^○Takao Hiraki, Toshihiro Iguchi, Yusuke Matsui, Koji Tomita, Mayu Uka, Susumu Kanazawa (Department of Radiology, Okayama Univerisity Medical Shool)

^○Masanori Inoue (Department of Diagnostic Radiology Keio University Tokyo Japan)

^○hiroshi kodama, Junichi Taniguchi, Atsushi Ogasawara, Yasukazu Kako, Haruyuki Takaki, Kaoru Kobayashi, Koichiro Yamakado (Dept. of Radiology, Hyogo College of Medicine, Nishinomiya, Japan)

^○yozo sato (Department of Diagnostic and Interventional Radiology, Aichi Cancer Center, Nagoya, Japan)