Lesion Dosimetry With Iodine-124 in Metastatic Thyroid Carcinoma

Up to four whole-body PET scans (approximately 24, 48, and 120 hours post 124I oral dose) will be performed on one of the GE Discovery 710 or 690 PET scanners.

Patients will receive 0.9 mg injections of rhTSH on two consecutive days. Twenty-four hours after the last injection of rhTSH each patient will receive approximately 5 mCi (range: 4-7 mCi) of 124I orally as a single dose. (If a holiday is present in the work week, 124I can be administered orally on Day 2, if needed).