Document:

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                                                                 Exhibit 10.9(e)

                CORRECTION TO FOURTH AMENDMENT TO LEASE AGREEMENT
                           SPECTRA OFFICE BUILDING II

         This Correction to Fourth Amendment to Lease Agreement (this
"CORRECTION") is made on February 28, 2002 between Spectra Development Company
(the "LESSOR") and NOMOS Corporation (the "LESSEE").

         WHEREAS, the Lessor and the Lessee are parties to a Fourth Amendment to
Lease Agreement, dated as of June 29, 2001 (the "FOURTH AMENDMENT"), which
amended that certain Lease Agreement among the Lessor and the Lessee dated
August 18, 1994 (as amended, the "LEASE AGREEMENT") regarding certain property
located at 2591 Wexford Bayne Road, Sewickley, Pennsylvania 15143.

         WHEREAS, the Fourth Amendment contained an error as to the termination
date of the Lease Agreement, which the parties now desire to correct.

         NOW, THEREFORE, the parties hereto, intending to be legally bound,
agree as follows:

         1. CORRECTION. Section 3(a) of the Fourth Amendment is hereby deleted
in its entirety and replaced with the following new Section 3(a):

                  " a) The Effective Term shall commence on July 1, 2001 and
         terminate on August 15, 2004. Effective date for commencement of rent
         shall be July 1, 2001."

         2. OTHER TERMS TO REMAIN IN EFFECT. Except as specifically amended by
this Correction, all other terms and conditions of the Fourth Amendment shall
remain in full force and effect.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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

WITNESS:                                SPECTRA DEVELOPMENT CO.

/s/ Susan A. Majeski                    By:   /s/ Gary A. Sippel
-----------------------------------        -------------------------------------
                                        Name:  Gary A. Sippel
                                             -----------------------------------
                                        Title:  Owner/president
                                              ----------------------------------

WITNESS:                                NOMOS CORPORATION

/s/ Jill R. Welch                       By:  /s/ David J. Haffner
-----------------------------------        -------------------------------------
                                        Name:  David J. Haffner
                                             -----------------------------------
                                        Title:  CFO
                                              ----------------------------------

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                                                                 Exhibit 10.9(e)

                       FOURTH AMENDMENT TO LEASE AGREEMENT
                           SPECTRA OFFICE BUILDING II

THIS FOURTH AMENDMENT to Lease Agreement is made the 29th day of June 2001, by
and between Spectra Development Company, (the "Lessor")

                                      A N D

The NOMOS Corporation, (the "Lessee").

                                     RECITAL
                                     -------

Lessee has leased 17,489 square feet of Rentable Area in the Spectra Office
Building II under a Lease Agreement dated August 18, 1994 (the "Lease
Agreement").

NOW THEREFORE, intending to be legally bound hereby, and for good and valuable
consideration, the parties agree to amend the Lease Agreement as follows:

1)   The Recital set forth above are incorporated herein and made a part hereof

2)   During the Effective Term of this FOURTH AMENDMENT to Lease Agreement, the
Lease, Agreement shall be amended as follows:

     a) Section 1.01 of the Lease Agreement is hereby amended to include the
following:

                2,205 square feet of rentable area (located on level four) as
        defined in Exhibit "I", attached hereto and made a part hereof

     b) Section 1.02 of the Lease Agreement is hereby amended to provide
that Rentable Area is increased by 2,205 rentable square feet for the term of
this FOURTH AMENDMENT.

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     c) Section 2.01(j) of the Lease Agreement is hereby amended to provide that
the Lessee's Percentage of Operating Expense is Increased by 6.52% for the term
of this Fourth Amendment.

     d) Section 2.01(k) of the Lease Agreement is to provide that Lessee's
Percentage of Taxes is increased by 6.52% for the term of this Fourth Amendment.

     e) Section 4.01 of the Lease Agreement is hereby amended to provide that
the monthly rental is increased by $3,583.00 for the term of this Fourth
Amendment.

3)   The Effective Term of this Fourth Amendment shall be as follows:

     a) The Effective Term shall commence on JULY 1, 2001 and terminate on
AUGUST 15,1994. Effective date for commencement of rent shall be July 1, 2001.

4)   Section 5.02 of the Lease Agreement is hereby amended to provide that the
Lessee shall pay an increase of 6.52% of the excess of Taxes and Operating
Expense from the Base Year as Additional Rent for the term of this Fourth
Amendment.

5)   Section 9.01 shall be amended to provide that all Rent shall be payable to
the Lessor or its agents at the address of Spectra Development Company at 2591
Wexford Bayne Road, Sewickley, PA 15143.

6)   Upon termination of the Effective term hereof, all of the terms and
conditions of this Fourth Amendment shall be null and void and the terms and
conditions of the Lease Agreement, (as amended by other instruments, if any)
shall be in full force and effect.

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7)   Lessor and Lessee do hereby ratify 0 other terms and conditions set forth
in the Lease Agreement which are not affected hereby and do hereby acknowledge,
agree, and affirm that all of the other terms and conditions of the Lease
Agreement are in full force and effect, except as specifically modified hereby.

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     IN WITNESS WHEREOF, the parties have set their hands and seals the day and
year first above written.

WITNESS:                                SPECTRA DEVELOPMENT CO.

/s/ Susan A. Majeski                    By: /s/ Gary A. Sippel
------------------------------             -------------------------------------
                                           Gary A. Sippel

WITNESS:                                NOMOS CORPORATION

/s/ Jill Welch                          By: /s/ John W. Manzetti
------------------------------             -------------------------------------

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                                   EXHIBIT "I"

                                  [FLOOR PLAN]<PAGE>
                                                                   Exhibit 10.10

                                NOMOS CORPORATION
                             2591 Wexford Bayne Road
                               Sewickley, PA 15143

                                February 11, 2002

John Friede
One Shore Road
Rye, NY 10580

Dear John:

         NOMOS Corporation (the "Company") considers it essential to the best
interests of its stockholders to foster the continuous employment of key
management personnel.

         In order to induce you to remain in the employ of the Company, the
Company agrees that you shall receive the severance benefits set forth in this
letter agreement (the "Agreement"). This benefit replaces and supersedes the
benefits set forth in that certain letter agreement dated June 30, 2000, between
you and the Company, which prior agreement is deemed null and void.

         1. SEVERANCE. Subject to Section 3 of this letter, you will receive a
severance payment equal to twelve months of your base salary and medical
benefits in the event your employment with the Company is terminated at any time
after this agreeement.

         2. PAYMENT TERMS. The severance payment contemplated by this Agreement
shall be payable in cash in a single lump sum within seven days after the
termination of your employment except as noted below.

         3. SEVERANCE TERMS. The severance shall be payable to you if your
employment with the Company is terminated, unless such termination is (a)
because of your death or Disability; (b) by the Company for Cause; or (c) by you
for other than Good Reason.

         4. DISABILITY. If, as a result of your incapacity due to physical or
mental illness, you shall have been absent from the full-time performance of
your duties with the Company for six (6) consecutive months, and within thirty
(30) days after written notice of termination is given you shall not have
returned to the full-time performance of your duties, your employment may be
terminated for "Disability."

         5. CAUSE. Termination by the Company of your employment for "Cause"
shall mean termination (a) upon the willful and continued failure by you to
substantially perform your duties with the Company (other than any such failure
resulting from your incapacity due to physical or mental illness), after a
written demand for substantial performance is delivered to you by the Board, or
(b) the willful engaging by you in conduct which is demonstrably and materially
injurious to the Company, monetarily or otherwise. For purposes of this Section,
no act, or failure to

<PAGE>

John Friede
February 13, 2002
Page 2

act, on your part shall be deemed "willful" unless done, or omitted to be done,
by you not in good faith and without reasonable belief that your action or
omission was in the best interest of the Company.

         6. GOOD REASON. You shall be entitled to terminate your employment for
Good Reason. For purposes of this Agreement, "Good Reason" shall mean the
occurrence of:

            (a) the assignment to you of any material duties inconsistent
     (unless in the nature of a promotion) with the position in the Company that
     you hold, or a significant adverse reduction or alteration in the nature or
     status of your position, duties, status or responsibilities or the
     conditions of your employment;

            (b) a reduction by the Company in your annual base salary as the
     same may be increased from time to time, except for across-the-board salary
     reductions similarly affecting all management personnel of the Company; and

            (c) the Company's requiring you to be based more than 50 miles from
     the location at which you were based, except for required travel on the
     Company's business to an extent substantially consistent with your present
     business travel obligations.

         7. SUCCESSORS; BINDING AGREEMENT. (i) The Company will require any
successor (whether direct or indirect, by purchase, merger, consolidation or
otherwise) to all or substantially all of the business and/or assets of the
Company to expressly assume and agree to perform this Agreement in the same
manner and to the same extent that the Company would be required to perform it
if no such succession had taken place.

         (ii) This Agreement shall inure to the benefit of and be enforceable by
you and your personal or legal representatives, executors, administrators,
successors, heirs, distributees, devisees and legatees.

         8. MISCELLANEOUS. No provision of this Agreement may be modified,
waived or discharged unless such waiver, modification or discharge is agreed to
in writing and signed by you and such officer as may be specifically designated
by the Board. No waiver by either party hereto at any time of any breach by the
other party hereto of, or compliance with, any condition or provision of this
Agreement to be performed by such other party shall be deemed a waiver of
similar or dissimilar provisions or conditions at the same or at any prior or
subsequent time. No agreements or representations, oral or otherwise, express or
implied, with respect to the subject matter hereof have been made by either
party which are not expressly set forth in this Agreement. The validity,
interpretation, construction and performance of this Agreement shall be governed
by

<PAGE>

John Friede
February 13, 2002
Page 3

the laws of the Commonwealth of Pennsylvania without regard to its conflicts of
law principles.

         9. VALIDITY. The invalidity or unenforceability of any provision of
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement, which shall remain in full force and effect.

         10. COUNTERPARTS. This Agreement may be executed in several
counterparts, each of which shall be deemed to be an original but all of which
together will constitute one and the same instrument.

         11. ENTIRE AGREEMENT. This Agreement sets forth the entire agreement of
the parties hereto in respect of the subject matter contained herein and
supersedes all prior agreements, promises, covenants, arrangements,
communications, representations or warranties, whether oral or written, by any
officer, employee or representative of any party hereto; and any prior agreement
of the parties hereto in respect of the subject matter contained herein is
hereby terminated and cancelled.

         If this letter sets forth our agreement on the subject matter hereof,
kindly sign and return to the Company the enclosed copy of this letter, which
will then constitute our agreement on this subject.

                                        Sincerely,

                                        NOMOS CORPORATION

                                        By:   /s/ John W. Manzetti
                                           -------------------------------------
                                        Name:  John W. Manzetti
                                        Title:  President

Agreed to this 28TH day of MARCH, 2002

         /s/ John A. Friede
--------------------------------------
Name:     John A. Friede

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