[1] Yamaguchi Univ, Sch Med, Dept Radiol, Ube, Yamaguchi 7558505, Japan
[2] Kyoto Univ, Grad Sch Med, Dept Nucl Med, Sakyo Ku, Kyoto 6068507, Japan
[3] Kyoto Univ, Grad Sch Med, Dept Diagnost Imaging, Sakyo Ku, Kyoto 6068507, Japan
[4] Otsu Red Cross Hosp, Dept Radiol, Otsu, Shiga 5208511, Japan