A radiopharmaceutical composed of the nonspecific perfusion agent ethylglyoxal bis(thiosemicarbazone) (ETS) linked to the beta-emitting, radioisotope copper Cu 62, with potential tumor imaging activity upon positron emitting tomography (PET). Upon injection, copper Cu 62-ETS distributes to various organs, especially the kidneys and the myocardium. Upon PET imaging, tumor blood flow can be visualized and the efficacy of antineoplastic and anti-angiogenic chemotherapeutics can be assessed. Cu62-ETS has a short half life of 9.74 minutes. ETS has an enhanced hyperemic response compared to other perfusion agents.