18 August 1997 Measurements of time-resolved transmittances through cylindrical solid phantoms: comparison with 2D and 3D FEM simulations
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Abstract
Experimentally acquired time-resolved and continuous-wave diffuse transmittances of near-infrared light through cylindrical solid phantoms are presented. Homogeneous and inhomogeneous tissue-like phantoms (68 mm diameter, epoxy resin) were used. The transmittances were acquired at 18 degree intervals around the phantoms. Experimental results are compared with results of two dimensional and three dimensional finite-element simulations. The influence of absorbing boundaries on the shape of time-resolved and continuous-wave transmittances has been investigated for slab and cylindrical geometry. Analytical solutions of the photon diffusion equation with reflecting and absorbing boundary conditions were applied to estimate the optical properties of the material. A new index, time-resolved homogeneity index, is introduced for quick and simple inhomogeneity detection prior to image reconstruction.
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Sergei G. Proskurin, Shuichi Takahashi, Ivo W. Kwee, Yukari Tanikawa, Yukio Yamada, "Measurements of time-resolved transmittances through cylindrical solid phantoms: comparison with 2D and 3D FEM simulations", Proc. SPIE 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II, (18 August 1997); doi: 10.1117/12.280253; https://doi.org/10.1117/12.280253
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