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Related Experiment Videos

Confocal scanning laser Doppler flowmetry: experiments in a model flow system

B C Chauhan1, F M Smith

  • 1Department of Ophthalmology, Dalhousie University, Halifax, Nova Scotia, Canada.

Journal of Glaucoma
|August 1, 1997
PubMed
Summary
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Confocal scanning laser Doppler flowmetry (SLDF) reliably measures retinal and optic nerve head blood flow within a specific operational range. This noninvasive technique demonstrates a linear relationship between measured and actual flow, crucial for hemodynamic assessments.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Accurate measurement of retinal and optic nerve head hemodynamics is critical for diagnosing and monitoring various ocular diseases.
  • Noninvasive techniques are preferred for their safety and ease of use in clinical settings.
  • Confocal scanning laser Doppler flowmetry (SLDF) presents a novel approach to assess ocular blood flow.

Purpose of the Study:

  • To validate the accuracy and reliability of confocal scanning laser Doppler flowmetry (SLDF) for measuring retinal and optic nerve head hemodynamics.
  • To determine the operational range and linearity of SLDF in quantifying blood flow.

Main Methods:

  • A controlled flow system using glass capillaries and a microliter syringe pump was established.
  • Skim milk was perfused through capillaries of varying diameters (25-705 microm) at different flow rates.

Related Experiment Videos

  • The Heidelberg Retina Flowmeter (HRF) was used to measure flow, and results were compared against actual flow rates.

    • Main Results:

    • The HRF demonstrated a linear relationship between measured and actual flow within the velocity range of approximately 0.08 to 1.0 mm/s.
    • Above 1.0 mm/s, the measured velocity deviated from linearity.
    • Measurement variability was low (3.57%-4.05%) and independent of the flow rate within the validated range.

    Conclusions:

    • Confocal scanning laser Doppler flowmetry (SLDF) provides reliable and linear measurements of blood flow within a defined operational velocity range.
    • SLDF is a promising noninvasive tool for assessing ocular hemodynamics.