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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Cognitive aging, executive function, and fractional anisotropy: a diffusion tensor MR imaging study.
S M Grieve1, L M Williams, R H Paul
1The Brain Resource International Database, The Brain Resource Company, Ultimo, Australia. sgrieve@gmp.usyd.edu.au
AJNR. American Journal of Neuroradiology
|February 14, 2007
Summary
Fractional anisotropy (FA) in brain regions like the frontal lobe declines with age, correlating with reduced executive function. This finding suggests FA may help detect age-related cognitive changes early.
Area of Science:
- Neuroimaging
- Cognitive Neuroscience
- Brain Aging Research
Background:
- Fractional anisotropy (FA) from diffusion tensor imaging (DTI) quantifies brain connectivity.
- Cognitive function naturally changes with age, but the underlying structural basis requires further exploration.
Purpose of the Study:
- To investigate the relationship between FA and cognitive measures in a broad age range.
- To explore the structural underpinnings of age-related cognitive decline.
Main Methods:
- Generated FA images from DTI data in 87 healthy adults (20-73 years).
- Employed regional and voxel-based analyses to examine FA-cognition relationships.
Main Results:
- Significant negative association between age and FA in frontal, parietal, and temporal lobes (not occipital).
- FA declined ~3% per decade in prefrontal regions.
- Lower FA in frontal, temporal, and parietal lobes correlated with poorer executive function and attention.
Conclusions:
- Demonstrated a link between FA and executive function, a key aspect of cognitive aging.
- FA may serve as an early indicator for age-related cognitive changes.
- Further prospective studies are needed to validate these findings.
