White matter hyperintensity (WMH) shape has been associated with the severity of the underlying brain pathology, suggesting it is a potential neuroimaging marker of WMH impact on brain function. In 563 patients with vascular disease (58 ± 10 years), we examined the relationship between WMH volume, shape, and cognitive functioning. WMH volume and shape were automatically determined on 1.5T brain MRI data. Standardized linear regression analyses estimated the association between WMH volume and shape (concavity index, solidity, convexity, fractal dimension, and eccentricity) and memory and executive functioning, adjusted for age, sex, educational level, and reading ability. Larger WMH volumes were associated with lower executive functioning Z-scores (b (95%-CI): -0.09 (-0.17;-0.01)). Increased shape complexity of periventricular/confluent WMH associated with lower executive functioning (concavity index +1SD: -0.13 (-0.20;-0.06); solidity -1SD: -0.09 (-0.17;-0.02)) and lower memory function (fractal dimension +1SD: -0.10 (-0.18;-0.02)). Of note, the association between concavity index and executive functioning was independent of WMH volume (-0.12 (-0.19;-0.04)). Our results suggest that WMH shape contains additional information about WMH burden, not otherwise captured by WMH volume.

Copyright © 2022. Published by Elsevier Inc.

Overview publication

TitleWhite matter hyperintensity shape is associated with cognitive functioning – the SMART-MR study.
DateDecember 1st, 2022
Issue nameNeurobiology of aging
Issue numberv120:81-87
DOI10.1016/j.neurobiolaging.2022.08.009
PubMed36152446
AuthorsZwartbol MHT, Ghaznawi R, Jaarsma-Coes M, Kuijf H, Hendrikse J, de Bresser J & Geerlings MI
KeywordsAging, Cognitive functioning, MRI, SMART-MR study, Shape analysis, White matter hyperintensities
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