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Related Experiment Videos

Laserflowgraphy: a new visual blood flow meter utilizing a dynamic laser speckle effect

Y Yamamoto1, T Ohura, K Nohira

  • 1Department of Plastic and Reconstructive Surgery, School of Medicine, Hokkaido University.

Plastic and Reconstructive Surgery
|April 1, 1993
PubMed
Summary

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We created the laserflowgraph, a visual laser blood flow meter, to map blood flow distribution using dynamic laser speckle. This practical tool accurately assesses cutaneous blood flow, proving useful in clinical applications like flap monitoring.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Dermatology

Background:

  • Assessing cutaneous blood flow is crucial for various clinical applications, including flap monitoring.
  • Existing methods for blood flow measurement have limitations in terms of resolution, invasiveness, or real-time visualization.

Purpose of the Study:

  • To introduce and evaluate a novel visual laser blood flow meter, the laserflowgraph.
  • To demonstrate the device's capability in providing two-dimensional color graphic representations of blood flow distribution.
  • To assess the clinical utility of the laserflowgraph, particularly in flap monitoring.

Main Methods:

  • Development of the laserflowgraph utilizing a dynamic laser speckle effect for blood flow visualization.
  • Comparison of laserflowgraph measurements with the established 133Xe clearance method in normal volunteers.

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  • Evaluation of the device's depth penetration, reflecting flow in the papillary layer of the dermis.

    • Main Results:

    • The laserflowgraph demonstrated a significant correlation between its flow level readings and blood flow rates determined by the 133Xe clearance method.
    • The device accurately visualized blood flow distribution in two-dimensional color graphics.
    • The laserflowgraph was found to reflect blood flow within the skin's papillary dermal layer.

    Conclusions:

    • The laserflowgraph is a practical, reliable, and highly useful tool for assessing cutaneous blood flow.
    • The technology is expected to have broad applicability across various clinical fields.
    • The visual feedback provided by the laserflowgraph enhances its utility in real-time monitoring, such as in flap viability assessment.