Dr. Cristiane Miranda França Profile

Dr. Cristiane Miranda França

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Proceedings Article | 5 March 2015 Paper

Optical properties of mice skin for optical therapy relevant wavelengths: influence of gender and pigmentation

C. Sabino, A. Deana, D. Silva, C. França, T. Yoshimura, M. Ribeiro

Proceedings Volume 9309, 93090D (2015) https://doi.org/10.1117/12.2080853

KEYWORDS: Skin, Tissue optics, Optical properties, Tissues, Transmittance, Scattering, Light scattering, Statistical analysis, Absorption, Reflectivity

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Red and near-infrared light have been widely employed in optical therapies. Skin is the most common optical barrier in non-invasive techniques and in many cases it is the target tissue itself. Consequently, to optimize the outcomes brought by lightbased therapies, the optical properties of skin tissue must be very well elucidated. In the present study, we evaluated the dorsal skin optical properties of albino (BALB/c) and pigmented (C57BL/6) mice using the Kubelka-Munk photon transport model. We evaluated samples from male and female young mice of both strains. Analysis was performed for wavelengths at 630, 660, 780, 810 and 905 nm due to their prevalent use in optical therapies, such as low-level light (or laser) and photodynamic therapies. Spectrophotometric measurements of diffuse transmittance and reflectance were performed using a single integrating sphere coupled to a proper spectrophotometer. Statistic analysis was made by two-way ANOVA, with Tukey as post-test and Levenne and Shapiro-Wilks as pre-tests. Statistical significance was considered when p<0.05. Our results show only a slight transmittance increment (<10 %) as wavelengths are increased from 630 to 905 nm, and no statistical significance was observed. Albino male mice present reduced transmittance levels for all wavelengths. The organization and abundance of skin composing tissues significantly influence its scattering optical properties although absorption remains constant. We conclude that factors such as subcutaneous adiposity and connective tissue structure can have statistically significant influence on mice skin optical properties and these factors have relevant variations among different gender and strains.

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