Implementation of anatomical navigators for real time motion correction in diffusion tensor imaging
Doctoral Thesis
2012
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University of Cape Town
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Abstract
Prospective motion correction methods using an optical system, diffusion-weighted prospective acquisition correction, or a free induction decay navigator have recently been applied to correct for motion in diffusion tensor imaging. These methods have some limitations and drawbacks. This article describes a novel technique using a three-dimensional-echo planar imaging navigator, of which the contrast is independent of the b-value, to perform prospective motion correction in diffusion weighted images, without having to reacquire volumes during which motion occurred, unless motion exceeded some preset thresholds. Water phantom and human brain data were acquired using the standard and navigated diffusion sequences, and the mean and whole brain histogram of the fractional anisotropy and mean diffusivity were analyzed.
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Includes bibliographical references.
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Alhamud, A. 2012. Implementation of anatomical navigators for real time motion correction in diffusion tensor imaging. University of Cape Town.