1. From the Imaging Science Laboratories (J.H.F.R., K.S.M., Z.A.F.), Cardiovascular Imaging Clinical Trials Unit (S.B., M.E.F.), Division of Nuclear Medicine (J.M.), Department of Radiology, Department of Medicine (M.W.), and The Zena and Michael A. Wiener Cardiovascular Institute and Marie Josée and Henry R. Kravis Cardiovascular Health Center (V.F.), Mount Sinai School of Medicine, New York, NY.