Abstract
The local absorption of laser light generates heat that is conducted to cooler regions of the tissue. The rate of heat generation at a point r is equal to the fluence rate at r times the local absorption coefficient μa (r)(m−1). When light scattering dominates absorption, a solution to the transport equation is necessary to compute the fluence rate Φ(r) (W/m2). Typically, 3-D diffusion approximation or Monte Carlo models are employed to describe the propagation of light in tissue. Once the rate of heat generation S(r) (W/m3) has been determined, the transient temperature field is computed using a numerical solution of the heat conduction equation. The extent of thermal damage (coagulation) is estimated with a temperature-time-dependent rate process equation. These linear models provide reasonable predictions of the thermal response of laser irradiated tissue when the optical, thermal, and rate coefficients of the tissue are known.
© 1990 Optical Society of America
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