A CT system includes a rotatable gantry having an opening for receiving an object to be scanned, an x-ray source configured to project x-rays through the opening, and a detector assembly positioned to receive the x-rays. The detector assembly includes a plurality of readout chips positioned within a cooling zone and configured to receive electrical signals from a plurality of diode arrays, and a fan positioned to blow air into the cooling zone. An air temperature within the cooling zone is controlled independent of a speed of the fan.
