Free-boundary model for local thermal coagulation

Igor A. Lubashevsky; Alexander V. Priezzhev; Vasyl V. Gafiychuk; Meruzhan G. Cadjan

doi:10.1117/12.239559

7 May 1996 Free-boundary model for local thermal coagulation

Igor A. Lubashevsky, Alexander V. Priezzhev, Vasyl V. Gafiychuk, Meruzhan G. Cadjan

Proceedings Volume 2681, Laser-Tissue Interaction VII; (1996) https://doi.org/10.1117/12.239559
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We propose a new mathematical model for the growth of a necrosis domain due to thermal coagulation. We assume that laser light is locally delivered to a small internal region where laser energy absorption causes the temperature to attain high values leading to immediate tissue coagulation. Heat diffusion into the surrounding tissue causes its further thermal coagulation, giving rise to the growth of the necrosis domain. The coagulation is treated in terms of irreversible phase transition, i.e. the coagulation is assumed to occur after the tissue temperature exceeds a certain threshold value T_cg. Two alternative models, the developed one and the model previously used are compared. The effects of the blood flow nonuniformity, the tissue response to temperature variations, and the delay of this response are analyzed in detail.

Citation Download Citation

Igor A. Lubashevsky, Alexander V. Priezzhev, Vasyl V. Gafiychuk, and Meruzhan G. Cadjan "Free-boundary model for local thermal coagulation", Proc. SPIE 2681, Laser-Tissue Interaction VII, (7 May 1996); https://doi.org/10.1117/12.239559

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