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Delineation of viable ischemic myocardium is an important problem in nuclear cardiology. To determine the feasibility of using a technetium-labeled nitroimidazole as an indicator of ischemic myocardium at risk of infarction, we characterized the distribution of a 2-nitroimidazole-derivatized PnAO ligand and its 99m Tc complex, 99m TcO(PnAO)-1-CH 2 -(2NI)...