放医研HIMACの現状報告（2020）

Carbon-ion radiotherapy using the Heavy-Ion Medical Accelerator in Chiba (HIMAC) at the National Institute of Radiological Sciences (NIRS) has been conducted on more than 12,000 patients since 1994. We started the heavy-ion radiotherapy with a 3D scanning irradiation system in 2011 and using a superconducting rotating gantry in 2017, at a new treatment research facility in NIRS. We have continued some R&Ds on HIMAC to enhance the treatment quality and to improve the treatment results. From 2016, we have started developments of a compact superconducting rotating gantry and synchrotron to be applied for a newly started project of a “quantum scalpel” that is a next generation of the heavy-ion radiotherapy machine. This paper outlines those R&Ds as well as the present status of HIMAC facility.