FMRI using a 3D radial-Cartesian trajectory: spatio-temporal tunability and artifact correction
Nadine N Graedel 1 , Mark Chiew 1 , Jennifer A McNab 2 , and Karla L Miller 1
FMRIB Centre, University of Oxford, Oxford,
Oxfordshire, United Kingdom,
of Radiology, Stanford University, California, United
We propose the use of a 3D hybrid radial-Cartesian
trajectory for functional MRI, in which the readout EPI
planes are rotated around kz according to an angle
scheme based on the golden ratio. This acquisition
strategy facilitates correction for many sources of
temporal fluctuation (such as motion and physiological
noise) and allows flexible post-acquisition definition
of spatio-temporal resolution. We implemented example
corrections for motion and physiological noise, which
allowed recovery of data corrupted by severe motion.
Additionally we show visual fMRI data reconstructed at
different temporal resolutions.
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