PDT dose dosimeter for pleural photodynamic therapy

Michele M. Kim, Arash Darafsheh, Mahmoud Ahmad, Jarod C. Finlay, Timothy C. Zhu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

14 Scopus citations


PDT dose is the product of the photosensitizer concentration and the light fluence in the target tissue. For improved dosimetry during plural photodynamic therapy (PDT), a PDT dose dosimeter was developed to measure both the light fluence and the photosensitizer concentration simultaneously in the same treatment location. Light fluence and spectral data were rigorously compared to other methods of measurement (e.g. photodiode, multi-fiber spectroscopy contact probe) to assess the accuracy of the measurements as well as their uncertainty. Photosensitizer concentration was obtained by measuring the fluorescence of the sensitizer excited by the treatment light. Fluence rate based on the intensity of the laser spectrum was compared to the data obtained by direct measurement of fluence rate by a fiber-coupled photodiode. Phantom studies were done to obtain an optical property correction for the fluorescence signal. Measurements were performed in patients treated Photofrin for different locations in the pleural cavity. Multiple sites were measured to investigate the heterogeneity of the cavity and to provide cross-validation via relative dosimetry. This novel method will allow for accurate real-time determination of delivered PDT dose and improved PDT dosimetry.

Original languageEnglish
Title of host publicationOptical Methods for Tumor Treatment and Detection
Subtitle of host publicationMechanisms and Techniques in Photodynamic Therapy XXV
EditorsTayyaba Hasan, David H. Kessel
ISBN (Electronic)9781628419283
StatePublished - 2016
EventOptical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXV - San Francisco, United States
Duration: Feb 13 2016Feb 14 2016

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceOptical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXV
Country/TerritoryUnited States
CitySan Francisco


  • PDT dose
  • Photofrin
  • photodynamic therapy
  • pleural PDT


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