1. From the Department of Radiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajiicho, Kawaramachi Hirokoji, Kamigyoku, Kyoto 602-8566, Japan (M.G., M.Y., K.S., K.Y.); and NeuroSpin, Gif-sur-Yvette, France (D.L.B.).