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Related Experiment Videos

Performance evaluation of cylindrical fiber optic light diffusers for biomedical applications.

Leonid M Vesselov1, William Whittington, Lothar Lilge

  • 1Walsh Medical Devices, Inc., 1200 South Service Road, West Unit 3, Oakville, Ontario, Canada, L6L 5T7.

Lasers in Surgery and Medicine
|April 15, 2004
PubMed
Summary

Accurate light dosimetry requires understanding optical fiber diffuser emission. This study found significant variations in azimuth emission, potentially leading to inaccurate treatments in photodynamic therapy and other applications.

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Area of Science:

  • Biomedical optics
  • Medical physics
  • Photomedicine

Background:

  • Accurate dosimetry for light-based therapies relies on precise knowledge of light source emission.
  • Manufacturer-provided data for cylindrical diffusers is often incomplete, hindering precise dosimetry.
  • End-user characterization of diffuser emission is crucial but not routinely performed.

Purpose of the Study:

  • To evaluate the photometric emission characteristics of commercial cylindrical optical fiber diffusers.
  • To assess the isotropy of light emission along the diffuser length, around its circumference (polar angle), and in the azimuth direction.
  • To highlight the impact of emission variability on treatment accuracy.

Main Methods:

  • Commercial cylindrical diffusers (1-2 cm active length, <=1 mm diameter) were photometrically tested.

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  • Light intensity was measured along the diffuser length and around its circumference (polar angle).
  • Azimuth emission patterns were specifically measured to quantify directional variability.

    • Main Results:

    • Light emission distribution is manufacturer-specific.
    • While polar isotropy is often good, azimuth isotropy can vary by over a factor of 5.
    • Poor azimuth isotropy can lead to over-treatment of tissue distal to the diffuser placement.

    Conclusions:

    • Standardization of emission property reporting for optical fiber diffusers is essential.
    • This standardization is critical for accurate light dosimetry and treatment planning.
    • Applications like photodynamic therapy, interstitial laser hyperthermia, and photocoagulation require reliable diffuser characterization.