3D EPI Phase Maps for Real Time EPI Distortion Correction
A. Alhamud 1 , Paul A. Taylor 1 , Andr J.W. van der Kouwe 2 , and Ernesta M. Meintjes 1
Human Biology,MRC/UCT Medical Imaging
Research Unit, University of Cape Town, Cape Town,
Western Cape, South Africa,
General Hospital, Charlestown, Massachusetts, United
Single- or multi-shot Echo Planar Imaging (EPI) is the
first choice for several imaging modalities such as
diffusion tensor imaging (DTI) and functional MRI (fMR)
etc, due to its ability to acquire images very rapidly.
EPI is affected by several artifacts such as distortion
from magnetic field inhomogeneity. Although several
techniques have been reported for correcting the B0
homogeneity, these methods have some limitations and
drawbacks. In this work we introduce a sophisticated
method using the 3D EPI phase maps to correct TR-by-TR
in real time the distortion in B0 for any imaging
modality that implement EPI.
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