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Proceedings Paper

FEM modeling and histological analyses on thermal damage induced in facial skin resurfacing procedure with different CO2 laser pulse duration
Author(s): Francesca Rossi; Tiziano Zingoni; Emiliano Di Cicco; Leonardo Manetti; Roberto Pini; Damiano Fortuna
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Paper Abstract

Laser light is nowadays routinely used in the aesthetic treatments of facial skin, such as in laser rejuvenation, scar removal etc. The induced thermal damage may be varied by setting different laser parameters, in order to obtain a particular aesthetic result. In this work, it is proposed a theoretical study on the induced thermal damage in the deep tissue, by considering different laser pulse duration. The study is based on the Finite Element Method (FEM): a bidimensional model of the facial skin is depicted in axial symmetry, considering the different skin structures and their different optical and thermal parameters; the conversion of laser light into thermal energy is modeled by the bio-heat equation. The light source is a CO2 laser, with different pulse durations. The model enabled to study the thermal damage induced into the skin, by calculating the Arrhenius integral. The post-processing results enabled to study in space and time the temperature dynamics induced in the facial skin, to study the eventual cumulative effects of subsequent laser pulses and to optimize the procedure for applications in dermatological surgery. The calculated data where then validated in an experimental measurement session, performed in a sheep animal model. Histological analyses were performed on the treated tissues, evidencing the spatial distribution and the entity of the thermal damage in the collageneous tissue. Modeling and experimental results were in good agreement, and they were used to design a new optimized laser based skin resurfacing procedure.

Paper Details

Date Published: 2 June 2011
PDF: 5 pages
Proc. SPIE 8092, Medical Laser Applications and Laser-Tissue Interactions V, 80921Q (2 June 2011); doi: 10.1117/12.889932
Show Author Affiliations
Francesca Rossi, Institute of Applied Physics Nello Carrara, CNR (Italy)
Tiziano Zingoni, PhotoBiolab Unit, El.En. Group (Italy)
Emiliano Di Cicco, PhotoBiolab Unit, El.En. Group (Italy)
Leonardo Manetti, PhotoBiolab Unit, El.En. Group (Italy)
Roberto Pini, Institute of Applied Physics Nello Carrara, CNR (Italy)
Damiano Fortuna, PhotoBiolab Unit, El.En. Group (Italy)

Published in SPIE Proceedings Vol. 8092:
Medical Laser Applications and Laser-Tissue Interactions V
Ronald Sroka; Lothar D. Lilge, Editor(s)

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