Abstract #4558
Effective in-plane distortion correction for 3DGRASE ASL acquisitions
Enrico De Vita 1,2 , Evelyne Balteau 3 , Xavier Golay 2 , and David L Thomas 2
1
Lysholm Department of Neuroradiology,
National Hospital for Neurology and Neurosurgery,
London, United Kingdom,
2
Academic
Neuroradiological Unit, Department of Brain Repair and
Rehabilitation, UCL Institute of Neurology, London,
United Kingdom,
3
Cyclotron
Research Centre, University of Lige, Liege, Belgium
3DGRASE is an extremely efficient acquisition strategy
for ASL. Blurring in slice/partition direction, related
to excessively long echo trains, is an issue in
single-shot acquisitions. This blurring can be decreased
with multi-shot acquisitions. In-plane geometric
distortions related to the GE-EPI readout caused by
magnetic susceptibility variations across the brain are
still a nuisance. We test the effectiveness of a
susceptibility distortion correction based on B0-field
maps, similarly to that routinely used for fMRI. An M0
acquisition repeated by inverting the in-plane
phase-encoding direction can be used to generate a
usable B0 map in alternative to the conventional
double-echo GE-2DFT acquisition.
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