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Proceedings Paper

Acoustic online monitoring of IR laser ablation of burnt skin
Author(s): Kester Nahen; Werner Eisenbeiss; Alfred Vogel
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Paper Abstract

In burn surgery necrotic tissue has to be removed prior to skin grafting. Tangential excision causes high blood loss and destruction of viable tissue. Pulsed IR laser ablation can overcome these problems because of its high precision and the superficial coagulation of the remaining tissue. We realized an acoustic on-line monitoring system for a selective removal of necrotic tissue that is based on the detection of the energy of the acoustic signal produced during ablation. We developed a PC based system for data acquisition and real-time data analysis running at laser repetition rates of more than 30 Hz, and studied free- running Er:YAG laser ablation of burned skin and stacked gelatin samples which served as reproducible tissue models. Spectral analysis of the ablation noise showed that the optimum tissue specificity of the acoustic energy can only be achieved if the bandwidth of the acoustic transducer range up to more than 300 kHz. We were able to detect the boundary between gelatin layers of different water content by applying a threshold criterion for the relative increase of the acoustic energy with respect to the first laser pulse at each ablation site. Healthy and burned parts of skin samples as well as necrotic and viable tissue layers in second degree burns could be discriminated, in agreement with the result of histologic examinations. Superficial vascular structures could be distinguished fro surrounding burned tissue with good spatial resolution.

Paper Details

Date Published: 19 May 2000
PDF: 9 pages
Proc. SPIE 3916, Biomedical Optoacoustics, (19 May 2000); doi: 10.1117/12.386325
Show Author Affiliations
Kester Nahen, Medical Laser Ctr. Luebeck GmbH (United States)
Werner Eisenbeiss, Medical Univ. of Luebeck (Germany)
Alfred Vogel, Medical Laser Ctr. Luebeck GmbH (Germany)

Published in SPIE Proceedings Vol. 3916:
Biomedical Optoacoustics
Alexander A. Oraevsky, Editor(s)

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