Patent ID: 6865253

Claim:
A method for accurately positioning a patient for radiotherapy and/or radiosurgery, comprising the following steps: a) the patient is pre-positioned with respect to a linear accelerator; b) after the patient has been pre-positioned, at least two x-ray images of the patient and/or one of the parts of his body in the vicinity of a radiation target point are produced from different respective recording angles on a single image recorder; c) the x-ray image is spatially localized; d) at least one reconstructed image, corresponding to each x-ray image and deriving from a three-dimensional patient scan data set, is produced, the reconstructed images giving the desired image content of the respective x-ray image when the patient is correctly positioned; e) the reconstructed images and the x-ray images are superimposed, and a positioning error is determined electronically and/or with computer guidance; and f) the position of the patient is corrected by way of the determined positioning error; and wherein the x-ray images are produced in defined positions offset with respect to the location at which the patient is pre-positioned and, outside of the irradiating range of the linear accelerator, the reconstructed images being produced with the same offset.