Clinical feasibility of monitoring m-THPC mediated photodynamic therapy by means of fluorescence differential path-length spectroscopy

B Karakullukcu, Chad Kanick, JB Aans, Dick Sterenborg, IB Tan, Arjen Amelink, Dominic Robinson

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11 Citations (Scopus)


The objective quantitative monitoring of light, oxygen, and photosensitizer is challenging in clinical photodynamic therapy settings. We have previously developed fluorescence differential path-length spectroscopy (FDPS), a technique that utilizes reflectance spectroscopy to monitor microvascular oxygen saturation, blood volume fraction, and vessel diameter, and fluorescence spectroscopy to monitor photosensitizer concentration. In this paper the clinical feasibility of the technique is tested on eight healthy volunteers and on three patients undergoing PDT of oral cavity cancers. Model-based analysis of the measured spectra provide quantitative tissue parameters that are corrected for background tissue absorption, autofluorescence, and the transmission of the optical system; this method allows comparison of intra-and intersubject parameters. The FDPS correctly estimated the absence of m-THPC in volunteers and detected photo-bleaching in the areas receiving treatment light in patients undergoing PDT treatment. This study demonstrates the feasibility of monitoring clinical photodynamic therapy treatments using optical spectroscopy. [GRAPHICS] Schematic of the fluorescence differential path-length spectroscopy device setup.
Original languageUndefined/Unknown
Pages (from-to)740-751
Number of pages12
JournalJournal of Biophotonics
Issue number10
Publication statusPublished - 2011

Research programs

  • EMC MM-03-32-09

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