Patent ID: 8829466
Filing Date: 2014-09-09
Classification: A61N,G06N,G21H,G21K,H01J

Abstract:
1. A particle beam irradiation apparatus comprising: a scanning electromagnet that scans a charged particle beam accelerated by an accelerator and has a hysteresis; a scanning power source that outputs an excitation current for driving the scanning electromagnet; and an irradiation control apparatus that controls the scanning power source, wherein the irradiation control apparatus has a scanning electromagnet command value learning generator that (i) evaluates the result of a run-through, which is a series of irradiation operations through a command value for the excitation current outputted from the scanning power source without a patient present, wherein the command value for the excitation current is the entire excitation current value that is used in the driving of the scanning electromagnet, (ii) updates the command value for the excitation current when the result of the evaluation does not satisfy a predetermined condition in order to perform another run-through, (iii) outputs to the scanning power source the command value for the excitation current when its evaluation result has satisfied the predetermined condition, and (iv) stores, in a storage apparatus, an updated command value that results in a run-through result satisfying the predetermined condition, for actual irradiation of a patient, wherein the updated command value completely replaces a previous command value, and wherein the scanning electromagnet command value learning generator comprises: