Abstract: A fan beam computer tomography apparatus of the third generation has a measurement unit, including an x-ray source and a detector array, which rotates around a system axis, extending through an examination volume. The computer tomography apparatus is operated by dividing the detector elements of the detector array into groups for the data acquisition, and data acquisition of the output signals of the detector elements is controlled by undertaking the signal integration and the signal read-out simultaneously within a group, but chronologically offset in successive groups, with the chronological offset corresponding exactly to the time required for the measurement unit to rotate between successive projection directions.