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Scattering process in LDV from retinal vessels.

C E Riva, B L Petrig, R D Shonat

|June 16, 2010

Summary

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Laser Doppler velocimetry accurately measured retinal blood flow in cats. Preventing double laser light transmission yielded expected Doppler shift power spectra, validating a single scattering model.

Area of Science:

Ophthalmology
Biomedical Engineering
Laser Physics

Background:

Accurate measurement of retinal blood flow is crucial for diagnosing and monitoring various ocular diseases.
Laser Doppler velocimetry (LDV) offers a non-invasive method for assessing blood flow dynamics.
Understanding the optical properties of retinal vessels is essential for refining LDV techniques.

Purpose of the Study:

To apply Laser Doppler Velocimetry (LDV) for measuring blood flow in small retinal vessels (<120 microm) of a cat.
To investigate the influence of laser light transmission pathways on Doppler shift power spectra.
To validate theoretical models of blood flow in retinal vasculature.

Main Methods:

Utilized a linearly polarized Helium-Neon (He-Ne) laser as the incident beam for LDV.

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Last Updated: Jun 12, 2026

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Performed measurements on retinal vessels in a feline model.

Analyzed Doppler shift power spectra to assess red blood cell velocity profiles.

Main Results:

Successfully obtained Doppler shift power spectra from retinal vessels.
Demonstrated that preventing double transmission of laser light is critical for accurate measurements.
Observed that under single transmission conditions, spectra matched theoretical predictions for a parabolic velocity profile.

Conclusions:

Laser Doppler velocimetry is a viable technique for measuring blood flow in small retinal vessels.
The single scattering model accurately predicts Doppler shift power spectra when double transmission is avoided.
These findings support the use of LDV for in-vivo retinal blood flow analysis.