1. Department of Ultrasound in Medicine
2. Shanghai Tenth People's Hospital
3. Tongji University School of Medicine
4. Shanghai 200072
5. People's Republic of China
6. State Key Laboratory of High Performance Ceramics and Superfine Microstructures
7. Shanghai Institute of Ceramics
8. Chinese Academy of Sciences
9. Shanghai 200050
10. State Key Laboratory of Molecular Engineering of Polymers
11. Fudan University
12. Shanghai 200433