Patent ID: 9604075
Date: 2017-03-28
CPC Classifications: A61N

Claim:
1. A method for calculating local part radiation doses in a radiotherapy system for the application of a total radiation dose in a target volume with beams, the method comprising: determining, by a treatment planning system, a location of at least one first control plane for controlling the dosing of the beams, wherein each of the at least one first control plane divides the target volume into two part volumes; allocating, by the treatment planning system, at least one of the beams for a front side and a rear side of each of the at least one first control plane, respectively; determining, by the treatment planning system, for each of the at least one first control plane, a sub-volume total radiation dose for each of the two part volumes as a fraction of the total radiation dose; determining, by the treatment planning system, a location of at least one second control plane for the control of the positioning of the beams, wherein each of the at least one second control plane divides the target volume into two sub-volumes; allocating, by the treatment planning system, at least one of the beams to each of the at least one second control plane, wherein the at least one beam allocated to the second control plane is divided in two by the respective second control plane such that a local part radiation dose of two beams obtained in this way in different sub-volumes, defined by the respective second control plane, is not equal to zero; calculating, by a processing device, for at least one side of the at least one first control plane, in isolation, the corresponding local part radiation doses of all the beams allocated to the at least one first control plane, such that the sum of the local part radiation doses of the beams that are allocated to the side of the respective first control plane that faces the respective sub-volume, provides the respective sub-volume total radiation dose, and the sum of the local part radiation doses of the beams allocated to the remainder of the at least one first control plane provides a difference between the respective sub-volume total radiation dose and the total radiation dose; and applying, by a radiation generating device, said beams based on the local part radiation doses calculated by the processing device.