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Related Experiment Video

Updated: Sep 24, 2025

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Hyperspectral wide-field-of-view imaging to study dynamic microcirculatory changes during hypoxia.

Alfredo Lucas1,2, Carlos Munoz2, Pedro Cabrales2

  • 1Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.

American Journal of Physiology. Heart and Circulatory Physiology
|May 6, 2022
PubMed
Summary

Hyperspectral imaging (HSI) enables rapid, noninvasive assessment of vascular microcirculation. This new system quanties hemoglobin oxygen saturation in large areas, advancing our understanding of tissue oxygen delivery.

Keywords:
functional imaginghyperspectral imagingin vivo microscopy functional imagingmicrocirculationspectroscopy

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Area of Science:

  • Physiology
  • Biomedical Engineering
  • Optical Imaging

Background:

  • Vascular microcirculation is crucial for tissue oxygenation.
  • Noninvasive methods are needed to study microcirculation dynamics.
  • Current hyperspectral imaging (HSI) techniques have limitations in field-of-view.

Purpose of the Study:

  • To present a novel benchtop hyperspectral imaging (HSI) system for large-field-of-view microcirculation imaging.
  • To demonstrate the system's capability in assessing dynamic changes in microvascular hemoglobin oxygen saturation.
  • To validate HSI measurements against phosphorescence quenching microscopy.

Main Methods:

  • Utilized an off-the-shelf linear scanning HSI system with perpendicular detector displacement.
  • Acquired wide-field images of microcirculatory preparations.
  • Analyzed spectral data to quantify hemoglobin oxygen saturation and vascular morphology during induced hypoxia/reoxygenation.

Main Results:

  • The HSI system successfully mapped larger areas of microcirculation.
  • Dynamic changes in microvascular hemoglobin oxygen saturation were recorded.
  • HSI-derived HbO2 saturations showed strong correlation with phosphorescence quenching microscopy.
  • Acquisition speeds were comparable to existing spectral-scanning HSI systems.

Conclusions:

  • The developed HSI system provides a fast, reliable, and noninvasive method for dynamic functional imaging of microcirculation.
  • This technique allows for broad experimental and clinical applications in studying tissue oxygen delivery.
  • The novel setup and algorithm enhance the understanding of microcirculatory function in vivo.