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Abstract #3343

Field-map correction in read-out segmented echo planar imaging for reduced spatial distortion in prostate DWI – a phantom study

Robert Bergen1,2 and Lawrence Ryner1,2

1Physics & Astronomy, University of Manitoba, Winnipeg, MB, Canada, 2Medical Physics, CancerCare Manitoba, Winnipeg, MB, Canada

Diffusion-weighted magnetic resonance imaging (DWI) is routinely used in prostate cancer assessment, but suffers from image distortions primarily due to the tissue-air interface at the rectal cavity. Readout-segmented echo planar imaging (RESOLVE) improves image quality through segmented acquisition of k-space, increasing bandwidth in the phase direction. However, distortions of several millimeters may still exist in RESOLVE images. This study quantified distortions in a prostate phantom by varying the number of RESOLVE segments and using field mapping correction techniques. Field mapping correction decreased image distortion by 28% compared to the 7-segment RESOLVE scan.

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