laws and  regulations  of the
United States or of any state or states thereof or of any political  subdivision
thereof and of any governmental  authority where failure to so comply would have
a material adverse impact on Seller or its business or operations.

          8.2.  Books of Account and Reserves.  Seller will keep books of record
and  account in which  full,  true and  correct  entries  are made of all of its
respective dealings, business and affairs, in accordance with generally accepted
accounting principles.  Seller will employ certified public accountants selected
by the  Board  who  are  "independent"  within  the  meaning  of the  accounting
regulations  of the  Securities  and  Exchange  Commission  and will have annual
audits made by such independent  public  accountants in the course of which such
accountants shall make such examinations,  in accordance with generally accepted
auditing  standards,  as will enable them to give such reports or opinions  with
respect to the financial statements of Seller that will satisfy the requirements
of the Securities and Exchange Commission in effect at such time with respect to
certificates and opinions of accountants.

          8.3. Furnishing of Financial  Statements and Information.  Seller will
deliver to Purchaser:

               (a) as soon as practicable, but in any event within 45 days after
the close of each quarterly  period,  unaudited  consolidated  balance sheets of
Seller as of the end of such  period,  together  with the  related  consolidated
statements  of  operations  and cash  flow for such  period,  setting  forth the
budgeted  figures for such period  prepared  and  submitted in  connection  with
Seller's  annual  business  plan  and  in  comparative   form  figures  for  the
corresponding  quarterly  period of the previous  fiscal year, all in reasonable
detail and certified by an authorized  accounting officer of Seller,  subject to
year-end adjustments;

               (b) s soon as practicable,  but in any event within 90 days after
the end of each fiscal year, a  consolidated  balance  sheet of Seller as of the
end of such fiscal year,  together with the related  consolidated  statements of
operations,  shareholders'  equity and cash flow for such fiscal  year,  setting
forth  in  comparative  form  figures  for  the  previous  fiscal  year,  all in
reasonable detail and duly certified by Seller's independent public accountants,
which  accountants  shall have given  Seller an opinion,  unqualified  as to the
scope of the audit, regarding such statements; and

               (c)  with  reasonable  promptness,   such  other  financial  data
relating  to the  business,  affairs  and  financial  condition  of Seller as is
available to Seller and as from time to time Purchaser may reasonably request.

     9.  Registration  of Stock.  The Company shall use its best efforts to file
with the SEC as  promptly  as  practicable  and  thereafter  shall  use its best
efforts to cause to be declared effective by December 15, a "shelf" registration
statement on the  appropriate  form under the  Securities  Act providing for the
registration  of, and the sale on a continuous or delayed basis by Purchaser all
of the Registrable Securities, pursuant to Rule 415 or any similar rule that may
be adopted by the SEC (the "Shelf Registration"). The Company shall use its best
efforts to keep the Shelf Registration continuously effective in order to permit
the  prospectus  forming  part  thereof to be usable by  Purchaser  for a period
ending on the earlier of (i) (x) the second anniversary of the Closing,  (y) the
expiration of the period following the Closing after which Rule 144(k) under the
Securities Act generally becomes available to non-affiliates of an issuer or (z)
in the event the Company  has at any time  suspended  the use of the  prospectus
contained in the Shelf Registration pursuant to this paragraph,  the date beyond
the earlier of the periods  referred to in clauses (x) and (y) that  reflects an
additional  period of days equal to the number of days during all of the periods
from and  including  the  dates the  Company  gives  notice  of such  suspension
pursuant to this paragraph to and including the date when holders of Registrable
Securities  receive an amended or  supplemented  prospectus  necessary to permit
resales  of  Registrable  Securities  under  the  Shelf  Registration  or to and
including the date on which the Company  gives a Resumption  Notice of (ii) such
time as all of the Registrable Securities covered by the Shelf Registration have
been sold  pursuant  to the Shelf  Registration  or pursuant to Rule 144 (in any
such case,  such  period  being  called the "Shelf  Registration  Period").  The
Company  shall be  deemed  not to have used its best  efforts  to keep the Shelf
Registration  effective during the requisite period if it voluntarily  takes any
action that would result in holders of Securities covered thereby not being able
to offer and sell Registrable Securities during that period, unless such action,
in the opinion of the Company after  consulting with legal counsel,  is required
by applicable law. Notwithstanding any other provisions hereof, the Company will
ensure  that  (i) any  Shelf  Registration  and any  amendment  thereto  and any
prospectus  forming  part  thereof and any  supplement  thereto  complies in all
material  respects  with  the  Securities  Act and  the  rules  and  regulations
thereunder, (ii) any Shelf Registration and any amendment thereto does not, when
it becomes effective,  contain an untrue statement of a material fact or omit to
state a material  fact  required to be stated  herein or  necessary  to make the
statements  therein not misleading and (iii) any prospectus  forming part of any
Shelf  Registration,  and any supplement to such  prospectus does not include an
untrue  statement of a material fact or omit to state a material fact  necessary
in order to make the statements therein, in the light of the circumstances under
which they were made, not misleading.

          9.1.  Indemnification.  In the event that Shares purchased pursuant to
this  Agreement are included in a registration  statement  under this Section 9,
Seller will indemnify and hold harmless each Selling  Shareholder and each other
person, if any, who controls such Selling  shareholder within the meaning of the
Securities Act,  against any losses,  claims,  damages or liabilities,  joint or
several,  to which such Selling  Shareholder  or  controlling  person may become
subject under the Securities Act or otherwise,  insofar as such losses,  claims,
damages or  liabilities  (or actions in respect  thereof) arise out of are based
upon any untrue  statement or alleged  untrue  statement  of any  material  fact
contained, on the effective date thereof, in any registration statement pursuant
to which the Shares were  registered  under the Securities  Act, any preliminary
prospectus or final prospectus contained therein, or any amendment or supplement
thereto,  or arise out of or are based upon the omission or alleged  omission to
state therein a material fact required to be stated therein or necessary to make
the  statements  therein not  misleading,  or arise out of or are based upon the
failure by Seller to file any amendment or supplement  thereto that was required
to  be  filed  under  the  Securities  Act,  and  will  reimburse  such  Selling
Shareholder and each such controlling person for any legal or any other expenses
reasonably  incurred by them in connection with  investigating  or defending any
such loss, claim,  damage,  liability or action.  Notwithstanding the foregoing,
Seller  will not be liable in any such case to the  extent  that any such  loss,
claim,  damage,  or liability arises out of or is based upon an untrue statement
or omission made in such registration statement,  preliminary prospectus,  final
prospectus or amendment or  supplement  in reliance upon and in conformity  with
written  information  furnished to Seller through an instrument duly executed by
or on behalf of any Selling Shareholder  specifically for use in the preparation
of such registration  statement,  preliminary prospectus,  final prospectus,  or
amendment or supplement.

          It shall be a condition  precedent to the obligation of Seller to take
any  action  pursuant  to this  Section  that  seller  shall  have  received  an
undertaking  satisfactory  to it from each Selling  Shareholder to indemnify and
hold harmless  Seller (in the same manner and to the same extent as set forth in
this  Section),  each  director  of  Seller,  each  officer  who shall sign such
registration statement, and any persons who control Seller within the meaning of
the  Securities  Act,  with  respect  to any  statement  or  omission  from such
registration  statement,   preliminary  prospectus,   or  any  final  prospectus
contained therein,  or any amendment or supplement thereto, if such statement or
omission was made in reliance  upon and in conformity  with written  information
furnished to Seller  through an  instrument  duly  executed by the  indemnifying
party  specifically for use in the preparation of such  registration  statement,
preliminary prospectus, final prospectus, or amendment or supplement.

          Promptly  following  receipt by an indemnified  party of notice of the
commencement  of any action  involving a claim referred to above in this Section
9.3, such  indemnified  party will, if a claim in respect  thereof is to be made
against  an  indemnifying  party,  give  written  notice  to the  latter  of the
commencement  of such  action.  In case any such  action is  brought  against an
indemnified party, the indemnifying party will be entitled to participate in and
to  assume  the  defense  thereof,  jointly  with any other  indemnifying  party
similarly  notified,  to the extent that it may wish,  with  counsel  reasonably
satisfactory to such  indemnified  party, and after notice from the indemnifying
party to such  indemnified  party of its election to assume the defense thereof,
the  indemnifying  party  will not be liable to such  indemnified  party for any
legal or other expenses  subsequently  incurred by the latter in connection with
the defense thereof.

          9.2.  Binding  Provisions.  The  provisions of this Section 9 shall be
binding on the successors of Seller. No Shareholder may assign the provisions of
this  Section  9 or all or any  part  of its  or  their  rights  or  obligations
hereunder,  except that in the event of a merger or  consolidation  in which the
Seller is not the survivor,  the Seller shall assign and transfer, and successor
shall assume, the provisions of this Section 9.

          9.3.  Conflicts.  To the  extent  that  Seller's  compliance  with the
obligations  set forth in Sections 9.1 through 9.4 above would  conflict with or
otherwise  cause a breach of or default  under any of its  existing  obligations
pursuant to any agreements to which it currently is a party, Seller's failure to
comply with those obligations shall not be deemed a breach of this Agreement.

          9.4. Liquidated Damages. In the event that the Company by December 15,
1999 shall fail to cause the Shelf  Registration  Statement  with respect to the
Securities  to be  declared  effective  and shall fail to obtain  all  necessary
stockholder and NASDAQ approvals in order to enable Purchaser to freely sell the
Registrable Securities pursuant to the Shelf Registration, the Company shall pay
to the  Purchaser  for  each  month  or  portion  thereafter  until  such  Shelf
Registration  Statement becomes effective an amount equal to two percent (2%) of
the purchase price paid for the Securities pursuant to this Agreement.  Provided
that the Company shall continue to use its reasonable best efforts to cause such
Shelf Registration to become effective as promptly as practicable,  the delivery
of such Common Stock shall be in full  satisfaction of any liability on the part
of the Company for failing to register the Shares as provided  herein;  provided
further  however,  that such  delivery  shall not  excuse the  Company  from the
obligation to register all of such  Registrable  Shares which  obligation  shall
continue.

     10. Remedies Cumulative, and not Waived.

          10.1.  No right,  power or remedy  conferred  upon any party  shall be
exclusive,  and each such  right,  power or remedy  shall be  cumulative  and in
addition to every other right,  power or remedy,  whether conferred hereby or by
any such  security  or now or  hereafter  available  at law or in  equity  or by
statute or otherwise.

          10.2.  No course  of  dealing  between  the  parties,  and no delay in
exercising any right,  power or remedy  conferred hereby or by any such security
or now or  hereafter  existing  at law or in equity or by statute or  otherwise,
shall  operate as a waiver of or otherwise  prejudice  any such right,  power or
remedy;  provided,  however,  that this  Section  10 shall not be  construed  or
applied  so as to negate  the  provisions  and  intent of any  statute  which is
otherwise applicable.

     11. Changes,  Waivers, etc. Neither this Agreement nor any provision hereof
may be changed, waived, discharged or terminated orally, but only by a statement
in writing signed by the party against which enforcement of the change,  waiver,
discharge or termination is sought.

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

                  Imatron Inc.
                  389 Oyster Point Blvd.
                  South San Francisco, California 94080
                  Attn:  Chief Financial Officer

                  Telephone:        (650) 583-9964
                  Facsimile:        (650) 871-0418

     13. Survival of Representations  and Warranties,  etc. All  representations
and warranties contained herein shall survive the execution and delivery of this
Agreement, any investigation at any time made by Purchaser or on its behalf, and
the  sale  and  purchase  of  the  Shares.  All  statements   contained  in  any
certificate,  instrument  or other  writing  delivered by or on behalf of Seller
pursuant  hereto or in  connection  with or  contemplation  of the  transactions
herein contemplated (other than legal opinions) shall constitute representations
and warranties by Seller hereunder and not by the individual  officer who signed
the certificate, instrument or writing by or on behalf of Seller.

     14.  Parties in Interest.  All the terms and  provisions of this  Agreement
shall be  binding  upon and inure to the  benefit of and be  enforceable  by the
respective successors and assigns of the parties hereto, whether so expressed or
not, and, in particular, shall inure to the benefit of and be enforceable by the
current holder or holders of any of the Shares.

     15. Headings. The headings of the Sections and paragraphs of this Agreement
have been inserted for  convenience  of reference  only and do not  constitute a
part of this Agreement.

     16.  Choice of Law. It is the  intention  of the  parties  that the laws of
California shall govern the validity of this Agreement,  the construction of its
terms and the interpretation of the rights and duties of the parties.

     17.  Counterparts.  This Agreement may be executed  concurrently  in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

     18.  Severability.  In the  event  that  any  part  of  this  Agreement  is
determined by a court of competent jurisdiction to be unenforceable, the balance
of the Agreement shall remain in full force and effect.

     IN WITNESS  WHEREOF,  the parties execute this Agreement as of the date set
forth below.

                                        SELLER:

                                        IMATRON INC.



                                        By:
                                          -----------------------------------
                                             Chief Executive Officer


                                        PURCHASER:




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


                                        --------------------------------------
                                                    Address

                                        --------------------------------------
                                                 City and Country

                                        --------------------------------------
                                                Facsimile Number



                                   EXHIBIT 4.6

             LOCK-UP AGREEMENT BETWEEN IMATRON INC. AND TERRY ROSS.


     THIS  LOCK-UP  AGREEMENT  (this  "Agreement")  is  made  this  14th  day of
September, 1999 by and between IMATRON INC., a New Jersey corporation ("Seller")
and Terry Ross (the "Purchaser").

                                    RECITALS:

     WHEREAS, Seller and Purchaser have previously entered into an agreement for
the purchase and sale of 3,767,713 shares of Seller's common stock (the "Shares)
and  warrants  to  purchase  3,351,027  shares of  Seller's  common  stock  (the
"Warrants"); and

     WHEREAS, pending the approval of the foregoing transaction the Nasdaq Stock
Market,  Inc. has requested that Purchaser's  rights with respect to such shares
be restricted as hereinafter provided.

     NOW, THEREFORE, the parties hereto agree as follows:

     1. Purchaser agrees that until Seller's  shareholders  have approved of the
purchase  and sale of the Shares and the Warrants in the manner  provided  under
New  Jersey  law,  Purchaser  shall not sell,  transfer  or assign the Shares or
Warrants nor shall Purchase vote the Shares. Upon receipt of such approval, this
Agreement and the  obligation of Purchaser  pursuant  hereto shall be terminated
and shall thereafter be without any further force or effect.

     2.  Seller  agrees to  promptly  notice  and hold a special  meeting of its
shareholders  for the purpose of acting upon a proposal to approve the  purchase
and sale of the Shares and the Warrants.

     3. All other terms and conditions  relating to the purchase and sale of the
Shares and Warrants shall remain in full force and effect.

     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date and year first above written.

                                   Purchaser:

                                        -------------------------------
                                                  Terry Ross

                                    Seller:

                                        Imatron Inc.

                                        By:
                                          --------------------------------
                                        Its Chief Executive Officer




                                   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

                               September 15, 1999



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  stockholders  covering  the
offering of up to 12,439,858  shares of Imatron's  common stock (the  "Shares").
Such total  includes  7,743,226  shares  currently  issued and  outstanding  and
4,696,632  shares which are issuable upon the exercise of outstanding  warrants.
All of the  outstanding  shares,  the  warrants  and the  exchange  rights  were
previously  issued  by  the  Company  to the  selling  stockholders  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.

     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.

                                      Very truly yours,


                                      /s/ Severson & Werson



                                  Exhibit 23.1

               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS



The Board of Directors
Imatron Inc.:

     We consent to the  incorporation  by reference of our report dated February
12,  1999,  relating to the  consolidated  balance  sheets of Imatron  Inc.  and
subsidiary  as of December  31,  1998,  and 1997,  and the related  consolidated
statements of  operations,  shareholders'  equity and cash flows for each of the
years in the two-year period ended December 31, 1998, and the related  schedule,
which report  appears in the December  31, 1998,  annual  report on Form 10-K of
Imatron Inc. and to the reference to our firm under the heading "Experts" in the
prospectus.


                                                   /s/ KPMG LLP
                                                  -------------------

San Francisco, California
September 15, 1999




                                  Exhibit 23.2

                          CONSENT OF Ernst & Young LLP,
                              INDEPENDENT AUDITORS



The Board of Directors
Imatron Inc.:

We  consent to the  reference  to our firm under the  caption  "Experts"  in the
Registration Statement (Form S-3 No. 333-0000) and related Prospectus of Imatron
Inc. for the  registration  of 12,439,858  shares of its common stock and to the
incorporation by reference therein of our report dated February 14, 1997, except
for  Note 17,  as to which  the date is April  10,  1998,  with  respect  to the
consolidated  statements of operations,  shareholders' equity and cash flows for
the year ended December 31, 1996, of Imatron Inc.  included in its Annual Report
(Form 10-K) for the year ended December 31, 1998,  filed with the Securities and
Exchange Commission.


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

San Francisco, California
September 15, 1999



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