^○Ryusei Zako, Hiroshi Kondo, Masayoshi Yamamoto, Toshimasa Sugawara, Akiyoshi Suzuki, Suguru Hitomi, Takuya Hara, Kotaro Yamamoto, Mizuki Ozawa, Hiroshi Oba (The deptment of Radiology, Teikyo University School of Medicine, Tokyo, Japan)

^○Ryo Aoki, Toh Yamamoto, Shintaro Nawata, Hiroyuki Kamide, Zenjiro Sekikawa (Departments of Diagnostic Radiology, Yokohama City University Medical Center, Yokohama, Japan)

^○Masashi Ebara^1,2, Hideo Morita², Takakazu Komatsu², Terutaka Yoshihara¹, Hisao Yajima³, Soma Kumasaka¹, Masaya Miyazaki⁴, Yoshito Tsushima¹ (1.Department of Diagnostic Radiology, Interventional Radiology and Nuclear Medicine, Gunma University Hospital, Maebashi, Japan, 2.Department of Diagnostic Radiology, Japanese Red Cross Maebashi Hospital, Ma ebashi, Japan, 3.Department of Emergency Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan, 4.Department of Applied Medical Imaging, Gunma University Graduate School of Medicine, Maebashi, Japan)

^○Shintaro Furugori¹, Yukitoshi Toyoda¹, Satomi Seno¹, Yukio Inoue², Kouzo Sato², Tomohiro Funabiki¹ (1.Department of Emergency and Critical Medicine, SAISEIKAI YOKOHAMASHI TOBU HOSPITAL, 2.Department of Diagnostic Radiology, SAISEIKAI YOKOHAMASHI TOBU HOSPITAL)

^○Takeshi Fukunaga, Hiroki Nakamura, Akira Yamamoto, Akihiko Kanki, Atsushi Higaki, Tsutomu Tamada (Department of Radiology, Kawasaki Medical School, Kurashiki City, Okayama, Japan)

^○Makoto Aoki^1,2, Hiroyuki Tokue², Hisao Yajima^1,2, Terutaka Yoshihara², Masashi Ebara², Kei Shibuya², Masaya Miyazaki² (1.Department of Emergency Medicine, Gunma University Graduate School of Medicine, Maebashi, Japan, 2.Department of Diagnostic and Interventional Radiology, Gunma University Graduate School of Medicine, Maebashi, Japan)

^○Kenichiro Ihara, Munemasa Okada, Masahiro Tanabe, Etsushi Iida, Tetsuro Komatsu, Kouji Narikiyo, Masaya Tanabe, Katsuyoshi Ito (Department of Radiology, University of Yamaguchi, Yamaguchi, Japan)