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A Novel Approach to Monitoring Graft Neovascularization in the Human Gingiva

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Microcirculation assessment using an individualized model for diffuse reflectance spectroscopy and conventional laser

Tomas Strömberg¹, Hanna Karlsson¹, Ingemar Fredriksson²

¹Linköping University, University Hospital, Department of Biomedical Engineering, Linköping 581 85, Sweden.

Journal of Biomedical Optics

|May 3, 2014

Summary

This study presents a fiber-optic probe for simultaneous microvascular blood flow and hemoglobin oxygenation assessment. The integrated system accurately measures these dynamics, offering a powerful tool for physiological research.

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Area of Science:

Biomedical Optics
Physiology
Microcirculation Research

Background:

Microvascular assessment requires simultaneous measurement of blood flow and hemoglobin oxygenation dynamics.
Current methods may lack the integrated capability for real-time stimulus response analysis.

Purpose of the Study:

To develop and evaluate a fiber-optic probe system for simultaneous co-registration of blood flow and hemoglobin oxygenation.
To assess microvascular responses during physiological challenges.

Main Methods:

Simultaneous recording of white light diffuse reflectance (DRS) and laser Doppler flowmetry (LDF) using a fiber-optic probe.
Analysis of DRS data with an inverse Monte Carlo algorithm and a three-layer adaptive skin model.
Evaluation on 33 healthy subjects during a 5-min systolic occlusion protocol.

Main Results:

The integrated system demonstrated accurate fitting of DRS spectra and reliable LDF perfusion measurements.
During occlusion, perfusion decreased rapidly, while oxygenation decreased slowly.
Post-occlusion, perfusion and oxygenation increased rapidly, with supranormal oxygenation indicating excess blood flow.

Conclusions:

The integrated DRS and LDF fiber-optic probe provides a powerful tool for simultaneous assessment of blood flow and oxygenation.
This system enables detailed analysis of microvascular dynamics in response to stimuli.
Findings highlight the dissociation between perfusion and oxygenation kinetics during occlusion and release.