Accurate quantitation in PET requires good stability of the detector gain. The challenging thermal environment of the detector in a PET/MR system (proximity to gradients, induced eddy currents, heat from RF shield, ...) makes accurate temperature compensation important. Current solutions rely on characterization of detector response together with real time temperature measurement for a predictive (open loop) gain control. This work presents a method of gain control that operates in real time by analyzing spectral information of singles events, permitting closed loop gain control in the presence of temperature gradients or count rate variations.
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