Computed tomography apparatus

A computed tomography apparatus which includes

• a scanning unit with a radiation source and a detector unit which is connected thereto in order to detect a conical radiation beam, emitted by the radiation source, after its passage through the examination zone of a patient who is situated between the radiation source and the detector unit,
• a drive unit for producing a relative motion, formed as helix around an axis of rotation, between the scanning unit and the patient, and
• a reconstruction unit for reconstructing a 3D image data set of the examination zone from the measuring data acquired by the detector unit within a detector window defined by the helix, the connecting lines from the radiation source to the two edges of the detector window, being offset relative to one another in the direction of the axis of rotation, intersecting two segments of the helix which are offset by the distance (2n+1)p in the direction of the axis of rotation, where n is a small integer number larger than or equal to 1 and p corresponds to the axial offset between two neighboring turns of the helix, so that the Radon domain is regionally filled with a different degree of redundancy by the measuring data,
• characterized in that there is provided a cardiac motion signal detection device for the detection of a cardiac motion signal representing the cardiac motion, and in that the reconstruction unit is arranged to select, on the basis of the cardiac motion signal, such measuring data from among the measuring data regionally redundantly filling the Radon domain the Radon domain is completely and homogeneously filled with measuring data from cardiac motion phases with as little motion as possible.