1. Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, No. 155, Sec. 2, Linong Street, Taipei 112, Taiwan
2. Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, No. 325, Sec. 2, Cheng-Kong Road, Neihu, Taipei 114, Taiwan
3. Department of Electrical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan
4. Imaging Research Center, Taipei Medical University, No. 250, Wu-Hsing Street, Taipei 110, Taiwan
5. Department of Radiological Sciences, University of California at Irvine Medical Center, Irvine, 101 The City Drive South, Orange, CA 92868, USA