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Advances in penumbra imaging with MR.

Stephen M Davis1, Geoffrey A Donnan

  • 1Department of Neurology, Royal Melbourne Hospital, Parkville, Vic., Australia. stephen.davis@mh.org.au

Cerebrovascular Diseases (Basel, Switzerland)
|January 20, 2004
PubMed
Summary

Magnetic Resonance Imaging (MRI) helps identify the ischaemic penumbra, or potentially viable brain tissue, after stroke. This imaging technique aids in predicting treatment benefits for stroke patients.

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • The ischaemic penumbra, defined as hypoperfused yet viable brain tissue, has been a key concept in stroke research for over 25 years.
  • Recent advancements utilize perfusion-weighted imaging (PWI) and diffusion-weighted imaging (DWI) to map this critical area.

Purpose of the Study:

  • To explore the utility of MRI-based penumbral imaging in identifying salvageable brain tissue.
  • To assess the potential of penumbral imaging in predicting treatment efficacy for stroke.

Main Methods:

  • Utilizing a combination of PWI and DWI to delineate the ischaemic core and penumbra.
  • Employing the PWI > DWI mismatch as an operational definition of the penumbra.
  • Analyzing MRI penumbral signatures within 6 hours of stroke onset.

Main Results:

  • An MRI penumbral signature is detectable in most patients within 6 hours of stroke onset.
  • The PWI > DWI mismatch definition has been refined to account for benign oligaemia and salvageable core tissue.
  • Pilot studies suggest penumbral imaging may predict benefit from thrombolytic therapy beyond 3 hours.

Conclusions:

  • MRI-based penumbral imaging offers a physiological 'tissue clock' for stroke management.
  • Penumbral imaging may guide therapeutic decisions for thrombolysis and neuroprotection.
  • DWI and PWI parameters are valuable in proof-of-principle stroke trials, enabling efficient efficacy assessment.

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