Patent ID: 8405050
Filing Date: 2013-03-26
Classification: A61N

Abstract:
1. A method of determining an actual effective radiation dose distribution in the case of irradiation of a moving target volume which has a plurality of volume elements, having the following steps: detecting first positions of the plurality of volume elements in a first motional state of the moving target volume; detecting further positions of the plurality of volume elements in at least one further motional state of the moving target volume; determining transformation parameters by means of transformation of the first positions into the further positions; irradiating the moving target volume in accordance with an irradiation plan having a plurality of raster points to be irradiated, wherein during the irradiation of a raster point it is detected which of the motional states is occupied by the moving target volume; assigning raster points, during the irradiation of which the moving target volume occupied the first motional state, to a first sub-irradiation plan; assigning raster points, during the irradiation of which the moving target volume occupied the at least one further motional state, to at least one further sub-irradiation plan; and determining the actual effective dose for at least one of the plurality of volume elements, in each case from contributions from the raster points of the first sub-irradiation plan and of the at least one further sub-irradiation plan, using the transformation parameters, each of the contributions from the raster points of the first sub-irradiation plan and of the at least one further sub-irradiation plan including parameters for calculation of an absorbed radiation dose and a relative effectiveness.