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Proceedings Paper

Comparison of two photosensitizers in photodynamic therapy using light pulses in femtosecond regime: an animal study
Author(s): Clóvis Grecco; Sebastião Pratavieira; Vanderlei Bagnato; Cristina Kurachi
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Paper Abstract

Photodynamic therapy is a therapeutic modality for cancer treatment based on the interaction of light with a sensitizer agent and molecular oxygen present into the target cells. The aim of this study is the evaluation of photodynamic therapy using pulsed light source in the femtosecond regime through necrosis induced in healthy rat liver. The induced necrosis profile with CW laser and pulsed laser were evaluated in animal model, which received Photodithazine (chlorine e6 derivative). The light sources used in these studies were a 660 nm CW diode laser and a Ti:Sapphire Regenerative Amplifier laser (1 kHz repetition rate and 100 fs pulse width) associated with an optical parametric amplifier (OPA) to convert to 660 nm. The results were compared with a previous study when was used a hematoporphyrin derivative (Photogem) as a sensitizer. The induced necrosis with Photogen was greater with pulsed laser (2.0 ± 0.2 mm) in comparison with CW laser (1.0 ± 0.2 mm), while in Photodithazine the induced necrosis with was greater with CW laser (2.9 ± 0.2 mm) comparing the pulsed laser (2.0 ± 0.2 mm). These results indicate dependence of PDT mechanisms with photosensitizer and the light regime applied.

Paper Details

Date Published: 1 March 2016
PDF: 8 pages
Proc. SPIE 9694, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXV, 969417 (1 March 2016); doi: 10.1117/12.2211140
Show Author Affiliations
Clóvis Grecco, Univ. of São Paulo (Brazil)
Sebastião Pratavieira, Univ. of São Paulo (Brazil)
Vanderlei Bagnato, Univ. of São Paulo (Brazil)
Cristina Kurachi, Univ. of São Paulo (Brazil)

Published in SPIE Proceedings Vol. 9694:
Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXV
David H. Kessel; Tayyaba Hasan, Editor(s)

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