Dedicated RF coils are required to acquire high
resolution MR images. These RF coils are in the PET field of view in a PET/MRI
scanner. Therefore, attenuation from these coils can cause bias in PET
quantification. This study compares a newly developed dedicated PET/MRI RF coil
with a coil designed for MRI-only. Both a phantom and patients injected with 18F-FDG were scanned with both coils and without a dedicated
coil (baseline). Activity measured in the phantom was significantly reduced
with the MRI-only coil compared to the new coil, which did not show any significant attenuation effect. Results in patients support this finding.