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Proceedings Paper

Dose control for noncontact laser coagulation of tissue
Author(s): Andre Roggan; Hansjoerg Albrecht; Thomas Bocher; Reiner Rygiel; Harald Winter; Gerhard J. Mueller
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Paper Abstract

Nd:YAG lasers emitting at 1064 nm are often used for coagulation of tissue in a non-contact mode, i.e. the treatment of verrucae, endometriosis, tumor coagulation and hemostasis. During this process an uncontrolled temperature rise of the irradiated area leads to vaporization and, finally, to a carbonization of the tissue surface. To prevent this, a dose controlled system was developed using an on-line regulation of the output laser power. The change of the backscattered intensity (remission) of the primary beam was used as a dose dependent feedback parameter. Its dependence on the temperature was determined with a double integrating sphere system and Monte-Carlo simulations. The remission of the tissue was calculated in slab geometry from diffusion theory and Monte-Carlo simulations. The laser control was realized with a PD-circuit and an A/D-converter, enabling the direct connection to the internal bus of the laser system. Preliminary studies with various tissues revealed the practicability of the system.

Paper Details

Date Published: 18 January 1995
PDF: 10 pages
Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); doi: 10.1117/12.199182
Show Author Affiliations
Andre Roggan, Laser-Medizin-Zentrum GmbH (Germany)
Hansjoerg Albrecht, Laser-Medizin-Zentrum GmbH (Germany)
Thomas Bocher, Laser-Medizin-Zentrum GmbH (Germany)
Reiner Rygiel, Laser-Medizin-Zentrum GmbH (Germany)
Harald Winter, Laser-Medizin-Zentrum GmbH (Germany)
Gerhard J. Mueller, Laser-Medizin-Zentrum GmbH (Germany)


Published in SPIE Proceedings Vol. 2323:
Laser Interaction with Hard and Soft Tissue II
Hans Joerg Albrecht; Guy P. Delacretaz; Thomas H. Meier; Rudolf W. Steiner; Lars Othar Svaasand; Martin J. C. van Gemert, Editor(s)

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