Abstract: A method for irradiation planning for a quasi-cyclically moving target volume includes defining a first movement phase within a movement period of the target volume and carrying out a first irradiation planning using a first position of the target volume during the first movement phase. The method also includes defining a second movement phase within the movement period of the target volume, and carrying out a second irradiation planning for the second movement phase using a second position of the target volume during the second movement phase. An apportionment of a total dose to be applied is provided to a first partial dose that is allocated to the first movement phase and to a second partial dose that is allocated to the second movement phase.

Abstract: A method for irradiation planning for a quasi-cyclically moving target volume includes defining a first movement phase within a movement period of the target volume and carrying out a first irradiation planning using a first position of the target volume during the first movement phase. The method also includes defining a second movement phase within the movement period of the target volume, and carrying out a second irradiation planning for the second movement phase using a second position of the target volume during the second movement phase. An apportionment of a total dose to be applied is provided to a first partial dose that is allocated to the first movement phase and to a second partial dose that is allocated to the second movement phase.

Abstract: A radiotherapy device includes a therapeutic radiation source for providing a beam for irradiating a moving target volume and a beam correcting apparatus for directing the beam onto the target volume. The beam correcting apparatus includes a collimator having a collimator aperture for delimiting the beam, a positioning apparatus for positioning the target volume relative to the beam, and a controller for selecting a position of the collimator aperture relative to the beam and for selecting a position of the positioning apparatus such that when the beam is correctively adjusted, the movement of the target volume in a first movement direction is compensated for by displacing the collimator aperture, and the movement of the target volume in a second movement direction is compensated for by repositioning the target volume with the positioning apparatus.