title: Radioiodine therapy of hyperthyroidism precludes thallium-201 myocardial scintigraphy.
abstract: The authors attempted to perform Tl-201 myocardial perfusion scintigraphy in a 42-year-old man 23 and 35 days after he received 9.8 mCi of oral I-131 for documented Graves' disease. Interference from primary and scattered photons from residual thyroid I-131 made Tl-201 myocardial scintigraphy technically impossible. A series of phantom and patient studies using I-131 and Tl-201 were performed, yielding guidelines for planning Tl-201 myocardial scintigraphy following radioiodine therapy.
mesh_terms: D000328:Adult; D006111:Graves Disease / Q000532:radiotherapy*; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use*; D008297:Male; D009203:Myocardial Infarction / Q000000981:diagnostic imaging*; D011868:Radioisotopes; D011877:Radionuclide Imaging; D013793:Thallium; D013961:Thyroid Gland / Q000000981:diagnostic imaging
chemical_list: D007457:Iodine Radioisotopes; D011868:Radioisotopes; D013793:Thallium