Physical and mathematical models of the heat action of laser radiation on biotissues

Andrei V. Ivanov; E. I. Molodykh; Yury M. Romanovsky; T. A. Schetinkina; D. V. Borisov

doi:10.1117/12.197482

2 January 1995 Physical and mathematical models of the heat action of laser radiation on biotissues

Andrei V. Ivanov, E. I. Molodykh, Yury M. Romanovsky, T. A. Schetinkina, D. V. Borisov

Proceedings Volume 2370, 5th International Conference on Laser Applications in Life Sciences; (1995) https://doi.org/10.1117/12.197482
Event: Laser Applications in Life Sciences: 5th International Conference, 1994, Minsk, Belarus

Abstract

A mathematical model of contact laser destruction of normal and tumor liver tissues by radiation of YAG:Nd laser is described. We present the results of the simulation of tissue heat destruction, taking into account the influence of blood and lymph circulation on the processes of heat transfer. The problem is adapted to the case of liver tissue with tumor. A liver is considered as a capillary-porous body with internal blood circulation. Heatconductivity and tissue-blood heat transfer are considered. Heat action is assumed to be implemented with contact laser scalpel. The mathematical model consists of two inhomogeneous nonlinear equations of heatconductivity with spherical symmetry. Nonstationary temperature fields of tissue and blood are determined. The power of laser radiation (LR) was taken into account in boundary conditions set for the center of coagulated tissue volume. We also took into account the processes connected with changing of substance phase (vaporization). The original computer programs allow one to solve the problem varying in a wide range of the main parameters. Reasonable agreement was found between the calculation results and the experimental data for operations on macrosamples and on test animals.

Citation Download Citation

Andrei V. Ivanov, E. I. Molodykh, Yury M. Romanovsky, T. A. Schetinkina, and D. V. Borisov "Physical and mathematical models of the heat action of laser radiation on biotissues", Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); https://doi.org/10.1117/12.197482

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