Patent ID: 7313214

Claim:
A computed tomography unit, comprising: at least one X-ray tube, adapted to scan an object in a fashion rotating in a circle or spiral about a z-axis; a detector, oppositely situated to the at least one X-ray tube and including a multiplicity of detector rows, each detector row having an aperture Δz in the z-direction and having a multiplicity of detector elements; and a detector diaphragm, arranged between the at least one X-ray tube and the detector, adapted to reduce the aperture Δz of the detector rows in the z-direction, the X-ray tube including a focus of variable location relative to the X-ray tube and which alternatingly assumes during sampling at least two different positions that have different z-coordinates relative to the X-ray tube, a scanning rate in the z-direction being multiplied in accordance with the number of the different z-coordinates of the focus in relation to the X-ray tube; wherein the detector diaphragm is designed such that it cuts the active surface of the individual detector elements in the circumferential direction, and the detector diaphragm is designed such that the active surface of the individual detector elements is of square design.