1. Department of Biomedical Engineering, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, People’s Republic of China;
2. Medical Engineering Division, Beijing HuiLongGuan Hospital, Beijing, People's Republic of China;
3. Department of Radiology, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, People’s Republic of China