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Related Experiment Videos

Micro-light guides: a new method for measuring tissue fluorescence and reflectance.

S Ji, B Chance, K Nishiki

    The American Journal of Physiology
    |March 1, 1979
    PubMed
    Summary

    Researchers developed novel micro-light guides using optical fibers for biological measurements. These guides provide comparable results to larger ones, enabling accurate NADH fluorescence and UV reflectance analysis in various biological samples.

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    Area of Science:

    • Biomedical Optics
    • Biophysics
    • Medical Instrumentation

    Background:

    • Conventional light guides can be cumbersome for certain biological measurements.
    • Accurate optical measurements of biological tissues are crucial for understanding physiological processes.
    • NADH fluorescence and UV reflectance provide insights into cellular metabolic state and tissue oxygenation.

    Purpose of the Study:

    • To develop and evaluate novel micro-light guides for optical measurements in biological systems.
    • To compare the performance of micro-light guides with conventional larger light guides.
    • To investigate and correct for light scattering effects in fluorescence measurements.

    Main Methods:

    • Construction of three-way micro-light guides with 25- or 80-micron optical fibers.

    Related Experiment Videos

  • Measurement of NADH fluorescence and UV reflectance from mitochondrial suspensions, perfused rat liver, and rabbit interventricular septum.
  • Determination of light scattering effects and derivation of a correction equation for fluorescence.
  • Mathematical modeling of a two-way micro-light guide's optical behavior.

    • Main Results:

    • Micro-light guides yielded optical change measurements comparable to conventional light guides.
    • An empirical equation was derived to correct fluorescence measurements for light scattering in mitochondrial suspensions.
    • A mathematical model accurately described the optical behavior of a two-way micro-light guide for reflectance and fluorescence.

    Conclusions:

    • Micro-light guides offer a viable alternative to conventional guides for sensitive optical measurements in biological research.
    • The developed methods allow for accurate optical characterization of biological samples, even with scattering present.
    • The mathematical models provide a framework for understanding and optimizing micro-light guide performance.