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B 0 mapping using rewinding trajectories (BMART)
Author(s) -
Baron Corey A.,
Nishimura Dwight G.
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26391
Subject(s) - imaging phantom , computer science , trajectory , cartesian coordinate system , magnetic resonance imaging , projection (relational algebra) , moment (physics) , algorithm , computer vision , physics , artificial intelligence , mathematics , optics , geometry , medicine , classical mechanics , astronomy , radiology
Purpose To create a B 0 map and correct for off‐resonance with minimal scan time increase for two‐dimensional (2D) or 3D non‐Cartesian acquisitions. Methods 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 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. Results Excellent agreement between BMART and the multiple‐TE method were observed, and images corrected with BMART were deblurred. Conclusion 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