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Quantitative diffusion-weighted MR imaging in transient ischemic attacks.

Ayeesha K Kamal1, Alan Z Segal, Aziz M Uluğ

  • 1Department of Neurology, Weill Medical College of Cornell University, New York Presbyterian Hospital, 1300 York Avenue, New York, NY 10021, USA.

AJNR. American Journal of Neuroradiology
|October 10, 2002
PubMed
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Quantitative diffusion-weighted (DW) MRI detects subtle neuronal ischemia in patients with transient ischemic attack (TIA). This advanced imaging technique shows promise for early diagnosis and risk stratification, potentially improving stroke prevention strategies.

Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • Transient ischemic attack (TIA) carries a high risk of subsequent stroke.
  • Current diagnostic methods lack sensitivity for detecting subtle neuronal ischemia.
  • Effective therapies exist but require early and accurate diagnosis.

Purpose of the Study:

  • To investigate the utility of quantitative diffusion-weighted (DW) magnetic resonance (MR) imaging.
  • To assess its ability to detect subtle neuronal deficits caused by transient cerebral ischemia.
  • To evaluate its potential as a sensitive diagnostic tool for TIA.

Main Methods:

  • Twenty-eight patients diagnosed with TIA underwent conventional MR imaging, MR angiography, and DW MR imaging within 24 hours.
  • Quantitative diffusion values were calculated for affected brain regions and compared to unaffected contralateral regions.

Related Experiment Videos

  • Patients with positive conventional DW images were excluded from this specific analysis.

    • Main Results:

    • Quantitative DW imaging revealed abnormal decreases in the diffusion constant (9-26%, P <.05) in suspected ischemic brain regions.
    • These decreases were significant when compared to contralateral unaffected tissue and internal controls.
    • The technique demonstrated sensitivity in detecting diffusion deficits.

    Conclusions:

    • Quantitative DW imaging effectively depicts diffusion deficits in patients experiencing TIA.
    • This advanced imaging method shows potential for superior sensitivity compared to conventional DW imaging in detecting transient cerebral ischemia.
    • It may offer a more sensitive approach to diagnosing TIA and guiding therapeutic interventions.