Patent ID: 8890090

Claim:
A line scanning particle beam therapy apparatus comprising: a beam irradiation unit which has an X-axis scanning electromagnet that deflects a charged particle beam in the X-axis direction perpendicular to the direction straight ahead of the charged particle beam, and a Y-axis scanning electromagnet that deflects the charged particle beam in the Y-axis direction perpendicular to the direction straight ahead of the charged particle beam and the X-axis direction, and which radiates the charged particle beam as a line scanning beam; an irradiation position detection unit which is provided inside the beam irradiation unit and which detects an irradiation position within a plane formed by the X-axis and the Y-axis of the line scanning beam; a stationary time measuring unit which measures the stationary time of the line scanning beam at the irradiation position detected by the irradiation position detection unit; a scanning control unit which performs scanning control of the line scanning beam by utilizing the irradiation position detected by the irradiation position detection unit and the stationary time measured by the stationary time measuring unit; a memory which stores information regarding the irradiation position of the scanning beam, the stationary time of the line scanning beam, and a locus of the line scanning beam; a calculation processing unit which performs abnormality existence determination by comparing the irradiation position of the line scanning beam, the stationary time of the line scanning beam, and the locus of the line scanning beam, stored in the memory, with the irradiation position detected by the irradiation position detection unit, the stationary time of the line scanning beam measured by the stationary time measuring unit, and the locus of the line scanning beam obtained from a detection result of the irradiation position detection unit; and an interlock control unit which performs interlock control of stopping the irradiation of the line scanning beam, when the calculation processing unit determines an existence of an abnormality.