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Related Experiment Videos

Diffusion-weighted MRI for evaluation of acute stroke

G W Albers1

  • 1Department of Neurology and Neurological Sciences and the Stanford Stroke Center, Stanford University Medical Center, CA 94304, USA.

Neurology
|September 23, 1998
PubMed
Summary

Diffusion-weighted imaging (DWI) detects changes in apparent diffusion coefficient (ADC) in ischemic stroke. This MRI technique aids in early lesion detection, outcome prediction, and treatment evaluation.

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • Diffusion-weighted imaging (DWI) is an advanced MRI technique.
  • It measures water molecule diffusion to calculate the apparent diffusion coefficient (ADC) map.
  • Acute ischemic stroke causes cytotoxic edema, significantly reducing ADC values.

Purpose of the Study:

  • To evaluate the utility of DWI in detecting and characterizing ischemic stroke.
  • To assess the correlation between DWI lesion volume and clinical outcomes.
  • To determine DWI's potential in patient selection for stroke therapies and treatment efficacy evaluation.

Main Methods:

  • Utilizing diffusion-weighted imaging (DWI) to assess brain tissue.
  • Calculating apparent diffusion coefficient (ADC) maps.

Related Experiment Videos

  • Analyzing ADC value changes over time post-stroke onset.

    • Main Results:

    • ADC values decrease acutely post-ischemic stroke due to cytotoxic edema.
    • ADC values return to pseudonormal levels around 1 week, then elevate chronically.
    • Early DWI lesions show high correlation with clinical neurologic outcome and final infarct volume.

    Conclusions:

    • DWI is highly sensitive for detecting and localizing acute ischemic brain lesions.
    • It effectively differentiates acute from chronic infarcts.
    • DWI facilitates patient selection for stroke therapies and aids in evaluating treatment efficacy.