1. Graduate School of Biomedical Science and Engineering Hokkaido University Sapporo Hokkaido Japan
2. Faculty of Engineering Hokkaido University Sapporo Hokkaido Japan
3. Proton Beam Therapy Center Hokkaido University Hospital Sapporo Hokkaido Japan
4. Global Station for Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education (GI‐CoRE) Hokkaido University Sapporo Japan