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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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