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Related Experiment Video

Updated: Jun 9, 2026

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

MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges

Published on: December 17, 2014

Improved fMRI calibration: precisely controlled hyperoxic versus hypercapnic stimuli.

Clarisse I Mark1, Joseph A Fisher, G Bruce Pike

  • 1McConnell Brain Imaging Center, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada. clarisse.mark@mail.mcgill.ca

Neuroimage
|September 11, 2010
PubMed
Summary
This summary is machine-generated.

Precise control of blood gases improves functional MRI (fMRI) calibration for oxygen metabolism studies. This method enhances BOLD signal calibration under both hypercapnic and hyperoxic protocols, reducing variability compared to traditional methods.

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Area of Science:

  • Neuroimaging
  • Physiology
  • Biophysics

Background:

  • Functional magnetic resonance imaging (fMRI) calibration for estimating cerebral metabolic rate of oxygen (CMRO(2)) changes relies on hypercapnic-induced increases in cerebral blood flow (CBF).
  • Traditional hypercapnia (HC) methods alter inspired CO(2) concentrations without precise control of end-tidal partial pressures (P(ET)CO(2), P(ET)O(2)), leading to potential inaccuracies.
  • Isocapnic hyperoxia (HO) can modulate BOLD signals by reducing venous deoxyhemoglobin (dHb) without affecting CMRO(2) or CBF, offering an alternative calibration strategy.

Purpose of the Study:

  • To compare the calibration of BOLD signals using precise end-tidal targeting under an isocapnic hyperoxic protocol (HOP) versus an iso-oxic hypercapnic protocol (HCP).
  • To evaluate the impact of precise gas delivery on the variability of BOLD calibration constants.
  • To assess the efficacy of precise end-tidal targeting for fMRI studies of oxygen metabolism.

Main Methods:

  • Nine healthy volunteers underwent 3T fMRI scanning.
  • End-tidal gas concentrations (P(ET)CO(2), P(ET)O(2)) were precisely monitored.
  • BOLD and CBF signals (measured via arterial spin labeling - ASL) were acquired during graded HCP (P(ET)CO(2) increases) and HOP (P(ET)O(2) increases), alternating with normocapnic states.

Main Results:

  • The variability of the calibration constant under HOP (M(HOP)) was 0.3-0.5 times that of HCP (M(HCP)).
  • Variances in calibration constants (M(HCP), M(HOP)) using precise gas targeting were lower than those reported for traditional methods (M(HC), M(HO)).
  • Precise controlled gas delivery significantly improved BOLD signal calibration for both HCP and HOP protocols.

Conclusions:

  • Precise end-tidal gas targeting markedly improves BOLD signal calibration for fMRI studies of oxygen metabolism.
  • The isocapnic hyperoxic protocol (HOP) offers a more precise alternative for BOLD calibration compared to the iso-oxic hypercapnic protocol (HCP).
  • This controlled gas delivery approach enhances the reliability and accuracy of fMRI-based CMRO(2) estimations.