1. Department of Radiology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, PR China

2. Department of Biomedical Engineering, the Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi’an, PR China

3. The Third Hospital of Hebei Medical University, the Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi’an, PR China