Abstract: A device for supporting a patient for stereotactic on-target radiation therapy in the head region of the patient includes a supporting table with a tabletop movable at least in the horizontal plane, and a holding means for arranging a stereotaxis unit fixed on the head of the patient. The holding means is arranged on the tabletop and is associated with the head region of the patient projecting beyond the tabletop. This device provides aiming accuracy also with not highly rigid connections between a stereotaxis unit and the skull of a patient. This device provides a connection means permitting free relative movability at least in the longitudinal direction of the table or the patient, and at least temporarily between the tabletop and the stereotaxis unit.

Abstract: A method and device for correctly positioning a target within the target range of a radiation treatment apparatus by adjusting the target range to coincide with coordinates that have been assigned to the target. The adjustment is determined by selecting a reference point having a known spacial relation to the target range, and selecting a reference surface having a known spacial relation to the target. The spacing between the reference point and the reference surface is then measured and adjusted so that the target range and the target are in the same plane, having identical coordinates along one axis. The other coordinates of the target are then located on the reference surface, so that the target range can be exactly aligned with the target.