^○Naoto Kawaguchi¹, Hiroaki Tanaka¹, Teruhito Mochizuki¹, Muneaki Ohsita² (1.Department of Radiology, Ehime University Graduate School of Medicine, Toon, Japan, 2.Department of Emergency and critical care medicine, Ehime University Graduate School of Medicine, Toon, Japan)

^○Hidemasa Kikuchi¹, Syusuke Kasuya², Takamitsu Uchi², Tomoya Nakatsuka², Rumiko Ishikawa², Noriko Kitamura², Tsutomu Inaoka², Akihiro Yamada¹, Kentarou Nakamura¹, Katsuyoshi Matsuoka¹, Hitoshi Terada² (1.Division of gastroenterology, Sakura Medical Center Faculty of Medicine, Toho University, Chiba, Japan, 2.Radiology, Sakura Medical Center Faculty of Medicine, Toho University, Chiba, Japan)

^○Akira Imaizumi, Takuji Araki, Hiroki Okada, Yu Sasaki, Hiroto Imaimatsu, Hiroshi Onishi (Department of Radiology, University of Yamanashi, Yamanashi, Japan)

^○Kenji Takata, Satomi Kanai, Kiyotaka Takeuchi, Kazuyuki Kinoshita, Toyohiko Sakai, Hirohiko Kimura (The Department of Radiology, Univercity of Fukui hospital, Fukui, Japan)

^○Hiroki Yoshikawa¹, Jitsuro Tsukada², Shigeyoshi Soga³, Hideyuki Torikai⁴, Yohsuke Suyama³, Sayuri Kodama¹, Hiromi Watanabe¹, Kiyoshi Ohkuma¹, Hiroshi Shinmoto³, Masahiro Jinzaki⁴ (1.Department of Diagnostic Radiology, Saitama City Hospital, Saitama, Japan, 2.Department of Radiology, Nihon University School of Medicine, Tokyo, Japan, 3.Department of Radiology, National Defense Medical College, Saitama, Japan, 4.Department of Diagnostic Radiology, Keio University School of Medicine, Tokyo, Japan)