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Proceedings Paper

On-off time control of laser pulses for pseudo-constant temperature coagulation in tissue
Author(s): Gilwon Yoon; Serge R. Mordon; Jean Marc Brunetaud; Radouan Faiz; Richard C. Straight; Pierre Yves Bugnon; Marcel Staroswiecki; J. Leroux
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Paper Abstract

An open-loop temperature control was introduced to control evolution of the maximum temperature on the tissue surface to be within upper and lower limits. For this purpose, the temperature evolutions of sample shots were analyzed and optimal sequences of laser pulses were computed. The 1.06 tm pulsed Nd:YAG laser was used and the thermal camera measured temperature. Experiment on animals in vivo and in vitro was performed to test the technique. Upper and lower temperature limits during laser irradiation were set below 100 °C since thermal coagulation was ofprimary concern. Usually, difference between the upper and lower limits was set to 1 5°C during experiment. However, this difference depended on the laser specifications such as power, pulse width, and repetition rates, as well as on tissue properties. Coagulation studies showed a clear relation of temperature versus cogulation depth. Therefore, the heating temperature and the duration time can be used as primary parameters instead of laser power and exposure time or energy.

Paper Details

Date Published: 1 June 1990
PDF: 10 pages
Proc. SPIE 1202, Laser-Tissue Interaction, (1 June 1990); doi: 10.1117/12.17632
Show Author Affiliations
Gilwon Yoon, Univ. of Utah and INSERM (France)
Serge R. Mordon, INSERM (France)
Jean Marc Brunetaud, INSERM and Central Hospital (France)
Radouan Faiz, INSERM and Univ. of Science and Technique (France)
Richard C. Straight, Univ. of Utah (United States)
Pierre Yves Bugnon, Univ. of Science and Technique (France)
Marcel Staroswiecki, Central Hospital (France)
J. Leroux, Micro-Controle (France)

Published in SPIE Proceedings Vol. 1202:
Laser-Tissue Interaction
Steven L. Jacques, Editor(s)

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