1. Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Biomedical Intelligent Cloud Research and Development Center, National Institute for Data Science in Health and Medicine, Xiamen University, Xiamen, China
2. School of Computer and Information Engineering, Xiamen University of Technology, Xiamen, China
3. United Imaging Research Institute of Intelligent Imaging, Beijing, China
4. Department of Nuclear Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
5. Department of Biomedical Engineering, Oden Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, TX, USA