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Propagation of light in human artery irradiated by surface sources at a wavelength of 633 nm

Monte Carlo method is used to simulate light distribution in human artery of three layers that is irradiated respectively by two different surface photon sources (Guassian beam and flat beam) of 0.06cm radii at wavelength of 633nm. Fluence, diffuse reflectance and diffuse transmission distribution of the tissue are given when the two surface photon sources illuminate the tissue respectively. The influence of the shape of the incident beam on the above parameters, and that of the refractive index n on the diffuse reflectance Rd and absorptance A of the tissue, are discussed. The obtained results are: the diffuse reflectance Rd and fluence Φ are mainly distributed in radial scale of the size of the incident beam, and the influence of the shape of the incidence beam on the radial distribution of Rd and Φ is also in the scale of the size of the incident beam, whereas that of the shape of the incident light beam on the diffuse transmission is little. Rd is linearly decreased with the increasing of n in each layer tissue, but the influence of n in deeper layer tissue on Rd is little; absorptance is linearly increased with the increasing of n in each layer tissue. Therefore, the refractive index is a very important parameter in biotissue.