RT Journal Article
SR Electronic
T1 The Contributions of MRI-Based Measures of Gray Matter, White Matter Hyperintensity, and White Matter Integrity to Late-Life Cognition
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 1797
OP 1803
DO 10.3174/ajnr.A3048
VO 33
IS 9
A1 J. He
A1 V.S.S. Wong
A1 E. Fletcher
A1 P. Maillard
A1 D.Y. Lee
A1 A.-M. Iosif
A1 B. Singh
A1 O. Martinez
A1 A.E. Roach
A1 S.N. Lockhart
A1 L. Beckett
A1 D. Mungas
A1 S.T. Farias
A1 O. Carmichael
A1 C. DeCarli
YR 2012
UL http://www.ajnr.org/content/33/9/1797.abstract
AB BACKGROUND AND PURPOSE: GM volume, WMH volume, and FA are each associated with cognition; however, few studies have detected whether these 3 different types of MR imaging measurements exert independent or additive effects on cognitive performance. To detect their extent of contribution to cognitive performance, we explored the independent and additive contributions of GM atrophy, white matter injury, and white matter integrity to cognition in elderly patients. MATERIALS AND METHODS: Two hundred and 9 elderly patients participated in the study: 97 were CN adults, 65 had MCI, and 47 had dementia. We measured GM on T1-weighted MR imaging, WMH on FLAIR, and FA on DTI, along with psychometrically matched measures of 4 domains of cognitive performance, including semantic memory, episodic memory, executive function, and spatial abilities. RESULTS: As expected, patients with dementia performed significantly more poorly in all 4 cognitive domains, whereas patients with MCI performed generally less poorly than dementia patients, though considerable overlap in performance was present across groups. GM, FA, and WMH each differed significantly between diagnostic groups and were associated with cognitive measures. In multivariate models that included all 3 MR imaging measures (GM, WMH, and FA), GM volume was the strongest determinant of cognitive performance. CONCLUSIONS: These results strongly suggest that MR imaging measures of GM are more closely associated with cognitive function than WM measures across a broad range of cognitive and functional impairment. ADAlzheimer DiseaseCCcorpus callosumCNcognitively normalFAfractional anisotropyGMgray matterICCintraclass correlation coefficientMCImild cognitive impairmentMDTminimum deformation templateRSrecruitment sourceSLF-FPsuperior longitudinal fasciculus, frontal partTCVtotal cranial volumeUNCuncinate fasciculusWMHwhite matter hyperintensity