1. Kawasaki University of Medical Welfare Department of Radiological Technology, Faculty of Health Science and Technology, , 288, Matsushima, Kurashiki, Okayama 701-0193 , Japan
2. Kumamoto University Department of Medical Physics, Faculty of Life Sciences, , Kumamoto, 1-1-1 Honjo, Kumamoto 860-8556 , Japan
3. Kumamoto University Department of Diagnostic Radiology, Graduate School of Medical Sciences, , 1-1-1 Honjo, Kumamoto 860-8556 , Japan
4. Tsuchiya General Hospital Department of Diagnostic Radiology, , Nakajima-cho 3-30, Naka-ku, Hiroshima 730-8655 , Japan
5. Tsuchiya General Hospital Department of Pediatric Cardiology, , Nakajima-cho 3-30, Naka-ku, Hiroshima 730-8655 , Japan
6. Hiroshima University Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, , Kasumi 1-2-3 Minami-ku, Hiroshima 734-8551 , Japan
7. Tsuchiya General Hospital Department of Radiological Technologist, , Nakajima-cho 3-30, Naka-ku, Hiroshima 730-8655 , Japan