1 Bohai Ship-building Vocational College, Huludao 125000, Liaoning, P. R. China
2 CAS Key Laboratory of Bio-Medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, P. R. China
3 Jilin Weather Modification O±ce, Changchun 130062, Jilin, P. R. China
4 School of Science, Changchun University of Science and Technology, Changchun 130022, Jilin, P. R. China
5 Department of Ultrasound, China-Japan Union Hospital, Jilin University, Changchun 130033, Jilin, P. R. China
6 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, P. R. China