The compound O-(4-iodophenyl)choline iodide has been synthesized using iodine-125, iodine-127, and iodine-131 by diazonium salt and melt exchange procedures. Radiochemical yields of approximately 2% and 56%, respectively, were obtained. The biodistribution of this compound in mice was analyzed in order to determine its potential as a myocardial imaging agent. Selective myocardial concentration was observed at 5 min post-injection, with a heart-to-blood ratio of 18:1.