Thermal management of photon-counting detectors

An X-ray detector system comprising:

• a photon-counting detector comprising multiple detector modules, each detector module comprises power-consuming circuitry and at least a subset of said multiple detector modules comprises a temperature sensor configured to monitor a temperature on said detector module and generate a temperature representative signal;
• and
• a detector controller connected to said photon-counting detector and configured to selectively switch, for at least a subset of said multiple detector modules, said detector modules between an idle mode in which at least a respective part of said detector modules is powered off and an operational mode in which said detector modules are powered on, wherein power-consuming circuitries of said at least a subset of said detector modules are configured to generate calibration data based on a respective temperature representative signal to correct for any temperature-induced changes to image data generated by said photon-counting detector.