1. Department of Ultrasound West China Hospital of Sichuan University Chengdu610041China
2. School of Optoelectronic Engineering Chongqing University of Posts and Telecommunications Chongqing400065China
3. Shenzhen Mindray Bio‐medical Electronics Co., Ltd. Shenzhen518057China
4. School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054China
5. Department of Medical Engineering University of South Florida Tampa33620USA