Siqi Wang1,2, Yan Chen1,2, Lu Wang3, Huan Liu4, Ping Han1,2. 1. Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology. 2. Hubei Province Key Laboratory of Molecular Imaging. 3. Department of Infectious Diseases, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan. 4. Advanced Application Team, GE Healthcare, Shanghai, China.