Patent ID: 9155909
Filing Date: 2015-10-13
Classification: A61B,A61N,G06T

Abstract:
1. A radiation therapy apparatus for treating an organism with irradiating therapeutic radiation on the organism, and for use with a positron-emitting radionuclide, the radiation therapy apparatus comprising: a pair of two-dimensional radiation detectors which are arranged so as to be opposed to each other with the therapeutic radiation which is emitted passing therebetween, and detect respectively an incident two-dimensional positions of a pair of annihilation γ rays produced when positrons emitted from the positron-emitting radionuclide annihilate; a radionuclide position detecting unit structured to detect a position of the positron-emitting radionuclide on a line connecting a pair of positions detected by the pair of two-dimensional radiation detectors; and a radiation irradiation device structured to irradiate the therapeutic radiation toward the position of the positron-emitting radionuclide on a plane of interest; wherein radionuclide position detecting unit is structured to assume that the positron-emitting radionuclide exists at a point where the line intersects the plane of interest, which is determined in accordance with the irradiation position of the therapeutic radiation, to determine a provisional position of the positron-emitting radionuclide; wherein the radionuclide position detecting unit is structured to determine that the positron-emitting nuclide exists on the plane of interest when a position distribution formed by the determined provisional position of the positron-emitting radionuclide in time series is within a predetermined range on the plane of interest.