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Related Experiment Video

Updated: Mar 11, 2026

MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges
09:33

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Published on: December 17, 2014

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Cerebrovascular reactivity mapping without gas challenges.

Peiying Liu1, Yang Li2, Marco Pinho3

  • 1Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.

Neuroimage
|November 27, 2016
PubMed
Summary
This summary is machine-generated.

A new resting-state method accurately maps cerebrovascular reactivity (CVR) using natural breathing variations, offering a practical alternative to gas inhalation for diagnosing vascular deficits.

Keywords:
Cerebrovascular reactivityGlobal signalHypercapnia (CO(2)) inhalationMoyamoya diseaseResting-state BOLD fMRISpontaneous CO(2) fluctuation

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Area of Science:

  • Neuroimaging
  • Vascular Neurology
  • Biomedical Engineering

Background:

  • Cerebrovascular reactivity (CVR) assessment is crucial for diagnosing cerebrovascular conditions.
  • Conventional CVR mapping relies on hypercapnic gas inhalation, posing practical challenges for routine clinical use.
  • A non-invasive, resting-state method for CVR mapping is needed.

Purpose of the Study:

  • To develop and validate a novel method for mapping CVR using resting-state BOLD MRI data without gas inhalation.
  • To identify a surrogate for arterial CO2 fluctuations during spontaneous breathing.
  • To assess the feasibility, reproducibility, and clinical utility of the resting-state CVR method.

Main Methods:

  • Identified a surrogate for arterial CO2 fluctuation from global BOLD signal variations during spontaneous breathing.
  • Estimated voxel-wise CVR using this surrogate as a regressor.
  • Validated the resting-state CVR maps against conventional hypercapnic CVR maps in healthy volunteers and patients with Moyamoya disease.

Main Results:

  • Global BOLD signal fluctuation (0.02-0.04Hz) reflects natural arterial CO2 variations.
  • Resting-state CVR maps showed high reproducibility (ICC=0.91±0.06) and strong correlation with hypercapnic CVR in healthy subjects (r=0.88).
  • The method detected vasodilatory deficits in Moyamoya disease patients, consistent with the conventional method (r=0.71±0.18).

Conclusions:

  • Resting-state BOLD signal variations can serve as a surrogate for CO2 changes to map CVR.
  • This novel method offers a reproducible and clinically feasible alternative to gas-induced CVR assessment.
  • Resting-state CVR mapping is a promising tool for detecting cerebrovascular deficits when gas challenge is impractical.