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Open Access 20-11-2023 | Original Article

Childhood development of brain white matter myelin: a longitudinal T1w/T2w-ratio study

Authors: Lillian M. Dipnall, Joseph Y. M. Yang, Jian Chen, Ian Fuelscher, Jeffrey M. Craig, Timothy J. Silk

Published in: Brain Structure and Function

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Abstract

Myelination of human brain white matter (WM) continues into adulthood following birth, facilitating connection within and between brain networks. In vivo MRI studies using diffusion weighted imaging (DWI) suggest microstructural properties of brain WM increase over childhood and adolescence. Although DWI metrics, such as fractional anisotropy (FA), could reflect axonal myelination, they are not specific to myelin and could also represent other elements of WM microstructure, for example, fibre architecture, axon diameter and cell swelling. Little work exists specifically examining myelin development. The T1w/T2w ratio approach offers an alternative non-invasive method of estimating brain myelin. The approach uses MRI scans that are routinely part of clinical imaging and only require short acquisition times. Using T1w/T2w ratio maps from three waves of the Neuroimaging of the Children’s Attention Project (NICAP) [N = 95 (208 scans); 44% female; ages 9.5–14.20 years] we aimed to investigate the developmental trajectories of brain white matter myelin in children as they enter adolescence. We also aimed to investigate whether longitudinal changes in myelination of brain WM differs between biological sex. Longitudinal regression modelling suggested non-linear increases in WM myelin brain wide. A positive parabolic, or U-shaped developmental trajectory was seen across 69 of 71 WM tracts modelled. At a corrected level, no significant effect for sex was found. These findings build on previous brain development research by suggesting that increases in brain WM microstructure from childhood to adolescence could be attributed to increases in myelin.
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Metadata
Title
Childhood development of brain white matter myelin: a longitudinal T1w/T2w-ratio study
Authors
Lillian M. Dipnall
Joseph Y. M. Yang
Jian Chen
Ian Fuelscher
Jeffrey M. Craig
Timothy J. Silk
Publication date
20-11-2023
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-023-02718-8