In a simultaneous ToF-enabled SiPM PET/MR scanner, eddy currents induced by the changing gradient field lead to increased temperature around the PET detectors; this can change the detector gain and shift the position of the photopeak in the spectrum, reducing accuracy of the reconstructed image. Conventionally, peak stability is achieved by thermal monitoring system and adjusting the gain based on the temperature. A more accurate gain control algorithm is presented, which analyzes the spectrum of single events detected on each device. Reconstructed activity of a PET phantom in extreme MR gradient switching is measured to remain stable, better than 0.5%.
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