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Abstract #2037

Distortion Correction in Abdominal DW-MRI using Dual-Echo EPI for Improved Evaluation of Crohn’s Disease

Cemre Ariyurek1, Onur Afacan1, and Sila Kurugol1
1Radiology, Boston Children's Hospital and Harvard Medical School, Boston, MA, United States


In MR enterography, diffusion-weighted MRI (DW-MRI) is commonly used to evaluate Crohn’s disease (CD). Echo-planar imaging (EPI) used in DW-MRI suffers from geometric distortion due to time-varying susceptibility field changes in the bowel. Hence, we implemented a DW-MRI sequence using a dual-echo EPI with opposing encoding polarities. Thus, the distortion field can be estimated dynamically and corrected retrospectively. The proposed method was evaluated in DW-MRI data acquired on suspected CD patients by visually and quantitatively assessing distortion corrected volumes based on anatomical similarity with T2-HASTE and uncertainty of estimated diffusion parameters of the intravoxel incoherent motion model.

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