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White matter hyperintensity shape is associated with cognitive functioning - the SMART-MR study.

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White matter hyperintensity (WMH) shape provides crucial insights into brain pathology and cognitive function. Complex WMH shapes correlate with poorer executive function and memory, independent of WMH volume.

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Area of Science:

  • Neuroimaging
  • Neurology
  • Radiology

Background:

  • White matter hyperintensities (WMH) are common in vascular disease and impact brain function.
  • WMH shape characteristics may offer additional diagnostic information beyond volume.

Purpose of the Study:

  • To investigate the association between WMH volume, shape complexity, and cognitive functions (memory and executive function) in patients with vascular disease.
  • To determine if WMH shape provides unique information about cognitive impairment not captured by WMH volume alone.

Main Methods:

  • Analysis of 1.5T brain MRI data from 563 patients with vascular disease.
  • Automated quantification of WMH volume and shape parameters (concavity index, solidity, convexity, fractal dimension, eccentricity).
  • Standardized linear regression models adjusted for age, sex, education, and reading ability.

Main Results:

  • Larger WMH volumes were associated with lower executive functioning.
  • Increased shape complexity (e.g., higher concavity index, lower solidity) of periventricular/confluent WMH correlated with reduced executive functioning.
  • Increased fractal dimension of WMH was linked to lower memory function.
  • The association between WMH concavity index and executive functioning was significant even after accounting for WMH volume.

Conclusions:

  • WMH shape complexity is a valuable neuroimaging marker for cognitive function in vascular disease.
  • WMH shape analysis offers complementary information to WMH volume for assessing brain pathology burden and its impact on cognition.