1. Graduate School of Biomedical Science and Engineering Hokkaido University Sapporo Hokkaido Japan
2. Department of Medical Physics Hokkaido University Hospital Sapporo Hokkaido Japan
3. Research and Development Group Hitachi Ltd Hitachi Ibaraki Japan
4. Division of Quantum Science and Engineering, Faculty of Engineering Hokkaido University Sapporo Hokkaido Japan
5. Department of Radiation Oncology Faculty of Medicine Hokkaido University Sapporo Hokkaido Japan
6. Global Center for Biomedical Science and Engineering Faculty of Medicine Hokkaido University Sapporo Hokkaido Japan