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
