1. School of Materials Science and Engineering; Dalian University of Technology; Dalian 116024 China
2. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road; Shenyang 110016 China
3. Department of Radiology; The First Affiliated Hospital of China Medical University; Shenyang 110001 China
4. Key Laboratory of Diagnostic Imaging and Interventional Radiology of Liaoning Province; The First Affiliated Hospital of China Medical University; Shenyang 110001 China