1. From the Departments of Radiology (G.W., G.L., S.P., Y.L., J.X.) and Urology (J.W., Y.X., W.K., W.X., J.Z.), Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Pujian Rd, 200127 Shanghai, China; and Clinical & Technical Solutions, Philips Healthcare, Beijing, China (P.S.).