MODELING OF ND-YAG LASER ABSORPTIONAND HEAT DISTRIBUTION IN TISSUE BY MONTE CARLO TECHNIQUE

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ALINAGHIZADEH M.R.; SARKAR S.; MIRAN BEYGI M.H.

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2003 | Volume:1 | Issue:1 Page(s): 25-29

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Information Journal Paper

Title

MODELING OF ND-YAG LASER ABSORPTIONAND HEAT DISTRIBUTION IN TISSUE BY MONTE CARLO TECHNIQUE

Author(s)

ALINAGHIZADEH M.R. | SARKAR S. | MIRAN BEYGI M.H. | Issue Writer Certificate

Keywords

MONTE CARLOQ3

ND-YAG LASERQ4

FINITE DIFFERENCE METHODQ4

Abstract

The purpose of our research was to deliver the maximum heat needed to destroy the tumoral tissue while minimizing the heat damage to the normal tissue. Modeling of laser absorption is the most important parameter in laser therapy treatment planning. Some models of laser absorption have been proposed and are currently in use. In this paper we propose a simulation method based on MONTE CARLO code and evaluate the results of this simulation with experimental data. For modeling the laser absorption and finding the matrix of energy absorption in tissue MONTE CARLO method (MCML cod) was used. The heat transfer in tissue was modeled by FINITE DIFFERENCE METHOD by which the temperatures of each point in different time were calculated. For this modeling we used Delphi programming language. The difference between simulation and experimental results in the power range of 0.25-1W/mm2 and 1-3 W/mm2 was 5% and 10% respectively. In the simulation 90% of energy was absorbed in the first cm of liver depth. For I watt laser beam with waist of 1, 2 and 4 mm the maximum energy absorbed by tissue were 15,6 and 1.5 j/cm3 respectively. For optimizing the treatment by lasers, verification of beam and tissue parameters are essential and use of MONTE CARLO method as a powerful tool is suggested.

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