1Department of Radiology, Peking University First Hospital, Beijing, China, People's Republic of, 2Department of Urology, Peking University First Hospital, Beijing, China, People's Republic of, 3Center for medical device evaluation, China Food and Drug Administration, Beijing, China, People's Republic of, 4Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China, People's Republic of, 5Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States