Radiation therapy device and method for generating a resolution enhancement in irradiated radiation exposure fields

摘要

The invention relates to a radiation therapy device comprising: a radiation source from which for radiation exposure purposes a beam can be directed onto a target volume from at least two opposite directions a collimator having a plurality of collimator elements for localising the treatment beam in order to generate a radiation exposure field wherein the expansion of the collimator elements predetermines a resolution of the radiation exposure field and an offset unit which causes the irradiation of opposing radiation exposure fields to be effected at an offset such that the two opposing radiation exposure fields are offset relative to each other by a fraction of the resolution. Furthermore the invention relates to a method for generating a resolution enhancement in irradiated radiation exposure fields in a radiation therapy device comprising the steps of: generating a first radiation exposure field with the aid of a collimator which delimits a beam emitted from a first spatial direction and which comprises a plurality of collimator elements that predetermine a resolution of the radiation exposure field; generating a second radiation exposure field by means of the collimator which delimits a further beam emitted from a second spatial direction wherein the second radiation exposure field is offset relative to the first radiation exposure field by a fraction of the resolution.