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We study a mathematical model for laser-induced thermotherapy,
a minimally invasive cancer treatment. The model consists of a
diffusion approximation of the radiation transport equation
coupled to a bio-heat equation and a model to describe the
evolution of the coagulated zone. Special emphasis is laid on
a refined model of the applicator device, accounting for the
effect of coolant flow inside. Comparisons between experiment
and simulations show that the model is able to predict the
experimentally achieved temperatures reasonably well.