Abstract #4270

Real time shimming over multiple regions across the DTI volume with motion correction using a multislab navigated DTI sequence

A Alhamud¹, Ernesta M. Meintjes¹, and André J.W. van der Kouwe²

¹Human Biology,MRC/UCT Medical Imaging Research Unit, University of Cape Town, Cape Town, South Africa, ²Massachusetts General Hospital, Charlestown, MA, United States

Most DTI acquisitions are based on 2D multislice EPI sequences. The spatial distribution of the field inhomogeneity may differ from region to region within the DTI volume. While the scanner and traditional prospective shimming methods shim over the whole volume, this may not be optimal for DTI. Further, changes in the shim in different regions across DTI volume in the presence of subject motion are yet to be explored. In this work, we introduce a technique to measure and correct the changes in the static field from region to region and for different sized regions across the DTI volume

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