Document:

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                                                                   EXHIBIT 10.18

January 11, 2002

Mr. David N. Gill
2712 Long Grove Drive
Marietta, GA 30062

Dear David:

We're very pleased to offer you employment as the Chief Financial Officer and
Senior Vice President of Finance for CTI, Inc. In this position you will report
to the CTI President and serve with the other Officers of CTI in the leadership
of CTI and its businesses. The effective date of your employment with CTI will
be January 14, 2002, or any date within 17 days of this offer letter that is
acceptable to you and CTI.

As discussed, your principal objective will be to lead the finance and
accounting functions of CTI. We believe you have the background and skills to
make a significant contribution to our long-term success, and that you will play
an important in helping CTI achieve our goals and objectives. We also believe
that CTI provides a unique environment and career challenges that will stimulate
your continued personal and professional development.

We are offering you a comprehensive compensation package that includes the
following elements:

-        Base salary of $185,000 a year, paid every two weeks. Your salary will
         be reviewed annually by the Board of Directors of CTI.

-        A professional expense and car allowance of $8,000 per year, paid every
         two weeks. In the first year, the $8,000 will be paid to you in the
         form of a stock as of the effective date of your employment with CTI
         (see below).

-        Participation in the executive incentive pay program. Basically, you
         can earn up to 120% or more of your base salary in incentive pay
         compensation. For a "normal" year, e.g. one in which we make plan, you
         could earn a cash bonus of 40% of base pay for the year. For a "very
         good" year, you could earn up to an additional 40% of base pay with 50%
         of the amount in cash and 50% in stock options. For an "outstanding"
         year, you could earn up to an additional 40% of base pay all of which
         would be in stock options. The number of shares in the options would be
         determined from the dollar amount of the applicable bonus and the
         current stock option price of the stock at the time of the award. The
         parameters defining a normal, very good, and outstanding year will be
         defined at the beginning of the year by the Officer Compensation
         Committee of the Board. Since our fiscal year began in October and you
         did not participate in the plan development, we will guarantee a
         minimum cash bonus of 50% this year. The Officer Compensation Committee
         will determine any awards beyond this amount.
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-        The total minimum guaranteed bonus in your first year will be $92,500.
         You have elected to take this bonus as well as the $8,000 car allowance
         in the form of a stock grant for 13,400 shares ($100,500 / $7.50 per
         share). This stock will be issued to you within 60 days of your
         effective employment date.

-        An Incentive Stock Option grant of 160,000* CTI shares at the current
         stock option price as set by the CTI Board of Directors of $7.50 per
         share. (*The first $100,000 in value per option grant will be qualified
         incentive stock options. The remainder will be non-qualified options.)
         Twenty percent of the options would vest on your start date and 20%
         would vest on each anniversary of your start date. On a
         change-of-control of CTI, your options would be totally vested.
         Obviously, the potential for significant returns from the growth in
         value of CTI is very high, and you will be a major contributor to
         making that happen.

-        An excellent Fringe Benefits Program, which includes a medical and
         dental plan, life insurance, and a 401(k) Plan. The CTI Benefits
         Program provides a number of individual options, including the
         opportunity to achieve tax savings through Flexible Spending and
         Dependent Care Accounts. We have provided some additional information
         that will help to quantify the value of your personal CTI benefits
         package.

-        Three weeks of vacation per year and ten paid holidays.

-        A relocation package which includes the relocation of your household
         goods with our current carrier, QuickWay Transportation, temporary
         housing for up to 90 days with Corporate Quarters, and a relocation
         allowance of up to $60,000. The relocation allowance is provided to
         cover transition expenses such as current home sale costs, new home
         closing costs, final moving trip expenses, miscellaneous items such as
         car tags and cable/phone connections, and IRS taxes on the allowance
         amount.

This offer is contingent on your ability to pass a drug screening test
administered by a licensed physician designated by and compensated by CTI. This
offer is also contingent on your agreement to CTI's "Guidelines for Protection
of Confidential and Proprietary Information," which are attached. You should
sign and return these guidelines to us with the signed copy of the offer letter.

In the event that, CTI terminates your employment for any reason other than
Cause or Disability, then you shall be entitled to receive the following
payment: CTI shall pay you following the date of your employment termination and
over the succeeding (12) twelve months, in accordance with standard payroll
procedures, an amount equal to twelve (12) months of your Base Compensation in
effect on the date of the employment termination. Any stock options that have
vested at the date of termination will remain vested. In addition, the following
supplementary vesting conditions will apply:

1.       If you are terminated for any reason other than Cause prior to an IPO,
         an addition year's worth, or 20%, of options will vest at the date of
         termination.
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2.       If you are terminated for any reason other than Cause after an IPO, an
         additional year's worth or 20% of options will vest at the date of
         termination. In addition, a minimum of at least 50% of all your options
         will be considered vested at that date.

3.       If you are terminated after a personnel change for CTI, Inc.'s CEO,
         president or COO, and after an IPO has occurred, then all of your
         options held at that time will accelerate vest and be fully
         exercisable.

CTI may terminate your employment for "Cause." "Cause" will exist in the event
you are convicted of a felony, or carrying out your duties, you are guilty of
gross negligence or gross misconduct resulting, in either case in material harm
to CTI. In the event your employment is terminated for Cause, you will be
entitled to any unpaid salary through the date of termination due you, and you
will be entitled to no other compensation hereunder from CTI and your deferred
compensation will be forfeited.

We want you to know how much we hope that you decide to join us. If you have any
questions or we can assist you in any way, please let us know.

Best Regards,

    /s/  Terry Douglass                             /s/ Traci Etherton
-----------------------------                  -------------------------------
Terry Douglass                                        Traci Etherton
President & CEO                                     Human Resources Manager

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The undersigned accepts the above employment offer and agrees that it contains
the terms of employment with CTI and that there are no other terms expressed or
implied. In addition, by accepting the terms of the above employment offer, the
undersigned hereby acknowledges and recognizes the highly competitive nature of
CTI's business and agrees that he will not, after termination of employment with
CTI for a period of (1) year:

a.       directly or indirectly engage in any Competitive Business (as
         hereinafter defined), whether as an officer, director, owner, investor,
         employee, partner, or other participant in any such business:

b.       assist others in engaging in any such capacity in any Competitive
         Business;

c.       induce employees of the Company to terminate their employment with the
         Company or to engage in any such capacity in any Competitive Business;
         or

d.       interfere with or disrupt or attempt to interfere or disrupt any
         relationship of any employee of the company with any employee,
         consultant, customer or supplier thereof.

[As used herein, the term "Competitive Business" shall mean and include any
business (whether or not for profit) which directly or indirectly competes with
the business conducted by the Company or its affiliates.]

         /s/ David N. Gill                           Date:             1/11/02
------------------------------------                      ----------------------
David N. Gill<PAGE>

                                                                   EXHIBIT 10.19

February 15, 2000

Mark S. Rhoads
797 N. St. Augustine Road
Chesapeake City, MD 21915

Dear Mark:

We're very pleased to offer you employment as the President and CEO of P.E.T.Net
Pharmaceutical Services. In this position, you will report to the Board of
Directors of P.E.T.Net, and work closely with other P.E.T.Net and CTI employees.

As you know, P.E.T.Net is the only commercial company that manufactures and
distributes PET radiopharmaceuticals through a nationwide network of PET
Manufacturing Distribution Centers (PMDC). We believe you have the background
and skills to make a significant contribution to our long-term success, and that
you will play an important role in helping P.E.T.Net achieve our goals and
objectives. We also believe that P.E.T.Net provides a unique environment and
career challenges that will stimulate your continued personal and professional
development.

We are offering you a comprehensive compensation package which includes the
following elements:

-        Base salary of $175,000 a year, paid every two weeks. Your salary will
         be reviewed annually by the Board of Directors of P.E.T.Net.

-        A professional expense and car allowance of $8,000 per year, paid every
         two weeks.

-        Participation in the executive incentive pay program. Basically, you
         can earn up to 120% of your base salary in incentive pay compensation.
         For a "normal" year, e.g. one in which we make plan, you could earn a
         cash bonus of 40% of base pay for the year. For a "very good" year, you
         could earn up to an additional 40% of base pay with 50% of the amount
         in cash and 50% in stock options. For an "outstanding" year, you could
         earn up to an additional 40% of base pay all of which would be in stock
         options. The number of shares in the options would be determined from
         the dollar amount of the applicable bonus and the FMV of the stock at
         the time of the award. The parameters defining a normal, very good, and
         outstanding year will be defined at the beginning of the year by the
         Officer Compensation Committee of the Board. Since our fiscal year
         began in October, this fiscal year you would earn a 40% cash bonus if
         we make plan. Since you did not participate in the plan development, we
         would guarantee a minimum cash bonus of 40% this year. The Officer
         Compensation Committee will determine any awards beyond this amount.

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-        An Incentive Stock Option grant of 800,000 P.E.T.Net shares at today's
         FMV of $2.25 per share. These 800,000 shares would be 4.6% of the
         current outstanding P.E.T.Net shares. Twenty percent of the options
         would vest on your start date and 20% would vest on each anniversary of
         your start date. Obviously, the potential for significant returns from
         the growth in value of P.E.T.Net is very high, and you will be a major
         contributor to making that happen.

-        An excellent Fringe Benefits Program, which includes a medical and
         dental plan, life insurance, and a 401(k) Plan. The P.E.T.Net Benefits
         Program provides a number of individual options, including the
         opportunity to achieve tax savings through Flexible Spending and
         Dependent Care Accounts. Our benefits are explained in more detail in
         the attachment. We have provided some additional information that will
         help to quantify the value of your personal P.E.T.Net benefits package.

-        Three weeks of vacation per year and ten paid holidays.

-        A relocation package which includes the relocation of your household
         goods with our current carrier, QuickWay Transportation, temporary
         housing for up to 90 days with Corporate Quarters, duplicate housing
         costs and a relocation allowance of $25,000. The duplicate housing
         costs payment, not to exceed $3,000 per month, will be provided after
         you move from Corporate Quarters until your present home is sold for up
         to 12 months. The relocation allowance is provided to cover transition
         expenses such as current home sale costs, new home closing costs, final
         moving trip expenses, miscellaneous items such as car tags and
         cable/phone connections, and IRS taxes on the allowance amount.

This offer is contingent on your ability to pass a physical examination and drug
screening test administered by a licensed physician designated by and
compensated by P.E.T.Net. This offer is also contingent on your agreement to
P.E.T.Net's "Guidelines for Protection of Confidential and Proprietary
Information," which are attached. You should sign and return these guidelines to
us with the signed copy of the offer letter.

In the event that, P.E.T.Net terminates your employment for any reason other
than Cause or Disability, then you shall be entitled to receive the following
payment:

P.E.T.Net shall pay you following the date of your employment termination and
over the succeeding (6) six months, in accordance with standard payroll
procedures, an amount equal to six (6) months of your Base Compensation in
effect on the date of the employment termination.

P.E.T.Net may terminate your employment for "Cause." "Cause" will exist in the
event you are convicted of a felony, or in carrying out your duties, you are
guilty of gross negligence or gross misconduct resulting, in either case in
material harm to P.E.T.Net. In the event your employment is terminated for
Cause, you will be entitled to any unpaid salary through the date of termination
due you, and you will be entitled to no other compensation hereunder from
P.E.T.Net and your deferred compensation will be forfeited.

<PAGE>

We want you to know how much we hope that you decide to join us. If you have any
questions or we can assist you in any way, please let us know.

Regards,

         /s/ Terry Douglass                       /s/ James K. Milam
-------------------------------------     -------------------------------------
Terry Douglass                            James K. Milam
President & CEO                           Human Resources Director

The undersigned accepts the above employment offer and agrees that it contains
the terms of employment with P.E.T.Net and that there are no other terms
expressed or implied

        /s/ Mark Rhoads                   Date:  February 21, 2000
-------------------------------------           -------------------------------
Mark Rhoads

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