1. Department of Electrical Engineering, National Chung Hsing University, Taichung, Taiwan
2. Department of Computer Science and Electrical Engineering, Remote Sensing Signal and Image Processing Laboratory, University of Maryland, Baltimore County, Baltimore, MD, USA
3. Department of Radiology, Taichung Veterans General Hospital, Taichung, Taiwan
4. Department of Medical Research, Center for Quantitative Imaging in Medicine (CQUIM), Taichung Veterans General Hospital, Taichung, Taiwan
5. Department of Medical Imaging, China Medical University Hospital, Taichung, Taiwan