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• W2483990523 abstract "Purpose Recently, the multi‐echo gradient echo (MGRE) sequence has been proposed for multicomponent (MC ) based myelin water fraction (MWF) mapping. This approach has appeal because it can provide fast whole‐brain coverage, has low specific absorption rate, and short echo spacing. However, the MGRE signal requires correction for accurate MWF mapping, because of its sensitivity to magnetic field inhomogeneities (ΔB 0 ). We propose a ΔB 0 correction method for 2D MGRE data obtained for MWF mapping. Theory and Methods Latter‐echo MGRE data were fit to estimate B 0 gradients in the slice‐select direction ( ). The decay signal was corrected for the effects of , and MC analysis was performed using nonnegative least‐squares fitting. The method was evaluated using simulations and its performance demonstrated in healthy volunteers. Results Simulations showed that MWFs are significantly biased in the presence of and that our correction method leads to accurate MWF estimates. In vivo MWF maps obtained from corrected data showed recovery of MWF estimates in areas of high ΔB 0, and overall good agreement with literature values obtained with the reference MC ‐based method. Conclusion A new algorithm was presented for ΔB 0 correction of 2D MGRE echo data acquired for MWF imaging. Simulations and in vivo data showed an improvement in MWF estimates. Magn Reson Med 78:49–57, 2017. © 2016 International Society for Magnetic Resonance in Medicine" @default.
• W2483990523 created "2016-08-23" @default.
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• W2483990523 date "2016-07-15" @default.
• W2483990523 modified "2023-10-05" @default.
• W2483990523 title "Field inhomogeneity correction for gradient echo myelin water fraction imaging" @default.
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• W2483990523 doi "https://doi.org/10.1002/mrm.26334" @default.
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