Patent ID: 7324626

Claim:
A method for volumetric imaging on a radiotherapy apparatus, comprising: positioning a body, of which a volumetric image data set is to be produced, on a couch of the radiotherapy apparatus; rotating the couch or a bearing area of the couch or the body itself about a spatially fixed axis; during rotation, producing and storing multiple x-ray images of the body or of a part of the body by at least one radiation source/image recorder system which is separate from the radiotherapy apparatus and whose radiation path is substantially not parallel to and passes through the spatially fixed axis; detecting the rotational position of the couch or the bearing area of the couch or the body itself while the images are produced, and assigning the rotational position to the corresponding image; and reconstructing a volumetric image data set of the body from the x-ray images by image processing and assignment by a computer system.