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Abstract #4373

A Comparison of Image-based and Field-monitoring-based Correction for Eddy Current and Bo Field Distortions in Diffusion Imaging Data

Yoojin Lee1, Klaas P Pruessmann2, and Zoltan Nagy1
1Laboratory for Social and Neural Systems Research (SNS Lab), University of Zurich, Zurich, Switzerland, 2Institute of Biomedical Engineering, ETH, Zurich, Switzerland

Diffusion MRI commonly proceeds with single-shot echo planar imaging (EPI) readout, which renders this modality sensitive to Eddy current and susceptibility-induced distortions. Both image-based and k-space-based correction methods have been suggested previously. The aim of this project was to use a standard dataset and compare output images of two image-based correction methods (topup/Eddy and Tortoise) and the extended signal model method. The latter relies on separate magnetic field monitoring data and a Bo field map. Qualitatively the output of three pipelines were similar. Future work will make the diffusion acquisition more challenging for a more complete systematic evaluation.

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