Prospective motion correction of 3D EPI data for functional MRI using optical tracking.
Nick Todd 1 , Oliver Josephs 1 , Martina Callaghan 1 , and Nikolaus Weiskopf 1
Wellcome Trust Centre for Neuroimaging,
London, United Kingdom
An approach to using the XPACE camera system for
prospective motion correction of MRI data was
implemented for a 3D echo-planar imaging pulse sequence.
The method uses a high frame rate camera to track the
six degrees-of-freedom movement of a marker that is
attached to the patient. This information is fed to the
scanner host computer to dynamically update the imaging
gradients necessary for rigid body realignment of the
data to be acquired. The PMC method was tested for the
application of acquiring 3D EPI data for functional MRI
studies where high SNR and temporal stability are of
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