PARTICLE BEAM THERAPY SYSTEM, AND METHOD FOR OPERATING PARTICLE BEAM THERAPY SYSTEM

摘要

When a beam acceleration high frequency control section turns on an accelerating cavity in synchronization with a beam irradiation on state, the beam acceleration high frequency control section rapidly increases an amplitude value of an applied voltage of the accelerating cavity. The control section rapidly decreases the amplitude value of the applied voltage of the accelerating cavity before beam irradiation off timing. When the control section turns off the accelerating cavity, the control section gradually decreases the amplitude value of the applied voltage of the accelerating cavity before the irradiation off timing. When the control section turns on the accelerating cavity and starts the beam irradiation, the control section gradually increases the applied voltage of the accelerating cavity.

主权项

1. A particle beam radiotherapy system, comprising:
a synchrotron that accelerates and emits a charged particle beam; an irradiation unit that irradiates an irradiation target with the charged particle beam emitted from the synchrotron; a beam transport that transports the charged particle beam from the synchrotron to the irradiation unit; and a control unit that controls the synchrotron, the beam transport, and the irradiation unit, wherein the synchrotron includes an accelerating cavity that accelerates the charged particle beam at a high frequency acceleration voltage until the charged particle beam has predetermined energy and an extraction unit that extracts the charged particle beam from the synchrotron, and wherein the control unit includes a beam acceleration high frequency control section that decreases an amplitude value of a high frequency voltage applied to the accelerating cavity while the extraction unit performs extraction control for the charged particle beam.