离体猪鼻咽组织的光学特性参数测量

Determination of Optical Properties of Porcine Nasopharyngeal Tissue in Vitro with Integrating Sphere Technique

利用单积分球技术测定了在He Ne激光照射下离体猪鼻咽组织的反射率和透射率以及准直透射率 ,并应用反向倍加 (IAD)方法间接获得了猪鼻咽组织的光学特性参数。结果表明 ,猪鼻咽组织具有低吸收和强前向散射的特性 ,其吸收系数和散射系数分别为 0 96cm-1和 6 2 7cm-1,散射异向因子为 0 92 ,光学穿透深度为 0 2 4 1cm。这些参数为模拟计算光能流率在人体鼻咽组织中的分布提供了理论数据。

Measurements of total reflectance and transmittance for porcine nasopharyngeal tissue using single integrating sphere technique were carried out under the irradiation of He Ne laser at the wavelength of 632 8 nm, which has the advantage over conventional double sphere techniques in that no corrections are required for sphere properties. Furthermore, with the measurement of collimated transmission for optically thin slabs, the optical properties of porcine nasopharyngeal tissue in vitro were indirectly obtained by applying inverse adding doubling theoretical model. The optical properties of porcine nasopharyngeal tissue are characterized by low absorption and high scatter, and the value for absorption coefficient and scattering coefficient are 0 96 cm -1 and 62 7 cm -1 , respectively. The scattered light is highly forward as demonstrated by the mean cosine of the scattering angle, and the optical penetration depth for porcine nasopharyngeal tissue is about 0 241 cm.