Aging and white matter microstructure and macrostructure: A longitudinal multi-site diffusion MRI study of 1218 participants
Open accessAbstract
Quantifying the microstructural and macrostructural geometrical features of the human brain's connections is necessary for understanding normal aging and disease. Here, we examine brain white matter diffusion magnetic resonance imaging data from one cross-sectional and two longitudinal data sets totaling in 1218 subjects and 2459 sessions of people aged 50-97 years. Data was drawn from well-established cohorts, including the Baltimore Longitudinal Study of Aging data set, Cambridge Centre for Ageing Neuroscience data set, and the Vanderbilt Memory & Aging Project. Quantifying 4 microstructural features and, for the first time, 11 macrostructure-based features of volume, area, and length across 120 white matter pathways, we apply linear mixed effect modeling to investigate changes in pathway-specific features over time, and document large age associations within white matter. Conventional diffusion tensor microstructure indices are the most age-sensitive measures, with positive age associations for diffusivities and negative age associations with anisotropies, with similar patterns observed across all pathways. Similarly, pathway shape measures also change with age, with negative age associations for most length, surface area, and volume-based features. A particularly novel finding of this study is that while trends were homogeneous throughout the brain for microstructure features, macrostructural features demonstrated heterogeneity across pathways, whereby several projection, thalamic, and commissural tracts exhibited more decline with age compared to association and limbic tracts. The findings from this large-scale study provide a comprehensive overview of the age-related decline in white matter and demonstrate that macrostructural features may be more sensitive to heterogeneous white matter decline. Therefore, leveraging macrostructural features may be useful for studying aging and could facilitate comparisons in a variety of diseases or abnormal conditions.
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Multi-shell approaches, including NODDI, constrained NODDI (C-NODDI), and diffusion kurtosis imaging, provide model-dependent indices related to neurite organization, extracellular water, axonal density, and tissue integrity.
“Multi-shell approaches, including NODDI, constrained NODDI (C-NODDI), and diffusion kurtosis imaging, provide model-dependent indices related to neurite organization, extracellular water, axonal density, and tissue integrity (Alsameen et al., 2023; Raghavan et al., 2021; Schilling et al., 2022).”
From 40 Years of diffusion MRI in the brain: From history to emerging frontiers (2026) · cites this paper as Schilling et al., 2022
The Discussion (Age-related microstructural decline; page unavailable) says advanced diffusion models can measure neurite density, extracellular diffusivity, axonal dispersion, and diffusion non-Gaussianity, and links advanced modeling to data with multiple diffusion weightings. It does not identify NODDI, C-NODDI, or diffusion kurtosis imaging by name, or establish the specific claim about extracellular water. The Methods (Processing; page unavailable) report that this study extracted DTI microstructural metrics rather than those named approaches. (LLM, conf=0.87)
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About “axial” and “radial” diffusivities
Wheeler‐Kingshott, C. A. M., & Cercignani, M. (2009) · Magnetic Resonance in Medicine · doi:10.1002/mrm.21965 · Cited by 885 · see citing works
Tract-specific white matter degeneration in aging. The Rotterdam Study
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Self-citationExploratory voxel-based analysis of diffusion indices and hemispheric asymmetry in normal aging
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Cited by
Sorted by citations
Le Bihan, D. (2026) · Frontiers in Neuroscience · doi:10.3389/fnins.2026.1858655 · Cited by 1 · see citing works
40 Years of diffusion MRI in the brain: From history to emerging frontiers
Le Bihan, D. (2026) · Imaging Neuroscience · doi:10.1162/imag.a.1365
“Multi-shell approaches, including NODDI, constrained NODDI (C-NODDI), and diffusion kurtosis imaging, provide model-dependent indices related to neurite organization, extracellular water, axonal density, and tissue integrity ( Alsameen et al., 2023; Raghavan et al., 2021; Schilling et al., 2022).”
- Authors
- Schilling, K. G., Archer, D., Yeh, F.-C., Rheault, F., Cai, L. Y., Hansen, C., Yang, Q., Ramdass, K., Shafer, A. T., Resnick, S. M., Pechman, K. R., Gifford, K. A., Hohman, T. J., Jefferson, A., Anderson, A. W., Kang, H., & Landman, B. A.
- Affiliations
- Vanderbilt University Medical Center (US)
- Vanderbilt University (US)
- University of Pittsburgh (US)
- National Institute on Aging (US)
- Corresponding author
- Schilling, Kurt G.
- ORCID
- Venue
- Brain Structure and Function
- Published
- 2022-05-23
- Volume
- 227
- Issue
- 6
- Pages
- 2111-2125
- ISSN
- 1863-2653 (ISSN-L)
- 1863-2661
- PMC
- PMC9648053
- OpenAlex
- W4281288063
- Cited by
- 78
- References
- 7
- Citations by year
- 2026: 15 · 2025: 26 · 2024: 18 · 2023: 18 · 2022: 1
- FWCI
- 8.78
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Locations
- Brain Structure and Function (publishedVersion)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Science Foundation (#1452485)
- Foundation for the National Institutes of Health (R01EB017230)
- Topics
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
- Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
- Health Sciences › Medicine › Neurology › Cerebrovascular and genetic disorders
- Keywords
- brain aging, white matter microstructure, white matter tracts, diffusion MRI, age-related decline, anisotropy, commissural tracts, association tracts, longitudinal change
- MeSH terms
- Aging, Brain, Cross-Sectional Studies, Humans, Longitudinal Studies, Diffusion Magnetic Resonance Imaging, Diffusion Tensor Imaging, White Matter
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