Real-time, in vivo measurement of tissular pO2 through the delayed fluorescence of endogenous protoporphyrin IX during photodynamic therapy

Filippo M. Piffaretti; Anna Maria Novello; Rajendran Senthil Kumar; Eddy Forte; Cédric Paulou; Patrycja M. Nowak-Sliwinska; Hubert E. van den Bergh; Georges A. Wagnières

doi:10.1117/1.JBO.17.11.115007

9 November 2012 Real-time, in vivo measurement of tissular pO2 through the delayed fluorescence of endogenous protoporphyrin IX during photodynamic therapy

Filippo M. Piffaretti, Anna Maria Novello, Rajendran Senthil Kumar, Eddy Forte, Cédric Paulou, Patrycja M. Nowak-Sliwinska, Hubert E. van den Bergh, Georges A. Wagnières

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Journal of Biomedical Optics, Vol. 17, Issue 11, 115007 (November 2012). https://doi.org/10.1117/1.JBO.17.11.115007

Abstract

Tissular oxygen concentration plays a key role during photodynamic therapy (PDT). Therefore, monitoring its local oxygen partial pressure (pO₂) may help predict and/or control the outcome of a PDT treatment. The first real-time, in vivo measurements of the pO₂ in the chicken egg's chorioallantoic membrane, using the delayed fluorescence of photoactivable porphyrins (PAPs), including protoporphyrin IX (PpIX), as monitored with a dedicated optical, fiber-based, time-resolved spectrometer, are reported here. The formation of PAPs/PpIX, photosensitizers of extensive clinical use, was induced in the chicken egg's chorioallantoic membrane (CAM) with aminolevulinic acid. An excellent correlation between the vascular damage induced by PDT and the reduction in tissular pO₂ is found. This study suggests that clinical measurement of the pO₂ using the PAPs'/PpIX's delayed fluorescence (DF) may be used to individualize in real time the PDT light dose applied.

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Filippo M. Piffaretti, Anna Maria Novello, Rajendran Senthil Kumar, Eddy Forte, Cédric Paulou, Patrycja M. Nowak-Sliwinska, Hubert E. van den Bergh, and Georges A. Wagnières "Real-time, in vivo measurement of tissular pO2 through the delayed fluorescence of endogenous protoporphyrin IX during photodynamic therapy," Journal of Biomedical Optics 17(11), 115007 (9 November 2012). https://doi.org/10.1117/1.JBO.17.11.115007

Published: 9 November 2012

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