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Cerebrovascular Reserve Imaging: Problems and Solutions.

David J Mikulis1

  • 1The Krembil Brain Institute, Institute of Medcial Science, Department of Medical Imaging, The University of Toronto, The University Health Network, The Toronto Western Hospital, 399 Bathurst Street, Room 3MC-431, Toronto, ON M5T 2S8, Canada.

Magnetic Resonance Imaging Clinics of North America
|November 25, 2023
PubMed
Summary
This summary is machine-generated.

Assessing cerebrovascular steno-occlusive disease with resting blood flow metrics is unreliable for complex cases. A new cerebrovascular reactivity method using a vasodilatory stimulus improves accuracy for better patient management.

Keywords:
CT perfusion imagingCerebral blood flowCerebrovascular diseaseCerebrovascular reactivityMR perfusion imaging

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Area of Science:

  • Neurology
  • Medical Imaging
  • Vascular Medicine

Background:

  • Current methods for assessing cerebrovascular steno-occlusive disease rely on resting blood flow metrics from MR and CT imaging.
  • These methods show decreased reliability with increasing stenosis severity and number.
  • Resting flow metrics fail to account for potential shortfalls in recruitable blood flow or increased metabolic demand in collateralized circulations.

Purpose of the Study:

  • To introduce a clinically validated solution for assessing cerebrovascular steno-occlusive disease.
  • To improve the reliability and accuracy of blood flow assessments in complex cases.
  • To enhance patient management through more precise diagnostic capabilities.

Main Methods:

  • Utilized cerebrovascular reactivity methodology.
  • Applied a quantifiable vasodilatory stimulus.
  • Focused on improving reproducibility and repeatability of measurements.

Main Results:

  • The proposed cerebrovascular reactivity methodology offers a clinically tested solution.
  • The method addresses limitations of resting blood flow metrics in assessing collateralized circulations.
  • Improved reproducibility and repeatability were achieved, essential for clinical application.

Conclusions:

  • Cerebrovascular reactivity assessment provides a more reliable method for evaluating patients with cerebrovascular steno-occlusive disease.
  • This approach overcomes the limitations of traditional resting blood flow measurements.
  • The enhanced accuracy supports optimized clinical decision-making and patient care.