^○Kohei Tokuyama¹, Hiro Kiyosue², Ryuichi Shimada¹, Satomi Ide¹ (1.Department of Radiology, Oita University Faculty of Medicine, Oita, Japan., 2.Department of Radiology, Oita University Faculty of Medicine, Oita, Japan.)

^○Shunsuke Kisaki¹, Hirokazu Ashida¹, You Matsui², Youhei Munetomo¹, Yasuaki Hasegawa¹, Hiroya Ojiri¹ (1.The Jikei University Hospital, 2.Tokyo Shinagawa Hospital,Tokyo,Japan)

^○Sachiko Fukuzato, Takahiro Muranaka, Yuhei Kawasaki, Kenichirou Yamaguchi, Takao Kodama (Miyazaki Prefectural Miyazaki Hospital,Miyazaki,Japan)

^○Misato Sone¹, Akio Tamura¹, Sohei Yoshida¹, Manabu Nakayama¹, Mitsuru Izumisawa¹, Kenichi Kato¹, Kunihiro Yoshioka¹, Kiyoto Shiga², Katsunori Katagiri², Yu Ohashi², Kuniaki Ogasawara³, Kenji Yoshida³ (1.The Department of Radiology, Iwate Medical University, Iwate, Japan, 2.The Department of Head and Neck Surgery, Iwate Medical University, Iwate, Japan, 3.The Department of Neurosurgery, Iwate Medical University, Iwate, Japan)

^○Mika Kamiya¹, Hisaya Hiramatsu², Satoru Kida², Muneaki Hashimoto³, Yasuhiro Yamamura³, Mamoru Tomita³, Seiya Takehara³ (1.Department of diagnostic and interventional radiology, Yaizu City Hospital, Shizuoka, Japan, 2.Department of neurosurgery, Hamamatsu University School of Medicine, Hamamatsu, Japan, 3.Department of neurosurgery, Yaizu City Hospital, Shizuoka, Japan)

^○Kazuhiro Hayashi¹, Noriaki Sakamoto¹, Sumire Tagawa¹, Akihito Ohnishi¹, Masahide Nobuhara¹, Tetsu Nakamura¹, Mamoru Hase¹, Akira Tachibana² (1.Department of Diagnostic and Interventional Radiology,Kakogawa Central City Hospital, 2.Department of Oral Maxillofacial Surgery,Kakogawa Central City Hospital)

^○Yoko Usami¹, Norifumi Otani², Shigeru Koshiba³, Masaru Takagi⁴ (1.Sapporo Teishinkai Hospital, Therapeutic Radiology, 2.Sapporo Teishinkai Hospital Cardiovascular surgery, 3.Sapporo Teishinkai Hospital Head and Neck surgery, 4.Sapporo Teishinkai Hospital Radiation Oncology)