人血管对He-Ne激光的吸收系数和散射相函数的研究

运用光生物学、基础医学以及物理学的基本理论,探讨了人血管组织的激光传播特性,定量测定了人血管组织的激光传输参量。采用标准积分球测量了人血管组织样品在632.8nmHeNe激光照射下的透射比T和反射比R,推算吸收比A。并把分光仪改装为光散射测量装置,测量了632.8nmHeNe激光照射下,-90°～90°散射角范围内的散射相函数S(θ),计算散射余弦平均值μ。结果表明:人血管组织受小功率(P=20mW)632.8nmHeNe激光照射时,光强衰减符合指数衰减规律,人血管组织对激光有较弱的前向散射。

Transmittance absorption coefficients and scattering phase functions of human artery and vein for He-Ne laser

The paper present an investigation on the characteristic of laser light transporting in human artery and vein with the aid of the primary theories of photo-biology,elementary medical science and physics. Diffuse reflectance R and transmittance T of human artery and vein samples is measured by a standard integrating spheres system,using He-Ne laser in 632.8nm wavelength and the absorbance A was deduced. The scattering phase function S(θ) is obtained by the experimental arrangement repacked from a spectroscope at angles from -90°to 90°for human artery and vein samples in 632.8nm wavelength and the mean cosines of scatter μ was calculated. The results show that the attenuation of the transmitted light intensity with sample thickness satisfy exponential attenuation by low power(P<20mW) laser radiation for human artery and vein and scattering of light in human artery and vein is highly converse peaked.