Three-dimensional FTn Finite Volume Analysis of Short Pulse Laser Propagation through Biomedical Tissue Phantoms

摘要

In this paper,a three-dimensional biomedical tissue phantom subjected to a short-pulse laser has been studied.The FTn Finite Volume Method has been applied to solve the transient radiative transfer equation for isotropic and anisotropic tissue phantom.Both Curved-Line Advection Method(CLAM)and STEP schemes have been investigated.The transmittance and reflectance radiative signals have been analysed.The present predictions are confirmed by comparison with the solutions of the Monte Carlo method.The CLAM predictions proved that a decrease of the false scattering and ray effects are obtained and a good agreement with the reference solutions has been achieved.However,the STEP results are slight mismatching the solutions of the reference method.Then,the effects of the optical thickness,the albedo,and the asymmetry factor of the tissue phantom on the radiative signals have been examined.The results proved that a decrease of the peak transmittance is obtained when the optical thickness or the asymmetry factor of the tissue increases.However,this peak increases when the albedo increases.