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B0 mapping using rewinding trajectories (BMART)
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DOI：10.1002/mrm.26391.png)
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Abstract
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PurposeTo create a B-0 map and correct for off-resonance with minimal scan time increase for two-dimensional (2D) or 3D non-Cartesian acquisitions. MethodsRewinding 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-0 maps using BMART (B-0 mapping using rewinding trajectories) were compared to maps obtained using separate scans with multiple echo time (TE) in a phantom and human brain. ResultsExcellent agreement between BMART and the multiple-TE method were observed, and images corrected with BMART were deblurred. ConclusionBMART 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. (c) 2016 International Society for Magnetic Resonance in Medicine
Keywords:
off-resonance correction
B-0 map
deblurring
non-Cartesian
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