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Radiance modelling using the P3 approximation

D Dickey1, O Barajas, K Brown

  • 1Department of Surgery, Cross Cancer Institute, Edmonton, Alberta, Canada.

Physics in Medicine and Biology
|December 30, 1998
PubMed
Summary
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Radiance-based light dosimetry offers a faster, more practical alternative to current methods for photodynamic therapy (PDT). This approach enables quick tissue characterization, crucial for effective tumor treatment.

Area of Science:

  • Biomedical Optics
  • Photodynamic Therapy
  • Medical Physics

Background:

  • Effective photodynamic therapy (PDT) relies on accurate light dosimetry.
  • Current fluence-based methods are often time-consuming and impractical for clinical settings.
  • Monte Carlo simulations for radiance-based dosimetry, while effective, are computationally intensive.

Purpose of the Study:

  • To explore the P3 approximation as an analytical solution for radiance-based light dosimetry.
  • To assess the feasibility of using radiance-based dosimetry for rapid tissue optical characterization.
  • To compare the P3 approximation with existing fluence-based methods.

Main Methods:

  • Utilized P3 approximation for radiance and fluence calculations.
  • Employed a plane wave illuminated, semi-infinite medium geometry.

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  • Characterized an Intralipid-based tissue phantom with varying scatterer (Intralipid) and absorber (methylene blue) concentrations.

    • Main Results:

    • P3 approximation-derived radiance and fluence compared favorably with the Grosjean approximation.
    • Demonstrated successful optical characterization of the tissue phantom.
    • Validated radiance-based light dosimetry as a viable alternative approach.

    Conclusions:

    • The P3 approximation provides a computationally efficient analytical solution for radiance transport.
    • Radiance-based light dosimetry is a promising alternative for rapid and accurate tissue characterization in clinical PDT.
    • This method requires fewer invasive measurements and offers faster characterization compared to traditional techniques.