1. Quantum Energy Applications, Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan
2. Division of Radiology and Nuclear Medicine, Sapporo Medical University Hospital, South 1, West 17, Chuo-ward, Sapporo, Hokkaido, Japan
3. Department of Radiation Oncology, Graduate School of Medicine, Sapporo Medical University, South 1, West 16, Chuo-ward, Sapporo, Hokkaido, Japan
4. Department of Radiology, Graduate School of Medicine, Osaka University, 2-2 Yamada-oka, Suita, Osaka, Japan
5. Auckland City Hospital, Park Rd, Grafton, Auckland 1142, New Zealand