1. Division of Clinical Radiology Service, Kyoto University Hospital , 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto 606-8507 , Japan
2. Department of Information Technology and Medical Engineering, Human Health Sciences , Graduate School of Medicine, , 53 Kawaharacho, Shogoin, Sakyo-ku, Kyoto 606-8397 , Japan
3. Kyoto University , Graduate School of Medicine, , 53 Kawaharacho, Shogoin, Sakyo-ku, Kyoto 606-8397 , Japan
4. Department of Radiation Oncology and Image-Applied Therapy, Graduate School of Medicine , 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto University, Kyoto 606-8507 , Japan