From the Department of Radiology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8521, Japan (S. Iwakoshi, T.N., S. Ichihashi, K.K.); University of Arizona Health Sciences, Tucson, Ariz (M.D.D.); Department of Cardiovascular Surgery, Iwaki City Medical Center, Iwaki, Japan (Y.I., Y. Katada); Department of Radiology, Matsubara Tokusyukai Hospital, Matsubara, Japan (S.S.); Department of Radiology, Oita University Faculty of Medicine, Yufu, Japan (N.H., K.O.); Department of Radiology, National Cerebral and Cardiovascular Center, Suita, Japan (T.F.); Department of Cardiovascular Surgery, National Cerebral and Cardiovascular Center, Suita, Japan (H.M.); Department of Radiology, Hyogo Brain and Heart Center, Himeji, Japan (R.K.); Department of Radiology, Tenri Hospital, Tenri, Japan (T.T.); Department of Cardiovascular Surgery, Morinomiya Hospital, Osaka, Japan (M.M.); Department of Radiology, Aichi Medical University, Nagakute, Japan (M.H.); Department of Cardiovascular Surgery, Teine Keijinkai Hospital, Sapporo, Japan (Y. Kurimoto); Division of Vascular Surgery, Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan (N. Morikage); Department of Cardiovascular Surgery, Cardiovascular Surgery, St. Marianna University School of Medicine, Kawasaki, Japan (H.N.); Department of Radiological Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan (E.S.); Department of Cardiovascular Surgery, Kobe Rosai Hospital, Kobe, Japan (K.I.); Department of Cardiovascular Surgery, Keio University, Tokyo, Japan (H.S.); Department of Cardiovascular Medicine & Surgery, Division of Cardiovascular Surgery, Saiseikai Kumamoto Hospital, Kumamoto, Japan (I.I.); Department of Radiology, Mie University Hospital, Tsu, Japan (T.H.); Department of Diagnostic Radiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (O.I.); Department of Radiology, Kita-Harima Medical Center, Ono, Japan (N. Miyamoto); Department of Radiology, Wakayama Medical University, Wakayama, Japan (M.N.); Department of Central Radiology, Nara Medical University, Kashihara, Japan (Takeshi Inoue); Institute for Clinical and Translational Science, Nara Medical University, Kashihara, Japan (Takashi Inoue); Department of Radiology, Kobe University Graduate School of Medicine, Kobe, Japan (M.Y.); and Department of Radiology, Iwate Medical University, Morioka, Japan (K.K.).