Abstract: The invention relates to a method for selection of a new detector module as replacement for a detector module built in to a detector of an X-ray computer tomograph, comprising the following steps: a) production of the detector module, using component (5) with a unique electronically-stored code, b) generation of a data set containing the essential parameters of each detector module with reference to the code of each detector module, c) storage of the data set and the code in an electronic databank, d) electronic reading of the code of the detector module for exchange and comparison of the relevant stored data set with the data sets for new detector modules and e) selection of a new detector module according to set selection criteria.