^○Akira Akutsu¹, Atushi Saiga¹, Hajime Yokota², Yoshihiko Ooka³, Yoshihiro Kubota¹, Takeshi Wada¹, Takashi Takeuchi¹, Takuro Horikoshi¹, Takashi Uno² (1.Department of radiology, Chiba University Hospital, Chiba, Japan, 2.Department of Diagnostic Radiology and Radiation Oncology, Graduate School of Medicine, Chiba, Japan, 3.Department of Gastroenterology, Chiba University Hospital, Chiba, Japan)

^○Toru Saguchi¹, Shoichi Ikenaga¹, Taro Tanaka¹, Jun Otaka¹, Natsuhiko Shirota¹, Eri Arizono¹, Mika Muraki¹, Kazuhiro Saito¹, Yuki Takara², Daisuke Yunaiyama², Tomonaga Moriya³ (1.The Department of Radiology, Tokyo Medical University, Tokyo, Japan, 2.The Department of Radiology, Tokyo Medical University Hachioji Medical Center, 3.The Department of Radiology, Tokyo Medical University Ibaraki Medical Center)

^○Yasuo Sakurai, Yoshihisa Kodama, Koji Yamazaki (Diagnostic Radiology,Teine-Keijinkai Hospital,Sapporo,Japan)

^○Toshiyuki Irie¹, Nobuyuki Takahashi² (1.Department of Radiology, Tsukuba University Hospital Mito Clinical Education and Training Center, Mito Kyodo General Hospital, 2.Department of Radiology, Tsukuba Memorial Hospital)

^○Miyuki Maruno, Hiro Kiyosue, Satomi Ide (Department of Radiology, Oita University Faculty of Medicine, Yufu, Japan)

^○Yuto Chanoki¹, Kaoru Myouchin¹, Katsutoshi Takayama², Takeshi Wada², Ichiro Nakagawa³, Hiroyuki Nakase³, Kimihiko Kichikawa¹ (1.Department of Radiology and IVR Center, Nara Medical University, Kashihara, Japan, 2.Department of Radiology and Interventional Neuroradiology, Ishinkai Yao General Hospital, Yao, Japan, 3.Department of Neurosurgery, Nara Medical University, Kashihara, Japan)

^○Masahiro Horikawa^1,2, Kosuke Kumagai^1,3, Kentaro Yamada¹, Younes Jahangiri¹, Aclan Dogan^1,4, Jesse Liu^1,4, Ryan Priest¹ (1.Charles T. Dotter Department of Interventional Radiology, Oregon Health & Science University, Portland, USA, 2.Qualityrad IVR Inc., 3.Department of Neurosurgery, National Defense Medical College, 4.Department of Neurosurgery, Oregon Health & Science Univeristy)