Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 65, Issue 4, Pages 1021-1035Publisher
WILEY-BLACKWELL
DOI: 10.1002/mrm.22685
Keywords
multicomponent relaxation; T-1; T-2; quantitative magnetic resonance imaging; human brain imaging; steady-state imaging
Funding
- Medical Research Council (MRC, UK) [G0800298]
- MRC [G0800298] Funding Source: UKRI
- Medical Research Council [G0800298] Funding Source: researchfish
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Multicomponent-driven equilibrium single-component observation of T-1 and T-2 offers a new approach to multiple component relaxation time and myelin water analysis. The method derives two-component relaxation information from spoiled and fully balanced steady-state (SPGR and bSSFP) imaging data acquired over multiple flip angles. Although these steady-state imaging techniques afford rapid acquisition times and high signal-to-noise ratio efficiency, they are also sensitive to main (B-0) and transmit (B-1) magnetic field inhomogeneities. These effects alter the measured signal from their theoretical values and lead to substantive errors in the derived myelin volume fraction estimates. Here, we incorporate correction techniques to mitigate these effects. DESPOT1-HIFI is used to first calibrate the transmitted flip angles; and B-0 affects are removed through the inclusion of an additional parameter in the multicomponent-driven equilibrium single-component observation of T-1 and T-2 fitting, coupled with the acquisition of multiple phase-cycled bSSFP data. The performance of these correction techniques was evaluated using numerical simulations, demonstrating effective removal of B-0 and B-1-induced errors in the derived myelin fraction relaxation parameters. The approach was also successfully demonstrated in vivo, with near artifact-free whole-brain, high spatial resolution (1.7 mm x 1.7 mm x 1.7 mm isotropic voxels) myelin water fraction maps acquired in a clinically feasible 16 min. Magn Reson Med 65:1021-1035, 2011. (C) 2010 Wiley-Liss, Inc.
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