1. From the Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan (K.O., Y.M., H.A., H.U., K.N., S. Morosawa, M.H., S. Miyata, J.T., K.I., H.S.); and Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan (H.W., Y.F.).