DOI: 10.5176/2251-2489_ BioTech14.42
Authors: Yin Chang, Suei-Ting Chao
Abstract: The study was to quantify the absorption and the back scattering pattern of porcine tissues including ligamentum flavum, muscle and adipose which were irradiated by red (650nm) and green (532nm) lasers in various angles. The back scattering image of the tissue was captured by a CCD camera. The optical parameters such as diffusion coefficient (D), effective attenuation coefficient (eff), absorption coefficient (a) and effective scattering coefficient (’s) of tissues are obtained from the images by using non-linear curve fitting. The purpose of this study is to help us in the design of a particular hollow puncture needle which is embedded with optical fibers and will be used for epidural space detection in regional anesthesia. The results showed that the absorption coefficient of muscle and adipose increased with the increment of the light incident angle. On the contrary, the effective scattering coefficient of the same tissues decreased with the increment of the light incident angle. Additionally, there’s almost no noticeable change for the ligamentum flavum while measured under the same conditions.
Keywords: absorption; scattering, tissue; epidural space
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