^○Shingo Hamaguchi, Hidefumi Mimura (Department of emergency and critical care medicine, St Marianna university school of medicine, Kawasaki, Japan.)

^○Tomonori Murakami (Department of Radiological Science, Nagasaki University Graduate School of Biomedical Sciences)

^○Shuichi Tanoue, Norimitsu Tanaka, Masamichi Koganemaru, Asako Kuhara, Tomoko Kugiyama, Toshi Abe (Department of Radiology, Kurume University School of Medicine)

^○Motoki Nakai, Akira Ikoma, Atsufumi Kamisako, Tetsuo Sonomura (Department of Radiology, Wakayama Medical University, Wakayama, Japan)

^○hideki ishimaru (Department of Radiology, Nagasaki University Hospital)