1. Department
of Electronic Engineering, The Chinese University of Hong Kong, New Territories, Hong Kong
2. National-Regional
Key Technology Engineering Laboratory for Medical Ultrasound, School
of Medicine, Shenzhen University, Shenzhen, China
3. Institute
of Materials Research and Engineering, Agency for Science, Technology and Research, Singapore 117602, Singapore
4. Department
of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong