1. The
Institute of Ultrasound Engineering in Medicine, Chongqing Medical University, 1 Yi-xue-yuan Road, Chongqing 400016, P.R. China
2. Department
of Medical Ultrasound, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Tongji University, 301 Yan-chang-zhong Road, Shanghai 200072, P. R. China
3. State
Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P.R. China
4. Department
of Imaging and Interventional Radiology, the Central Hospital of Xuhui District, 966 Huai-hai-zhong Road, Shanghai 200031, P.R. China