Pulsed photothermal radiometry in investigation of tissue destruction caused by CO2 laser action

Galina P. Chebotareva; Boris V. Zubov; Alexander P. Nikitin; Anatolii P. Rakcheev; Larisa R. Alexeeva

doi:10.1117/12.197561

23 December 1994 Pulsed photothermal radiometry in investigation of tissue destruction caused by CO₂ laser action

Galina P. Chebotareva, Boris V. Zubov, Alexander P. Nikitin, Anatolii P. Rakcheev, Larisa R. Alexeeva

Proceedings Volume 2327, Medical Applications of Lasers II; (1994) https://doi.org/10.1117/12.197561
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

Pulsed photothermal radiometry (PPTR) of tissue based on the analysis of thermal radiation kinetics measured from tissue at laser heating is an effective method of laser-tissue interaction investigation. The processes of destruction under laser radiation action (coagulation, fusion and welding), which are characterized by definite dynamics of temperature in the region of laser heating, have been studied. The amplitude and kinetics of the thermal signal registered by PPTR technique depend on space and temporal temperature changes in the zone of heating, which is conditioned by the regime of laser action and internal processes in tissue. In the present study the investigation of thermal tissue destruction under action of high-power pulsed CO₂ and YAG:Er-laser radiation has been carried out using PPTR. Soft and hard tissues have been examined. The nonlinear dependencies of thermal emission kinetics, the thermal signal amplitude, and the integral absorption on laser energy density are presented and discussed. We represent PPTR as a technique which can be used for the definition of the destruction threshold and for the regulation of laser action on tissue. PPTR method has been applied in clinics with the aim of more accurate definition of CO₂ pulsed medical laser radiation dose for treatment of patients with different dermatological diseases.

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Galina P. Chebotareva, Boris V. Zubov, Alexander P. Nikitin, Anatolii P. Rakcheev, and Larisa R. Alexeeva "Pulsed photothermal radiometry in investigation of tissue destruction caused by CO₂ laser action", Proc. SPIE 2327, Medical Applications of Lasers II, (23 December 1994); https://doi.org/10.1117/12.197561

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KEYWORDS

Carbon dioxide lasers

Laser tissue interaction

Tissues

Erbium

Laser applications

Radiometry

Laser energy

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