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Proceedings Paper

Free boundary model for local thermal coagulation: growth of a spherical and cylindrical necrosis domain
Author(s): Igor A. Lubashevsky; Alexander V. Priezzhev; Vasyl V. Gafiychuk
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Paper Abstract

In the present paper basing ont he free boundary model proposed previously we analyze the characteristic properties of local thermal coagulation depending on the applicator form. This model assumes that direct absorption of laser light in a small region causes the temperature to attain sufficiently high values leading to the immediate tissue coagulation. Heat diffusion into the surrounding live tissue gives rise to further thermal coagulation and the subsequent growth of the necrosis domain. Keeping in mind the possible forms of applicators we study the necrosis growth considering the heat generation rate of the cylindrical and spherical symmetry. In particular, it is shown that for the 3D case the necrosis growth exhibits saturation when thermal coagulation is limited by heat diffusion. For the 2D case heat diffusion provides continuous growth of the necrosis domain during the whole time of thermotherapy treatment. It turns out that the time dependence of the temperature in the region where thermal coagulation is under way is practically insensitive to particular details of the growth conditions.

Paper Details

Date Published: 16 June 1997
PDF: 11 pages
Proc. SPIE 2975, Laser-Tissue Interaction VIII, (16 June 1997); doi: 10.1117/12.275501
Show Author Affiliations
Igor A. Lubashevsky, Moscow State Univ. (Russia)
Alexander V. Priezzhev, Moscow State Univ. (Russia)
Vasyl V. Gafiychuk, Moscow State Univ. (Ukraine)


Published in SPIE Proceedings Vol. 2975:
Laser-Tissue Interaction VIII
Steven L. Jacques, Editor(s)

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