Study of Light Propagation in Biological Tissues by Means of the Monte Carlo Simulation and Diffusion Method

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Afsari Golshan, Maryam | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42094 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Amjadi, Ahmad; Ansari, Mohammad Ali
Abstract:
The tissue characteristics are important for all kinds of medical laser applications in order to understand the interaction mechanisms between light and tissue. Knowledge about light transport in tissue is essential for cancer treatment and cancer diagnostic techniques. By having the diffused reflectance of a tissue we can determine its optical characteristics. In this thesis we have solved the inverse process. That is, we compute the diffused reflectance of a turbid media with pre-determined optical parameters. This problem can be solved using two methods: Monte Carlo simulation and diffusion method. Since Monte Carlo simulation is computationally very expensive, it is not used in medical imaging. Although diffusion theories offer a fast approach to approximating certain physical quantities of light transport in turbid media, they are not valid near the source or the boundary. Hybrid of Monte Carlo simulation and diffusion theory combines the accuracy of Monte Carlo simulation near the source and the speed of diffusion theory distant from the source.
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Keywords:
Monte Carlo Method ; Diffusion ; Turbid Media

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