Patent ID: 8212223

Claim:
A particle beam irradiation apparatus comprising: an accelerator; a scanning electromagnet; and a scanning controller for controlling the scanning electromagnet to irradiate a charged particle beam from the accelerator to an irradiation subject, the scanning electromagnet having: an X-direction scanning electromagnet; and a Y-direction scanning electromagnet for scanning in a direction perpendicular to a scanning direction of the X-direction scanning electromagnet, the scanning controller having: an X-direction inverse mapping mathematical expression model for generating an X-direction command value for exciting the X-direction scanning electromagnet; and a Y-direction inverse mapping mathematical expression model for generating a Y-direction command value for exciting the Y-direction scanning electromagnet, from a desired irradiation position coordinate of the charged particle beam in the irradiation subject so that irradiation to the irradiation subject is implemented on the basis of the command values concerned, each of the X-direction and Y-direction inverse mapping mathematical expression models containing all of two variables when the desired irradiation position coordinate on an irradiation position plane of the charged particle beam is represented by the two variables concerned, wherein the X-direction and Y-direction scanning electromagnets are controlled on the basis of the X-direction and Y-direction command values generated from the desired irradiation position coordinate of the charged particle beam in the irradiation subject by the X-direction and Y-direction inverse mapping mathematical expression models, thereby irradiating the irradiation subject with the charged particle beam while scanning the charged particle beam.