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Abstract #0780

Compensation for thermally-induced loads on PET detectors from MR stimulus in simultaneous PET/MR imaging

Chang Kim 1 , William T Peterson 1 , Tesfaye Kidane 1 , Sri Harsha Maramraju 1 , and Craig S Levin 2

1 GE Healthcare, Waukesha, WI, United States, 2 Department of Radiology, Stanford University School of Medicine, Stanford, CA, United States

We evaluated the impact of gradient-induced thermal loads on the PET detector ring in a hybrid time-of-flight PET/MR system developed for simultaneous whole body PET/MR imaging. Varying temperature profiles generated due to the high intensity gradient fields compromise the performance of PET detectors that are in close proximity of the RF shield. Gradient echo EPI sequences were used to study the drifts in the 511 keV energy peak of the PET detectors. A thermal regulation algorithm was developed and applied to correct the energy peak drift. Results show that the method developed compensates well for MR induced thermal drift.

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