Patent ID: 9108049
Filing Date: 2015-08-18
Classification: A61N

Abstract:
1. A control unit of a radiotherapy apparatus, comprising: a first imaging section configured to control an imager driving unit to move an imaging unit along a circumferential direction of a ring-shaped gantry such that said imaging unit is positioned into a first position arranged inside of said ring-shaped gantry; and a second imaging section configured to control said imager driving unit such that said imaging unit is positioned into a second position arranged inside of said ring-shaped gantry, wherein said imaging unit: receives, when said imaging unit is positioned into the first position, a first transmission radiation, which has passed a predetermined region, of a first radiation emitted from a first irradiating unit supported by said ring-shaped gantry, and images a first transmission image from the first transmission radiation, and receives, when said imaging unit is positioned into the second position, a second transmission radiation, which has passed the predetermined region, of a second radiation emitted from a second irradiating unit supported by said ring-shaped gantry, and images a second transmission image from the second transmission radiation, said control unit further comprising: a first reconstruction image imaging section configured to control said imager driving unit to move said imaging unit such that said imaging unit is positioned into a first reorganization position with respect to said ring-shaped gantry; a first reconstructing section configured to configure first three-dimensional data based on a plurality of said first transmission images imaged from the first radiation by said imaging unit when said imaging unit is positioned into the first reconstruction position; a second reconstruction image imaging section configured to control said imager driving unit to move said imaging unit such that said imaging unit is positioned into a second reconstruction position with respect to said ring-shaped gantry; and a second reconstructing section configured to reconstruct second three-dimensional data based on a plurality of said second transmission images imaged by said imaging unit when said imaging unit is positioned into the second reconstruction position, wherein said ring-shaped gantry rotates around a rotation axis of said ring-shaped gantry, wherein the plurality of said first transmission images are first reconstruction transmission images imaged when said ring-shaped gantry is positioned into a plurality of first gantry angles different from each other with respect to said ring-shaped gantry, wherein the plurality of said second transmission images are second reconstruction transmission images imaged when said ring-shaped gantry is positioned into a plurality of second gantry angles different from each other with respect to said ring-shaped gantry, and wherein a position in which said rotation axis is reflected on the plurality of first reconstruction transmission images is different from a position in which said rotation axis is reflected on the plurality of second reconstruction transmission images.