Premium
Clinical feasibility of monitoring m‐THPC mediated photodynamic therapy by means of fluorescence differential path‐length spectroscopy
Author(s) -
Karakullukcu Baris,
Kanick Stephen Chad,
Aans Jan Bonne,
Sterenborg Henricus JCM,
Tan I. Bing,
Amelink Arjen,
Robinson Dominic J.
Publication year - 2011
Publication title -
journal of biophotonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 66
eISSN - 1864-0648
pISSN - 1864-063X
DOI - 10.1002/jbio.201100051
Subject(s) - photodynamic therapy , photosensitizer , photobleaching , autofluorescence , fluorescence spectroscopy , spectroscopy , fluorescence , chemistry , biomedical engineering , photochemistry , optics , medicine , physics , organic chemistry , quantum mechanics
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 inter‐subject parameters. The FDPS correctly estimated the absence of m ‐THPC in volunteers and detected photobleaching 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. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)