1. Department of Digital Multimedia Technology, Vanung University, Chung-Li, 32061, Taiwan
2. Department of Electronics Engineering, Feng-Chia University, Taichung, Taiwan, 40724
3. Department of Electronic Engineering, Chang Gung University, Taoyuan, 33302, Taiwan
4. Department of Electronic Engineering, Chang Gung University, Taichung, Taiwan, 40724; Departments of Radiation Oncology, Chang Gung Memorial Hospital, LinKou, 33302, Taiwan; and The College of Engineering, Ming Chi University of Technology, Taishan, 24301, Taiwan