^○Shohei Mizushima¹, Takahiko Mine¹, Seigo Happo¹, Takeshi Kashimura¹, Kohei Ishikawa², So Ueshima², Hisashi Matsumoto² (1.Department of Radiology, Nippon Medical School Chiba Hokusoh Hospital, Chiba, Japan, 2.Department of Emergency, Nippon Medical School Chiba Hokusoh Hospital, Chiba, Japan)

^○Kiichi Watanabe^1,3, Ryo Morita¹, Daisuke Abo¹, Takeshi Soyama¹, Yuki Yoshino¹, Naoya Kinota¹, Fumi Kato¹, Yasuo Sakurai³, Yoshihisa Kodama³, Kohsuke Kudo² (1.Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, 2.Department of Diagnostic Imaging, Hokkaido University Graduate School Medicine, 3.Department of Diagnostic and Interventional Radiology, Teine Keijinkai Hospital)

^○Kazuhiko Nakamura, Chie Inoue, Eiji Matsuse (The Department of Radiology, Tottori Prefectural Central Hospital)