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Unwarping Echo Planar Images Using CMTK

Rohlfing, Torsten
SRI International
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Submitted by Torsten Rohlfing on 2012-10-01 18:22:11.

This document describes the workflow for unwarping echo planar MR images (EPI), in particular diffusion-weighted images, using an acquisition method with reversed phase encoding and the tools of the Computational Morphometry Toolkit (CMTK). This technique requires an additional acquisition (additional b=0 image for diffusion imaging) with reversed phase encoding direction, but no field map. Simple 6-direction diffusion data are provided with this article for demonstration.