Diffusion tensor imaging and cognitive function in older adults with no dementia.

Abstract:

OBJECTIVE:To determine the patterns of diffusivity associated with cognitive domain functions in older adults without dementia. METHODS:We studied older adults without dementia (n = 220) who underwent neuropsychometric testing and a diffusion tensor imaging (DTI) examination at 3 T in a cross-sectional study. Memory, language, attention/executive function, and visual-spatial processing domains were assessed within 4 months of the MRI examination. A fluid-attenuated inversion recovery-based DTI sequence that enabled uncontaminated cortical diffusion measurements was performed. Associations between cortical mean diffusivity (MD) and cognitive function were tested using voxel-based regression analysis. Association between tract diffusivity and cognitive function was tested with regions of interest drawn on color-coded fractional anisotropy (FA) maps. RESULTS:Memory function was associated with the medial temporal lobe cortical MD on voxel-based analysis (p < 0.001, corrected for multiple comparisons), and inferior longitudinal fasciculus and posterior and anterior cingulum FA on tract-based analysis (p < 0.001). Language function was associated with the left temporal lobe cortical MD (p < 0.001, corrected for multiple comparisons), inferior longitudinal fasciculus, fornix, and posterior cingulum FA (p < 0.05). Attention and executive function was associated with the posterior and anterior cingulum FA, and visual-spatial function was associated with posterior cingulum FA (p < 0.01). CONCLUSION:Specific cognitive domain functions are associated with distinct patterns of cortical and white matter diffusivity in elderly with no dementia. Posterior cingulum tract FA was associated with all 4 cognitive domain functions, in agreement with the hypothesis that the posterior cingulate cortex is the main connectivity hub for cognitive brain networks. Microstructural changes identified on DTI may be associated with neurodegenerative pathologies underlying cognitive changes in older adults without dementia.

journal_name

Neurology

journal_title

Neurology

authors

Kantarci K,Senjem ML,Avula R,Zhang B,Samikoglu AR,Weigand SD,Przybelski SA,Edmonson HA,Vemuri P,Knopman DS,Boeve BF,Ivnik RJ,Smith GE,Petersen RC,Jack CR Jr

doi

10.1212/WNL.0b013e31822313dc

subject

Has Abstract

pub_date

2011-07-05 00:00:00

pages

26-34

issue

1

eissn

0028-3878

issn

1526-632X

pii

WNL.0b013e31822313dc

journal_volume

77

pub_type

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