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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
Published on: November 8, 2012
Exploring white matter microstructural alterations in mild cognitive impairment: a multimodal diffusion MRI
Megan R Nelson1,2, Elizabeth G Keeling1,2, Ashley M Stokes1
1Division of Neuroimaging Research, Barrow Neurological Institute, Phoenix, AZ, United States.
Background:
Mild Cognitive Impairment (MCI) is a transitional stage from normal aging to dementia, characterized by noticeable changes in cognitive function that do not significantly impact daily life. Diffusion MRI (dMRI) plays a crucial role in understanding MCI by assessing white matter integrity and revealing early signs of axonal degeneration and myelin breakdown before cognitive symptoms appear.
Methods:
This study utilized the Alzheimer's Disease Neuroimaging Initiative (ADNI) database to compare white matter microstructure in individuals with MCI to cognitively normal (CN) individuals, employing advanced dMRI techniques such as diffusion kurtosis imaging (DKI), mean signal diffusion kurtosis imaging (MSDKI), and free water imaging (FWI).
Results:
Analyzing data from 55 CN subjects and 46 individuals with MCI, this study found significant differences in white matter integrity, particularly in free water levels and kurtosis values, suggesting neuroinflammatory responses and microstructural integrity disruption in MCI. Moreover, negative correlations between Mini-Mental State Examination (MMSE) scores and free water levels in the brain within the MCI group point to the potential of these measures as early biomarkers for cognitive impairment.
Conclusion:
In conclusion, this study demonstrates how a multimodal advanced diffusion imaging approach can uncover early microstructural changes in MCI, offering insights into the neurobiological mechanisms behind cognitive decline.
Insights
Advanced diffusion MRI reveals early white matter changes in Mild Cognitive Impairment (MCI). Increased free water and altered kurtosis suggest neuroinflammation and microstructural disruption, potentially serving as early biomarkers for cognitive decline.
Area of Science:
- Neuroimaging
- Neuroscience
- Biomarkers
Background:
- Mild Cognitive Impairment (MCI) represents a preclinical stage between normal aging and dementia.
- Characterized by subtle cognitive changes, MCI precedes significant daily life impairment.
- Diffusion MRI (dMRI) is vital for detecting early white matter integrity loss in MCI.
Purpose of the Study:
- To investigate white matter microstructure differences between MCI and cognitively normal (CN) individuals.
- To apply advanced dMRI techniques for enhanced sensitivity in detecting microstructural changes.
- To identify potential imaging biomarkers for early MCI detection.
Main Methods:
- Utilized the Alzheimer's Disease Neuroimaging Initiative (ADNI) database.
- Compared white matter microstructure in 46 MCI subjects and 55 CN subjects.
- Employed advanced dMRI techniques: diffusion kurtosis imaging (DKI), mean signal diffusion kurtosis imaging (MSDKI), and free water imaging (FWI).
Main Results:
- Found significant differences in white matter integrity between MCI and CN groups.
- Observed elevated free water levels and altered kurtosis values in MCI subjects.
- Correlated lower Mini-Mental State Examination (MMSE) scores with higher brain free water levels in the MCI group.
Conclusions:
- Multimodal advanced diffusion imaging effectively detects early microstructural changes in MCI.
- Findings suggest neuroinflammation and microstructural integrity disruption in MCI.
- Advanced dMRI metrics show promise as early biomarkers for cognitive impairment.
