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Abstract #1015

Self-navigation using fat navigators for motion immune diffusion weighted-imaging via chemical-shift encoded multi-shot EPI

Yiming Dong1, Kirsten Koolstra2, Malte Riedel3, Matthias J.P. van Osch1, and Peter Börnert1,4
1C.J. Gorter MRI Center, Department of Radiology, LUMC, Leiden, Netherlands, 2Philips, Best, Netherlands, 3University and ETH Zurich, Zurich, Switzerland, 4Philips Research, Hamburg, Germany

Synopsis

Keywords: Motion Correction, Motion CorrectionThe presence of fat is a challenge in diffusion-weighted EPI. Recently, chemical-shift encoded approaches found interest, as a smart way of signal averaging, doing water/fat separation and diffusion phase navigation in the reconstruction. However, the dominant signal character of fat in diffusion could actually also be exploited as an advantage by forming a shot-specific fat navigator to track and correct for macroscopic in-plane motion, combined with a model-based self-navigated water/fat decomposition. This allows to correct for both physiological and macroscopic in-plane motion effects in DWI when estimating water and fat resolved images from chemical-shift encoded multi-shot EPI data.

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