Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 80, Issue 3, Pages 935-946Publisher
WILEY
DOI: 10.1002/mrm.27089
Keywords
respiration; shimming; spinal cord; spine; susceptibility
Funding
- Canada Research Chair in Quantitative Magnetic Resonance Imaging
- Canada Foundation for Innovation [32454]
- Canadian Institute of Health Research [CIHR FDN-143263]
- Fonds de Recherche du Quebec-Sante [28826]
- Fonds de Recherche du Quebec-Nature et Technologies [2015-PR-182754]
- Fonds de Recherche du Quebec-Nature et Technologies [B2 Doctoral Fellowship]
- Natural Sciences and Engineering Research Council of Canada [435897-2013]
- Quebec BioImaging Network
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PurposeTo reduce respiration-induced magnetic field distortions and the attendant image artifacts in echo-planar imaging (EPI) of the human spinal cord. MethodsUsing a custom-designed 24-channel shim array, shim updates were issued in real time based on a concurrently monitored respiratory trace and a pair of gradient echo (GRE) field maps acquired during an initial training phase. Proof-of-concept application in GRE-EPI was conducted in 6 subjects. ResultsOver the thoracic spinal cord, real-time shimming reduced respiration-induced distortions in the EPI by 48.2%12.2% and increased the mean temporal signal-to-noise ratio by 15.7%+/- 7.9%. ConclusionReal-time shim adjustment substantially reduces spatiotemporal B-0 field variation, opening the door to more robust imaging and spectroscopy investigations of the spinal cord. Magn Reson Med 80:935-946, 2018. (c) 2018 International Society for Magnetic Resonance in Medicine.
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