1 From the Department of Radiology, Peking University Shenzhen Hospital, 1120 Lianhua Rd, Futian District, Shenzhen 518036, China (X.H., Z.Y.); and Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China (X.H.).