B 0 mapping using rewinding trajectories (BMART)

To create a B map and correct for off-resonance with minimal scan time increase for two-dimensional (2D) or 3D non-Cartesian acquisitions. Rewinding trajectories that bring the zeroth gradient moment to zero every repetition time (TR) were used to estimate the off-resonance with a center-out 3D cone...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2017-08, Vol.78 (2), p.664-669
Main Authors: Baron, Corey A, Nishimura, Dwight G
Format: Article
Language:English
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Summary:To create a B map and correct for off-resonance with minimal scan time increase for two-dimensional (2D) or 3D non-Cartesian acquisitions. Rewinding trajectories that bring the zeroth gradient moment to zero every repetition time (TR) were used to estimate the off-resonance with a center-out 3D cones trajectory, which required an increase in the minimum TR by 5%. The off-resonance estimation and correction was implemented using an algorithm based on binning and object-domain phase correction. B maps using BMART (B mapping using rewinding trajectories) were compared to maps obtained using separate scans with multiple echo time (TE) in a phantom and human brain. Excellent agreement between BMART and the multiple-TE method were observed, and images corrected with BMART were deblurred. BMART can correct for off-resonance without requiring an additional scan, and can be easily applied to center-out or projection trajectories (2D or 3D). Magn Reson Med 78:664-669, 2017. © 2016 International Society for Magnetic Resonance in Medicine.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.26391