Patent ID: 8071966

Claim:
A control device for controlling an irradiation procedure in a particle therapy unit, the control device being configured to control at least two irradiation procedures of a target volume, the control device comprising: an energy variation controller configured to vary an energy of a particle beam in the at least two irradiation procedures in such a way that the target volume is irradiated layer-wise in layers that are spatially arranged one behind another, a sequence variation controller configured to vary a sequence, in which the layers of the target volume are irradiated in one of the at least two irradiation procedures, from a first of the at least two irradiation procedures to a second of the at least two irradiation procedures, in a direction of incidence of the particle beam, and an irradiation procedure controller configured to control the at least two irradiation procedures such that a sequence of layers that are irradiated in the first of the at least two irradiation procedures runs in an alternate direction from a sequence of layers that are irradiated in the second of the at least two irradiation procedures, with respect to the direction of incidence of the particle beam.