Abstract #3078
Whole-Body PET-MR Including DWI, T2w, and Gadofosveset-enhanced T1w Sequences: Evaluation of MR Performance Compared to PET-CT and Relative Benefits Provided by Each Sequence
Piotr Obara 1 , Andreas Loening 1 , Valentina Taviani 1 , Andrei Iagaru 1 , Brian Hargreaves 1 , and Shreyas Vasanawala 1
1
Radiology, Stanford Hospital, Stanford,
California, United States
Diffusion-weighted (DW), T2-weighted, and
gadofosveset-enhanced T1-weighted images from 14 whole
body PET-MR exams were assessed by 2 radiologists for
presence of malignant disease as well as lesion
conspicuity and delineation. Compared to PET-CT, MR
showed good sensitivity and specificity on a per-organ
basis but only fair specificity on a per-patient basis
due to false positive findings in osseous structures.
Lesion conspicuity was rated best on DW images,
particularly in osseous structures. The relatively lower
conspicuity on post-contrast images could have been in
part due to suboptimal lesion enhancement with
gadofosveset.
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