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Updated: Jun 13, 2025

Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers
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AAPM Task Group Report 274: Fluence rate dosimetry for photodynamic therapy (PDT).

Timothy C Zhu1, Brian W Pogue2, Andreea Dimofte1

  • 1University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Medical Physics
|January 16, 2025
PubMed
Summary

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Photodynamic therapy (PDT) uses light to treat various conditions. Accurate measurement of light dose, or fluence rate, is crucial for effective treatment and requires specialized dosimetry equipment.

Area of Science:

  • Biomedical Optics
  • Photodynamic Therapy
  • Medical Physics

Background:

  • Photodynamic therapy (PDT) is an approved treatment for cancers, precancerous conditions, and benign diseases.
  • Clinical use of PDT is limited, despite significant research interest.
  • PDT efficacy depends on absorbed light energy, making fluence rate measurement critical.

Purpose of the Study:

  • To review current technologies for measuring light fluence rate in tissue for PDT.
  • To describe available detectors and their operational principles.
  • To recommend calibration, quality assurance, and clinical implementation guidelines for dosimetry.

Main Methods:

  • Review of state-of-the-art fluence rate dosimetry technology.
  • Description of scattering-tip and fluorescence-based detectors.
Keywords:
TG274in vivo dosimetrylight fluencephotodynamic therapy

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  • Analysis of principles of operation for each detector type.

    • Main Results:

    • Fluence rate in tissue can differ significantly from incident irradiance due to scattering and absorption.
    • Patient and tissue variations impact light dose delivery.
    • Two primary detector types, scattering-tip and fluorescence-based, are available for fluence rate measurement.

    Conclusions:

    • Accurate fluence rate dosimetry is essential for optimizing PDT.
    • Standardized calibration and quality assurance procedures are needed for clinical dosimetry equipment.
    • Guidelines for clinical implementation of fluence rate dosimetry will enhance PDT efficacy and safety.