Koichi Onodera¹, Naoya Yama¹, Mitsuhiro Nakanishi², Masamitsu Hatakenaka¹ (1.Department of Diagnostic Radiology, School of Medicine, Sapporo Medical University, 2.Division of Radiology, Sapporo Medical University Hospital)

Hironori Kurokawa, Atsushi Okamura, Shumiyo Iwata (Mitoyo General Hospital, Department of Radiology)

Koichi Oshio¹, Hiroshi Shinmoto² (1.Department of Diagnostic Radiology, Keio University School of Medicine, 2.Department of Radiology, National Defense Medical College)

Taro Igarashi¹, Mitsuyuki Takahashi², Hiroki Hori³, Tetsuichi Hondera⁴ (1.Keiyu Hospital, 2.Yokohama Sakae Kyousai Hospital, 3.SHIN-YURIGAOKA General Hospita, 4.Showa University Fujigaoka Hospital)

Hajime Tamura¹, Akiko Shimauchi², Naoko Mori³, Tatsuo Nagasaka⁴, Hideki Ota³ (1.Division of Medical Physics, Tohoku University Graduate School of Medicine, 2.Kameda Kyobashi Clinic, 3.Diagnostic Radiology, Tohoku University Graduate School of Medicine, 4.Radiology, Tohoku University Hospital)

Yuichi Suzuki¹, Hirotaka Hasegawa², Minoru Mitsuda¹, Akihiro Kasahara¹, Kanako Matsuda¹, Takeo Sarashina¹, Yasushi Watanabe¹, Kenji Ino¹, Masahiro Shin², Jiro Sato¹, Keiichi Yano¹, Nobuto Saito², Akira Kunimatsu¹ (1.The University of Tokyo Hospital, Department of Radiology, 2.The University of Tokyo Hospital, Department of Neurosurgery)