Patent ID: 7466792

Claim:
A system for producing CT image data records and for irradiating a patient, comprising: exactly one rotary frame for holding at least one radiation source, and at least one radiation detector situated opposite to move about a system axis; at least one x-ray tube as the at least one radiation source, including a diaphragm that is dynamically adjustable during rotation of the rotary frame; at least one detector including a multiplicity of detector elements, arranged in planar fashion, to measure radiation emanating from the x-ray tube; and an arithmetic logic and control unit, wherein in a first operating mode for imaging, during the revolution of the rotary frame the at least one x-ray tube radiates a ray fan of constant fan angle onto the oppositely situated detector, and CT image data records are calculated from the measured radiation of the detector, and in a second operating mode for irradiation, at least one x-ray tube, used for imaging radiates an x-ray fan that varies with reference to alignment during the rotation of the rotary frame, is relatively narrower perpendicular to the system axis than the ray fan of the first operating mode, and remains aligned with the site of at least one tumor in a patient independently of the angular position of the rotary frame, wherein during the irradiation, the patient has a means for sensitizing the at least one tumor to radiation, and a relatively smaller focal spot is present at the x-ray tube in the first operating mode, as compared to the second operating mode.