1. Medical Imaging Department, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China
2. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130000, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. School of Biomedical Engineering, Capital Medical University, Beijing 100069, China