Dose control for noncontact laser coagulation of tissue

Andre Roggan; Hansjoerg Albrecht; Thomas Bocher; Reiner Rygiel; Harald Winter; Gerhard J. Mueller

doi:10.1117/12.199182

18 January 1995 Dose control for noncontact laser coagulation of tissue

Andre Roggan, Hansjoerg Albrecht, Thomas Bocher, Reiner Rygiel, Harald Winter, Gerhard J. Mueller

Proceedings Volume 2323, Laser Interaction with Hard and Soft Tissue II; (1995) https://doi.org/10.1117/12.199182
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

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.

Citation Download Citation

Andre Roggan, Hansjoerg Albrecht, Thomas Bocher, Reiner Rygiel, Harald Winter, and Gerhard J. Mueller "Dose control for noncontact laser coagulation of tissue", Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); https://doi.org/10.1117/12.199182

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