Patent ID: 8658991
Filing Date: 2014-02-25
Classification: A61N

Abstract:
1. A particle beam irradiation apparatus comprising: a particle beam acceleration means that accelerates a charged particle beam; a particle beam transport means that transports a charged particle beam launched from the particle beam acceleration means; a scanning apparatus that includes a first scanning means and a second scanning means, each of said first and second scanning means being configured to (i) generate a deflection magnetic field or a deflection electric field in a direction that is perpendicular to a traveling direction of the charged particle beam, and (ii) two-dimensionally scan the charged particle beam transported by the particle beam transport means; and an irradiation control means configured to: (i) control the first scanning means to scan the charged particle beam in two dimensions to irradiate a small region of a target region, such that the first scanning means performs scanning of the small region of the target region cyclically with a scanning pattern to administer a predetermined dose distribution of irradiation to the small region, and (ii) control the second scanning means to move the small region scanned by the first scanning means to different areas of the target region, wherein the small regions scanned by the first scanning means in the different areas have portions overlapped with one another.