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Cerebrovascular Reactivity Measurement with Functional Near Infrared Spectroscopy.

Franck Amyot1, Cora Davis2, Mike Sangobowale3

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Functional near-infrared spectroscopy (fNIRS) offers a non-invasive, cost-effective method to assess cerebrovascular reactivity (CVR). This technology accurately maps microvasculature function, aiding in the diagnosis of conditions like traumatic brain injury.

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Physiology

Background:

  • Cerebrovascular reactivity (CVR) reflects the brain's microvasculature health and endothelial cell function.
  • Current CVR imaging methods are often costly and require specialized equipment and expertise.
  • CVR is a critical indicator of microvascular integrity and overall brain health.

Purpose of the Study:

  • To evaluate functional near-infrared spectroscopy (fNIRS) as a non-invasive tool for assessing cortical CVR.
  • To compare fNIRS-based CVR assessment with established, more resource-intensive methods.
  • To determine the feasibility of using fNIRS for mapping microvasculature function in conditions affecting brain health.

Main Methods:

  • Utilized fNIRS to monitor changes in oxyhemoglobin (HbO) and deoxyhemoglobin (HbR) in the cerebral microvasculature.
  • Administered a standardized vasoactive stimulus (inhaled 5% carbon dioxide) to healthy controls.
  • Assessed CVR in 15 healthy controls (HC) using the fNIRS-based approach.

Main Results:

  • fNIRS successfully monitored hemodynamic changes in response to CO2 inhalation.
  • The study demonstrated fNIRS's capability to map cortical CVR.
  • Results indicate fNIRS is a promising technology for assessing microvasculature function.

Conclusions:

  • fNIRS provides a non-invasive, accurate, portable, and cost-effective method for mapping cortical CVR.
  • This technology can assess microvasculature function, relevant for conditions like traumatic brain injury.
  • fNIRS shows potential for widespread clinical application in evaluating cerebrovascular health.