Myelin biomarkers in the healthy adult brain: Correlation, reproducibility, and the effect of fiber orientation.

Autor: Morris SR; Radiology, University of British Columbia, Vancouver, British Columbia, Canada.; Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, British Columbia, Canada., Vavasour IM; Radiology, University of British Columbia, Vancouver, British Columbia, Canada.; International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, British Columbia, Canada.; UBC MRI Research Center, University of British Columbia, Vancouver, British Columbia, Canada., Smolina A; Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.; The Hospital for Sick Children, Toronto, Ontario, Canada., MacMillan EL; Radiology, University of British Columbia, Vancouver, British Columbia, Canada.; UBC MRI Research Center, University of British Columbia, Vancouver, British Columbia, Canada.; MR Clinical Science, Philips Healthcare Canada, Mississauga, Ontario, Canada., Gilbert G; MR Clinical Science, Philips Healthcare Canada, Mississauga, Ontario, Canada., Lam M; Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; UBC MRI Research Center, University of British Columbia, Vancouver, British Columbia, Canada., Kozlowski P; Radiology, University of British Columbia, Vancouver, British Columbia, Canada.; Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, British Columbia, Canada.; UBC MRI Research Center, University of British Columbia, Vancouver, British Columbia, Canada., Michal CA; Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada., Manning A; Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada., MacKay AL; Radiology, University of British Columbia, Vancouver, British Columbia, Canada.; Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; UBC MRI Research Center, University of British Columbia, Vancouver, British Columbia, Canada., Laule C; Radiology, University of British Columbia, Vancouver, British Columbia, Canada.; Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.; International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, British Columbia, Canada.; UBC MRI Research Center, University of British Columbia, Vancouver, British Columbia, Canada.; Pathology & Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
Jazyk: angličtina
Zdroj: Magnetic resonance in medicine [Magn Reson Med] 2023 May; Vol. 89 (5), pp. 1809-1824. Date of Electronic Publication: 2022 Dec 13.
DOI: 10.1002/mrm.29552
Abstrakt: Purpose: We investigated the correlation, reproducibility, and effect of white matter fiber orientation for three myelin-sensitive MRI techniques: magnetization transfer ratio (MTR), inhomogeneous magnetization transfer ratio (ihMTR), and gradient and spin echo-derived myelin water fraction (MWF).
Methods: We measured the three metrics in 17 white and three deep grey matter regions in 17 healthy adults at 3 T.
Results: We found a strong correlation between ihMTR and MTR (r = 0.70, p < 0.001) and ihMTR and MWF (r = 0.79, p < 0.001), and a weaker correlation between MTR and MWF (r = 0.54, p < 0.001). The dynamic range in white matter was greatest for MWF (2.0%-27.5%), followed by MTR (14.4%-23.2%) and then ihMTR (1.2%-5.4%). The average scan-rescan coefficient of variation for white matter regions was 0.6% MTR, 0.3% ihMTR, and 0.7% MWF in metric units; however, when adjusted by the dynamic range, these became 6.3%, 6.1% and 2.8%, respectively. All three metrics varied with fiber direction: MWF and ihMTR were lower in white matter fibers perpendicular to B 0 by 6% and 1%, respectively, compared with those parallel, whereas MTR was lower by 0.5% at about 40°, with the highest values at 90°. However, separating the apparent orientation dependence by white matter region revealed large dissimilarities in the trends, suggesting that real differences in myelination between regions are confounding the apparent orientation dependence measured using this method.
Conclusion: The strong correlation between ihMTR and MWF suggests that these techniques are measuring the same myelination; however, the larger dynamic range of MWF may provide more power to detect small differences in myelin.
(© 2022 International Society for Magnetic Resonance in Medicine.)
Databáze: MEDLINE
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