1. From the Biomedical Engineering Center, Fudan University, Shanghai, China (W.Y., Y.W.); Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (L.H., L.X.); Department of Radiology, Ruijin Hospital, Shanghai Jiaotong University, Shanghai, China (S.G., F.Y.); and Division of Image Processing, Department of Radiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, the Netherlands (Q.T.).