Ascertaining an electrical direct current component in the converter element

A detector module having a plurality of counting X-ray detectors arranged in a stacked arrangement, for converting X-ray radiation into signal pulses, the detector module comprising:

• a controller;
• and each of the plurality of counting x-ray detectors having an illumination layer;
• a converter element, the illumination layer being designed to illuminate the converter element;
• an evaluation unit;
• a measuring device to ascertain electrical direct current components as signal pulses in the converter element when illuminated, the evaluation unit including a counting device to ascertain from the signal pulses, a number or an energy of events, wherein
• the controller receives the signal pulses from the measuring device and is configured to control illumination emitted from the illumination layer such that a direct current component induced in the plurality of converter elements is the same.