1. Department of Radiological Technology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, Hiroshima 730-8655, Japan.
2. Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan.
3. Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.
4. Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan.
5. Department of Diagnostic Radiology, Tsuchiya General Hospital, Hiroshima, Japan.
6. Department of Cardiovascular Internal Medicine, Tsuchiya General Hospital, Hiroshima, Japan.