1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; 1295 Ding-xi Road Shanghai 200050 P. R. China
2. Department of Radiology; Shanghai Cancer Hospital; Fudan University; 270 Dong-an Road Shanghai 200032 P. R. China
3. Department of Radiology; Huashan Hospital; Fudan University; 12 Urumqizhong Road Shanghai 200040 P. R. China