Abstract #4442
Updating Shim Dynamically During Diffusion Tensor Imaging Acquisition
A. Alhamud 1 , Aaron T. Hess 2 , Paul A. Taylor 1,3 , Ernesta M. Meintjes 1 , and Andr J.W. van der Kouwe 4
1
Human Biology,MRC/UCT Medical Imaging
Research Unit, University of Cape Town, Cape Town,
Western Cape, South Africa,
2
University
of Oxford, Oxford, United Kingdom,
3
African
Institute for Mathematical Sciences, Western Cape, South
Africa,
4
Massachusetts
General Hospital, Charlestown, Massachusetts, United
States
Diffusion tensor imaging (DTI) is characterized by a
long acquisition time in which B0 homogeneity may change
from one TR to another, or from one DTI scan to another
due to many factors especially if head position changes
(e.g. acquiring DTI in two different phase encoding
directions AP and PA ). Several studies have focused
on evaluating the changes in B0 for fMRI, but this issue
has been largely neglected for DTI. In this work, we
present the first study to measure, report and correct
the inhomogeneity in the static field with simultaneous
real time shim correction,TR-by-TR, in real time.
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