Patent ID: 7209580

Claim:
A computed tomography method for forming images of an object to be examined which is arranged in an examination zone, which method includes the steps of: generating, while using an X-ray source, a conical X-ray beam which traverses the examination zone of the object to be examined which is arranged therein; rotating the X-ray source and an oppositely arranged X-ray detector on the other side of the examination zone along a trajectory around the examination zone; acquiring projection data from the X-ray detector during the rotation; reconstructing one or more images from the projection data; using the one or more images to select an imaging zone of the object to be examined, wherein the selected imaging zone of the object has a spatial orientation different from a spatial orientation of the one or more reconstructed images; determining sub-regions of the X-ray detector on which the imaging zone of the object to be examined is projected during the acquisition of the projection data; forming sub-projection data by selecting the projection data associated with the sub-regions from the acquired projection data; and reconstructing one or more images of the selected imaging zone from the sub-projection data.