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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