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12 February 2018 Improvement of the light-tissue coupling for better outcome of phototherapies
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Phototherapies have been increasingly used in several applications such as the control of pain and inflammatory processes, photodynamic therapy, and even aesthetics uses. After many decades, the dosimetry for those techniques remains challenging. One of the key issues is the lack of homogeneity obtained for tissue illumination, which may limit adequate treatment. Especially concerning lesions, the surface tissue is usually irregular, and the light does not couple to the tissue efficiently to promote an effective treatment. A series of experiments have been performed using optical phantoms, in which coupling was improved by introducing a gel with a low concentration of scattering agents between the fiber and the phantom as an attempt to improve the homogeneity of light distribution within the phantoms. The effects promoted by roughness on phantom tissue surfaces are considerably attenuated when the coupling gel was introduced, resulting in a more uniform illumination pattern that may be used to promote better phototherapy treatments outcome.
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Dilleys Ferreira da Silva, José Dirceu Vollet Filho II, Thereza Cury Fortunato, Lilian Tan Moriyama, Clovis Grecco, Sebastião Pratavieira, Cristina Kurachi, and Vanderlei Salvador Bagnato "Improvement of the light-tissue coupling for better outcome of phototherapies", Proc. SPIE 10476, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXVII, 1047614 (12 February 2018);

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