1. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
2. Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen, China
3. Department of Electronic Information Engineering, Nanchang University, Nanchang, China
4. Department of Biomedical Engineering, University of California, Davis, CA, USA