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Abstract #2758

Evaluation of Conventional MR Surface Coil Impact on PET Quantification

Hua-Lei Zhang1, Sebastian Frst1, Axel Martinez-Mller1, Isabel Dregely1, Alexandra Bartel1, Markus Schwaiger1, Stephan Nekolla1

1Klinikum rechts der Isar der TU Mnchen, Munich, Bavaria, Germany

Multi-channel receiver coils are mandatory to obtain high-quality MR images. This study aims to evaluate regional effects from state-of-the-art MR coils not optimized for hybrid imaging on PET and to address whether rather demanding adjustments for usage in MR/PET are needed. Adding a 32-element coil set introduced PET activity underestimation but maintained the signal homogeneity in MR/PET, while severe inhomogeneity and preserved overall activity counts was found in CT-based attenuation corrected PET images. The findings provide insights on how to make compromises to obtain high-quality MR images without degrading PET activity concentration when using coils not specifically optimized for MR/PET.

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Keywords

acquisition acquisitions activity address adjusted adjustments affected aims alone anterior applications artifact artifacts attenuation axial axis biograph body cardiac central channel circular coil coils compartment compensated compromises concentration conductors copper corp corrected correction counts covering custom cylinder defined degrade degrading demanding designed despite developed deviation diameter differ distributed divided dose duration either element elements emission especially evaluate evaluation evenly filter findings greatly homogeneity hybrid illustrate impact incorporate index inhomogeneity inside insights integrated intensity interaction introduced invisible iterations length longer longitudinal loss mainly make mandatory meanwhile metal middle minimize model needed obstructed optimized overall overestimation peripheral periphery phantom phys pieces posterior presence propagated quality quantification radioactivity rather recently reconstructed reduced reduction regional representative respectively response scanned segmented serve severe significantly slice slices source space specifically stand subsets surface system systems template underestimation usage visible whether whole