1. From the Department of Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-city, Osaka 565-0871, Japan (M.Y., M.T., Y.S., A.H., T.M., Y.Y., N.K., N.T.); and Department of Medical Innovation, Osaka University, Suita-city, Osaka, Japan (H.K.).