Abstract: A method provides real-time correction of the spatial position of the central beam of radiation therapy devices and therapy simulators, along with the patient position. In particular, the method relates to the real-time correction of irradiation positions of the collimator and/or the position of the patient positioning table during the performance of radiation therapy or therapy simulation. Positional deviations of the central beam of existing radiation therapy devices are reduced. Position adjustments of the collimator elements and/or of the patient support table are carried out through functional connections of separate control modules via separate adjustment devices. Those are added to the collimator and/or patient support table. Calculation of the correction movements takes place outside the radiation therapy device in the irradiation planning system and/or in at least one microcontroller of the control system of the radiation therapy device.

Abstract: A method for EPID-based verification, correction and minimization of the isocenter of a radiotherapy device includes the following: Positioning a measurement body; applying an irradiation field; capturing a common dose image of the measurement body; creating a dose profile on the basis of the captured dose image; determining an inflection point in a plot of the dose profile; linking positions of the inflection points to bodily limits of the measurement body; determining position of a center point of the measurement body relative to an EPID-center; determining a differential vector from a deviation in position of the center point of the measurement body from the EPID-center and from a deviation in position of the field center point of the irradiation field from the EPID-center; and correcting the current radiological isocenter.

Abstract: A method provides real-time correction of the spatial position of the central beam of radiation therapy devices and therapy simulators, along with the patient position. In particular, the method relates to the real-time correction of irradiation positions of the collimator and/or the position of the patient positioning table during the performance of radiation therapy or therapy simulation. Positional deviations of the central beam of existing radiation therapy devices are reduced. Position adjustments of the collimator elements and/or of the patient support table are carried out through functional connections of separate control modules via separate adjustment devices. Those are added to the collimator and/or patient support table. Calculation of the correction movements takes place outside the radiation therapy device in the irradiation planning system and/or in at least one microcontroller of the control system of the radiation therapy device.

Abstract: A method for EPID-based verification, correction and minimization of the isocenter of a radiotherapy device includes the following: Positioning a measurement body; applying an irradiation field; capturing a common dose image of the measurement body; creating a dose profile on the basis of the captured dose image; determining an inflection point in a plot of the dose profile; linking positions of the inflection points to bodily limits of the measurement body; determining position of a center point of the measurement body relative to an EPID-center; determining a differential vector from a deviation in position of the center point of the measurement body from the EPID-center and from a deviation in position of the field center point of the irradiation field from the EPID-center; and correcting the current radiological isocenter.