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Biomolecular Imaging of Cellular Uptake of Nanoparticles using Multimodal Nonlinear Optical Microscopy
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A prototype hyperspectral system with a tunable laser source for retinal vessel imaging.

Sunni R Patel1, John G Flanagan, Ayda M Shahidi

  • 1Department of Ophthalmology and Vision Sciences, University Health Network, Toronto Western Hospital, Toronto, Canada. sunni_patel@hotmail.com

Investigative Ophthalmology & Visual Science
|July 4, 2013
PubMed
Summary

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This study shows that manual retinal reflectance measurements using a new hyperspectral camera are highly repeatable for arterioles and venules. This technology offers reliable data for future retinal oxygen saturation research.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Retinal reflectance measurements are crucial for assessing ocular health.
  • Hyperspectral imaging offers a novel approach to analyze retinal vasculature.
  • Accurate and repeatable measurements are essential for clinical applications.

Purpose of the Study:

  • To evaluate the technology of a prototype hyperspectral retinal camera.
  • To determine the within-session repeatability of manual retinal reflectance measurements.
  • To assess measurements of arterioles and venules in healthy volunteers.

Main Methods:

  • Six healthy volunteers underwent retinal imaging using a hyperspectral camera (500-600 nm).
  • Manual optical densities were extracted for first-degree arterioles and venules.
Keywords:
hyperspectral imagingrepeatabilityretinal imaging

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  • Repeatability was assessed using standard deviation of differences, coefficient of repeatability (COR), and intraclass correlation coefficient (ICC).

    • Main Results:

    • The standard deviations of differences ranged from 0.01 to 0.07 OD units for arterioles and venules.
    • The COR values indicated good repeatability, with ranges of 0.02-0.11 OD units for arterioles and 0.03-0.14 OD units for venules.
    • High reliability was confirmed with ICC values ranging from 63.7% to 94.4% (P < 0.001).

    Conclusions:

    • Manual optical density determination using the hyperspectral camera demonstrated very good intrasession repeatability.
    • The low variance in measurements provides a reliable basis for future retinal oxygen saturation studies.
    • Automation of image analysis is expected to further enhance measurement repeatability.