To provide a method for correcting detector signals wherein a simple detector can be used, without causing a loss in image quality when picking up an image.

In the method for correcting detector signals of a unit for reconstructing tomograms from projection data, in particular of a computer tomography unit, of an X-ray detector having a a plurality of individual detector channels that form the projection data, attenuation values of individual X-rays are calculated after the passage through an examination object. In order to reconstruct the tomograms from attenuation values of the X-rays, the detector output signals are subjected to a nonlinearity correction before the calculation of the attenuation values.