In a method for fault identification in a computed tomography system (1), which comprises an X-ray tube (2) with a rotating anode (10) as well as an at least single-array detector (3), a test measurement is performed by means of the computed tomo-graphy system (1), in the course of which the exposure inten-sity (B) in at least one detector array (13a,13b) is recorded on a time-resolved basis. According to the method at least one spectrally selective fluctuation (FF) in the recorded exposure intensity (B) at the rotating anode frequency (fA) and/or a whole multiple of this frequency (fA) is determined. A measure for the strength of the plate impact of the X-ray tube (2) is derived from the frequency-selective fluctuation (FF).
