1. School of Cyber Science and Engineering, Sichuan University, Chengdu, China
2. College of Computer Science, Sichuan University, Chengdu, China
3. Laboratory of Image Science and Technology, Southeast University, Nanjing, China
4. Beijing Engineering Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
5. School of Electrical Engineering Information, Sichuan University, Chengdu, China
6. Department of Radiology, West China Hospital of Sichuan University, Chengdu, China