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Related Concept Videos

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Quantification of Collateral Supply with Local-AIF Dynamic Susceptibility Contrast MRI Predicts Infarct Growth.

Mira M Liu1,2, Niloufar Saadat3, Steven P Roth4

  • 1From the Department of Radiology Medical Physics (M.M.L., T.J.C.), University of Chicago, Chicago, Illinois Liusarkarm@uchicago.edu.

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Summary

A new local arterial input function (local-AIF) accurately quantifies collateral blood supply in ischemic stroke. This method improves assessment of tissue status and infarct progression compared to traditional global-AIF.

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Area of Science:

  • Neuroimaging
  • Cerebrovascular disease
  • Medical physics

Background:

  • Leptomeningeal collaterals offer compensatory blood flow in ischemic stroke, influencing treatment and infarct size.
  • Accurate quantification of collateral supply is crucial for understanding stroke pathophysiology and guiding therapy.

Purpose of the Study:

  • To test if a local arterial input function (local-AIF), accounting for delayed and dispersed flow, is necessary for quantifying collateral blood supply.
  • To compare the efficacy of local-AIF versus global-AIF in assessing tissue perfusion in stroke.

Main Methods:

  • Experiments utilized a preclinical middle cerebral artery occlusion model in rodents.
  • Dynamic susceptibility contrast MRI was performed, generating quantitative cerebral blood flow (qCBF) maps using both global-AIF and local-AIF.
  • Collateral recruitment was scored from angiograms, and infarct growth was measured using diffusion-weighted MRI.

Main Results:

  • Local-AIF qCBF showed a significantly stronger correlation with collateralization (R²=0.81) than global-AIF qCBF (R²=0.05).
  • Local-AIF qCBF was more strongly correlated with slower infarct progression (R²=0.79) compared to global-AIF qCBF (R²=0.02).

Conclusions:

  • A local-AIF, correcting for flow delay and dispersion, provides a more accurate assessment of tissue status and collateral supply in acute stroke.
  • These findings support the clinical use of local-AIF for quantitative perfusion assessment in occlusive cerebrovascular disease.