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Abstract #3380

Intra-rectal gel suppression effectiveness on rectal cancer MR diffusion-weighted images

Edward M Lawrence1,2 and David H Kim1
1Radiology, UW-Madison School of Medicine and Public Health, Madison, WI, United States, 2Radiology, WS Middleton VA Hospital, Madison, WI, United States


Retrospective evaluation of intra-rectal gel suppression on DWI from 60 rectal MRIs. The DWI, including b1000, computed synthetic b1500, and ADC maps were evaluated by 2 radiologists independently using a 5 point Likert scale with scores of 4-5 considered fully diagnostic. The median suppression score was significantly greater than 3 for both readers (p<0.05) with fully diagnostic suppression achieved in 57/60 (95.0%) and 53/60 (88.3%) cases for reader 1 and 2, respectively. No study was given a score of 1 or 2 by either reader. These results suggest that gel does not impede reader evaluation for tumor restriction at DWI.

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