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Proceedings Paper

Characterization of tissuelike media using the photoacoustic method
Author(s): Stefan Lohmann; Michael Zacher; Christoph H. Schmitz; Holger Lubatschowski; Wolfgang Ertmer
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Paper Abstract

These studies are directed towards an on-line monitoring of tissue optical properties during medical laser diagnostics and therapy. The method of detection is based upon photoacoustic measurements. The detection of the laser induced acoustic transients was realized by means of piezoelectric transducers. Results concerning the optical properties of layered tissue- like samples are presented for two experimental configurations, i.e. transmission mode and reflection mode. The corresponding transients are calculated analytically and account for different influences which contribute to the signal, such as the laser parameters. Especially the effect of optoacoustic diffraction was investigated experimentally and verified theoretically. Its influence could be eliminated by applying fitting functions to the detected transients which take into account the distorting effect of diffraction.

Paper Details

Date Published: 14 January 1998
PDF: 9 pages
Proc. SPIE 3195, Laser-Tissue Interaction, Tissue Optics, and Laser Welding III, (14 January 1998); doi: 10.1117/12.297880
Show Author Affiliations
Stefan Lohmann, Univ. Hannover (FRG) and Laser Zentrum Hannover eV (Germany)
Michael Zacher, Univ. Hannover (Germany)
Christoph H. Schmitz, Univ. Hannover (Germany)
Holger Lubatschowski, Univ. Hannover (FRG) and Laser Zentrum Hannover eV (Germany)
Wolfgang Ertmer, Univ. Hannover (Germany)


Published in SPIE Proceedings Vol. 3195:
Laser-Tissue Interaction, Tissue Optics, and Laser Welding III
Guy P. Delacretaz; Guilhem Godlewski M.D.; Roberto Pini; Rudolf W. Steiner; Lars Othar Svaasand, Editor(s)

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