Regional changes of cortical mean diffusivities with aging after correction of partial volume effects
Open accessAbstract
Accurately measuring the cortical mean diffusivity (MD) derived from diffusion tensor imaging (DTI) at the comprehensive lobe, gyral and voxel level of young, elderly healthy brains and those with Alzheimer's disease (AD) may provide insights on heterogeneous cortical microstructural changes caused by aging and AD. Due to partial volume effects (PVE), the measurement of cortical MD is overestimated with contamination of cerebrospinal fluid (CSF). The bias is especially severe for aging and AD brains because of significant cortical thinning of these brains. In this study, we aimed to quantitatively characterize the unbiased regional cortical MD changes due to aging and AD and delineate the effects of cortical thinning of elderly healthy and AD groups on MD measurements. DTI and T1-weighted images of 14 young, 15 elderly healthy subjects and 17 AD patients were acquired. With the parcellated cortical gyri and lobes from T1 weighted image transformed to DTI, regional cortical MD of all subjects before and after PVE correction were measured. CSF contamination model was used to correct bias of MD caused by PVE. Compared to cortical MD of young group, significant increases of corrected MD for elderly healthy and AD groups were found only in frontal and limbic regions, respectively, while there were significant increases of uncorrected MD all over the cortex. Uncorrected MD are significantly higher in limbic and temporal gyri in AD group, compared to those in elderly healthy group but higher MD only remained in limbic gyri after PVE correction. Cortical thickness was also measured for all groups. The correlation slopes between cortical MD and thickness for elderly healthy and AD groups were significantly decreased after PVE correction compared to before correction while no significant change of correlation slope was detected for young group. It suggests that the cortical thinning in elderly healthy and AD groups is a significant contributor to the bias of uncorrected cortical MD measurement. The established comprehensive unbiased cortical MD profiles of young, elderly healthy subjects and AD patients at the lobe, gyral and voxel level may serve as clinical references for cortical microstructure.
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In older people and Alzheimer's disease patients, the probability of gray matter voxels to also contain cerebrospinal fluid signal increases due to brain atrophy.
“In older people and AD patients, the probability of GM voxels to also contain CSF signal increases due to brain atrophy (Jeon et al., 2012).”
From Mean diffusivity in cortical gray matter in Alzheimer's disease: The importance of partial volume correction (2018) · cites this paper as Jeon et al., 2012
Jeon et al. found that partial volume correction more strongly reduced gray matter mean diffusivity in elder and Alzheimer's disease participants than in younger participants.
“They found that PVC stronger reduced GM MD in elder and AD participants than in younger participants, but they did not examine the potential diagnostic value of corrected GM MD for AD.”
From Mean diffusivity in cortical gray matter in Alzheimer's disease: The importance of partial volume correction (2018) · cites this paper as Jeon et al. (2012)
Jeon et al. (2012) successfully applied the cerebrospinal fluid contamination model to gray matter mean diffusivity data of young, older, and Alzheimer's disease participants to correct for partial volume effects.
“Jeon et al. (2012) successfully applied this CSF contamination model to GM MD data of young and older participants and participants with AD to correct for partial volume effects.”
From Mean diffusivity in cortical gray matter in Alzheimer's disease: The importance of partial volume correction (2018) · cites this paper as Jeon et al. (2012)
Jeon et al. did not examine the potential diagnostic value of corrected gray matter mean diffusivity for Alzheimer's disease.
“They found that PVC stronger reduced GM MD in elder and AD participants than in younger participants, but they did not examine the potential diagnostic value of corrected GM MD for AD.”
From Mean diffusivity in cortical gray matter in Alzheimer's disease: The importance of partial volume correction (2018) · cites this paper as Jeon et al. (2012)
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- Authors
- Jeon, T., Mishra, V., Uh, J., Weiner, M., Hatanpaa, K. J., White, C. L., Zhao, Y. D., Lu, H., Diaz-Arrastia, R., & Huang, H.
- Affiliations
- The University of Texas Southwestern Medical Center (US)
- Corresponding author
- Huang, Hao
- ORCID
- Venue
- NeuroImage
- Publisher
- Elsevier BV
- Published
- 2012-09
- Volume
- 62
- Issue
- 3
- Pages
- 1705-1716
- ISSN
- 1053-8119 (ISSN-L)
- PMC
- PMC3574164
- OpenAlex
- W1997085955
- Cited by
- 34
- References
- 3
- Citations by year
- 2026: 4 · 2025: 5 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 4 · 2019: 2 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 3 · 2013: 4
- FWCI
- 2.42
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- NeuroImage (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- NIH (EB009545, 5UL1RR024982-02, MH092535, MH084021)
- NIH/NIA (P30AG12300)
- Topics
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
- Keywords
- brain aging, Alzheimer's disease, partial volume correction, cerebrospinal fluid contamination, cortical thinning, cortical thickness, diffusion tensor imaging, cortical microstructure, limbic cortex, frontal cortex, temporal cortex
- MeSH terms
- Aged, Aging, Alzheimer Disease, Brain Mapping, Cerebral Cortex, Female, Humans, Image Interpretation, Computer-Assisted, Male, Young Adult, Diffusion Tensor Imaging
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