Patent ID: 8829466

Claim:
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: a mathematical model that creates a command value for the excitation current and has a parameter wherein the parameter relates an input and an output of the mathematical model, a command evaluator that evaluates the result of a run-through with a command value for the excitation current, and a parameter updater that updates the parameter of the mathematical model when the result of the evaluation by the command evaluator does not satisfy the predetermined condition.