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. 2004 Dec;75(12):1714–1718. doi: 10.1136/jnnp.2003.033852

Temporal evolution of water diffusion parameters is different in grey and white matter in human ischaemic stroke

S Maniega 1, M Bastin 1, P Armitage 1, A Farrall 1, T Carpenter 1, P Hand 1, V Cvoro 1, C Rivers 1, J Wardlaw 1
PMCID: PMC1738833  PMID: 15548489

Abstract

Objectives: Our purpose was to investigate whether differences exist in the values and temporal evolution of mean diffusivity (<D>) and fractional anisotropy (FA) of grey and white matter after human ischaemic stroke.

Methods: Thirty two patients with lesions affecting both grey and white matter underwent serial diffusion tensor magnetic resonance imaging (DT-MRI) within 24 hours, and at 4–7 days, 10–14 days, 1 month, and 3 months after stroke. Multiple small circular regions of interest (ROI) were placed in the grey and white matter within the lesion and in the contralateral hemisphere. Values of <D>{grey}, <D>{white}, FA{grey} and FA{white} were measured in these ROI at each time point and the ratios of ischaemic to normal contralateral values (<D>R and FAR) calculated.

Results: <D> and FA showed different patterns of evolution after stroke. After an initial decline, the rate of increase of <D>{grey} was faster than <D>{white} from 4–7 to 10–14 days. FA{white} decreased more rapidly than FA{grey} during the first week, thereafter for both tissue types the FA decreased gradually. However, FA{white} was still higher than FA{grey} at three months indicating that some organised axonal structure remained. This effect was more marked in some patients than in others. <D>R{grey} was significantly higher than <D>R{white} within 24 hours and at 10–14 days (p<0.05), and FAR{white} was significantly more reduced than FAR{grey} at all time points (p<0.001).

Conclusions: The values and temporal evolution of <D> and FA are different for grey and white matter after human ischaemic stroke. The observation that there is patient-to-patient variability in the degree of white matter structure remaining within the infarct at three months may have implications for predicting patient outcome.

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Selected References

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