Patent ID: 9199094
Filing Date: 2015-12-01
Classification: A61N,H05H

Abstract:
1. An operating method of a charged particle beam irradiation system comprising a synchrotron for irradiating an affected part of a patient and comprising, in one operating cycle of the synchrotron, steps of injection-capturing, accelerating, extraction controlling, and decelerating, the operating method comprising: providing a high speed steering system between the synchrotron and an irradiation field forming device; using the high speed steering system for extracting a part of a charged particle beam accumulated in the synchrotron as a checking beam before an extraction start in the extraction controlling step; diverging the checking beam extracted from the synchrotron into a beam dump in the high speed steering system by controlling excitation of a steering electromagnet disposed in the high speed steering system downstream of the synchrotron; providing a multi-layer beam monitor in the high speed steering system and before, in a direction of travel of the checking beam, the beam dump; measuring a dose distribution of the checking beam to be absorbed into the beam dump by passing the checking beam through the multi-layer beam monitor disposed in the high speed steering system; checking an irradiation depth of the charged particle beam with which the affected part of the patient is to be irradiated, before irradiating the patient, using the dose distribution of the checking beam passing through the multi-layer beam monitor; and saving and managing the dose distribution of the checking beam.