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Diffusion tensor MRI correlates with executive dysfunction in patients with ischaemic leukoaraiosis
M O'Sullivan1, R G Morris, B Huckstep
1Clinical Neuroscience, St George's Hospital Medical School, London SW17, UK.
Journal of Neurology, Neurosurgery, and Psychiatry
|February 18, 2004
Summary
Diffusion tensor imaging (DTI) better reflects cognitive decline in cerebral small vessel disease than traditional MRI. DTI measures of white matter integrity show stronger correlations with cognitive function, aiding in disease monitoring and treatment trials.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Cerebral small vessel disease is a primary cause of vascular dementia.
- Leukoaraiosis and lacunar infarcts are common MRI findings, but T2 lesion load poorly correlates with cognitive impairment.
- Diffusion tensor MRI (DTI) offers a potentially superior method for assessing white matter damage.
Purpose of the Study:
- To compare the correlation of DTI measures with cognitive performance against T2 lesion load.
- To determine if DTI correlations are independent of conventional MRI parameters.
Main Methods:
- 36 patients with ischaemic leukoaraiosis and 19 healthy controls underwent DTI, conventional MRI, and neuropsychological testing.
- Diffusion tensor imaging (DTI) and conventional MRI parameters were analyzed.
- Neuropsychological assessments evaluated cognitive function.
Main Results:
- Increased diffusivity was observed on DTI within lesions and normal-appearing white matter.
- Mean diffusivity in normal-appearing white matter significantly correlated with IQ and executive function (r = -0.46, p = 0.009).
- T2 lesion load did not correlate with cognitive scores, while brain volume showed the best correlation among conventional measures.
Conclusions:
- DTI measurements demonstrate a stronger correlation with cognitive function compared to conventional MRI.
- DTI may serve as a valuable surrogate marker for disease progression and treatment efficacy in clinical trials.
- White matter damage and disrupted connectivity are implicated in cognitive impairment in cerebral small vessel disease.