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Multiple-fiber probe design for fluorescence spectroscopy in tissue.

T Joshua Pfefer1, Kevin T Schomacker, Marwood N Ediger

  • 1Wellman Laboratories of Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston 02114, USA. josh@eob.cdrh.fda.gov

Applied Optics
|August 3, 2002
PubMed
Summary

Fiber-optic probes are crucial for fluorescence spectroscopy. Probe design significantly impacts how deep light penetrates tissue and where fluorescence is detected, suggesting customization for better diagnostic device performance.

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Area of Science:

  • Biomedical Optics
  • Spectroscopy
  • Medical Diagnostics

Background:

  • Fiber-optic probes are vital for quantitative fluorescence spectroscopy.
  • Illumination-collection geometry is critical but understudied for probe design.

Purpose of the Study:

  • To investigate how multifiber probe design parameters affect light propagation and fluorescence detection.
  • To guide the optimization of fiber-optic probes for fluorescence-based diagnostics.

Main Methods:

  • Utilized a Monte Carlo model to simulate light propagation and fluorescence origin.
  • Investigated parameters: numerical aperture, fiber diameter, separation distance, and spacer thickness.
  • Simulated excitation at 400 nm and emission at 630 nm.

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Main Results:

  • Decreasing fiber size enhanced axial selectivity.
  • Increasing spacer thickness shifted sensitivity from subsurface to a monotonic decrease.
  • Probe design critically influences tissue interrogation depth and sensitivity.

Conclusions:

  • Fiber-optic probe design parameters significantly alter light-tissue interactions.
  • Customizing probe geometry can improve the efficacy of fluorescence diagnostic devices.