Particle therapy system

摘要

A particle therapy system is capable of reducing an increase in treatment time caused by the initialization operation of magnets in the execution of the scanning irradiation method successively changing the energy level of a beam extracted from an accelerator. An irradiation control apparatus has a scheme that calculates setting vales of excitation current for bending magnets for a transport system on every irradiation condition (energy condition), and sets appropriate excitation current values according to the irradiation sequence. The irradiation control apparatus 35 prestores in a current supply control table 1 reference current values determined corresponding to energy levels of the ion beam, prestores in current supply compenzation value tables 1, 2 compenzation current values determined corresponding to energy levels of the ion beam and numbers of times of changing the energy level, and calculates the excitation current value of the magnets by using the values prestored in the tables.

主权项

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.