1. Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
2. Shenzhen Key Laboratory of Ultrasound Imaging and Therapy, Shenzhen 518055, China
3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
4. Department of Physics, University of Vermont, Burlington, Vermont 05405, USA