Patent ID: 8916841
Filing Date: 2014-12-23
Classification: A61N

Abstract:
1. A particle therapy system comprising: an accelerator that accelerates an ion beam to a preset energy level; an irradiation device that irradiates an irradiation target with the accelerated ion beam; a beam transport system that transports the ion beam extracted from the accelerator to the irradiation device; and an irradiation control apparatus that controls, in a period in which the accelerator performs an energy scan operation of successively changing by increasing or decreasing stepwise the energy level of the extracted ion beam, the excitation current value of a magnet installed in the accelerator or the beam transport system so as to increase or decrease stepwise the excitation current value based on the energy level of the extracted ion beam and the number of times of stepwise changing of the energy level to reach the intended energy level of the extracted ion beam.