1. Shenzhen Institute of Advanced Technology, Paul C. Lauterbur Research Center for Biomedical Imaging, Chinese Academy of Sciences, Shenzhen, China
2. Department of Nuclear Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
3. Central Research Institute, United Imaging Healthcare Group, Shanghai, China
4. Department of Mechanical Engineering and Department of Computer Science, Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Canada