1. Department of Diagnostic Radiology, National Cheng Kung University Hospital, College of Medicine, National
Cheng Kung University, Tainan 701, Taiwan
2. Association of Radiological Technologists of Tainan City, Tainan 704,
Taiwan
3. Department of Medical Imaging and Radiology, Shu-Zen Junior College of Medicine and Management,
Kaohsiung City 821, Taiwan