exhibit 10. 49 notice and acknowledgement of assignment may 5, 2003 mobile pet systems, inc. 2510 west washington street san diego, ca ladies and gentlemen : this will advise you that we have assigned all our interest in three ( 3 ) separate equipment leases identified as equipment lease no. 4125, lease schedules no. 4125. 01, 4125. 02 and 4125. 03a, all dated as of april 8, 1999 ( collectively, the “ lease ” ) between finova capital corporation ( “ lessor ” or “ assignor ” ) and molecular imaging corporation ( formerly mobile pet systems, inc. ) ( “ lessee ” ), and proceeds thereof, to ascendiant pet partners – i, llc ( “ purchaser ” ), and purchaser has agreed to assume such leases. in addition, this letter shall constitute lessee ’ s representation, acknowledgment and agreement as to the following : 1. the lease is in full force and effect, and has not been modified, altered or amended and a true and correct copy of the lease is attached hereto. the lease is enforceable against the lessee in all of its terms. 2. there are no offsets or credits against installment payments, or other concessions, nor have payments been prepaid. 3. after payment of the may 1, 2003 rental, there are fourteen ( 14 ) rental payments in the amount of $ 113, 242. 47 remaining. no rents have been prepaid. 4. lessee has no notice of a prior assignment, hypothecation or pledge of payments on the lease. 5. lessee ’ s obligations to make payments under the lease are absolute and unconditional and not subject to any deductions, abatement, set - off, defense or counterclaim for any reason whatsoever. 6. without the written consent of purchaser, lessee shall not ( a ) modify, extend or in any manner alter the terms of the lease ; ( b ) pay any other sums becoming due under the terms of the lease more than one month in advance ; ( c ) accept assignor ’ s waiver of, or release from the performance of any obligations under the lease. in addition, upon the consummation of the purchase and assignment agreement dated may 5, 2003 between assignor and purchaser ( the “ purchase agreement ” ), including the receipt by assignor of the purchase price ( as defined therein