Patent ID: 9220919
Filing Date: 2015-12-29
Classification: A61N

Abstract:
1. A radiotherapy apparatus controller comprising: a planning-stage position data collecting section configured to collect planning-stage position data which indicates a planning-stage position where a subject is arranged during a planning stage; a position-adjusting-stage position data collecting section configured to measure position-adjusting-stage 3-dimensional data which indicates a position-adjusting-stage position where the subject is arranged during a position-adjusting stage different from the planning stage; a correction amount calculating section configured to calculate a treatment-stage position, a gantry-angle offset value and a ring-angle offset value based on the planning-stage position data and the position-adjusting-stage 3-dimensional data; a treatment plan collecting section configured to collect an irradiation direction in which an irradiation head is arranged with respect to the planning-stage position, the irradiation head being supported by a gantry, the gantry being supported rotatably with respect to a ring, and the ring being supported rotatably with respect to a ring base; an irradiation head driving section configured to control an irradiation head driving device, which moves the ring and the gantry, based on the irradiation direction such that the ring is arranged at a corrected ring angle with respect to the ring base and the gantry is arranged at a corrected gantry angle with respect to the ring; a couch configured to rotatably move around a rotational axis parallel to a direction that is fixed with respect to the ring base and move in a parallel direction with respect to the ring base; and a couch driving section that controls a couch driving device which is configured to move the subject from the position-adjusting-stage position to the treatment-stage position, wherein the irradiation direction indicates a gantry angle and a ring angle, wherein the corrected ring angle indicates the difference that the ring-angle offset value is subtracted from the ring angle, wherein the corrected gantry angle indicates the difference that the gantry-angle offset value is subtracted from the gantry angle, wherein the gantry-angle offset value and the ring-angle offset value are calculated such that the irradiation head is arranged in the irradiation direction with respect to the treatment-stage position when the ring is arranged at the corrected ring angle with respect to the ring base and the gantry is arranged at the corrected gantry angle with respect to the ring, wherein a movement of the subject from the position-adjusting-stage position to the treatment-stage position is comprised of the rotational movement around the rotational axis and the parallel movement with respect to the ring base.