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Proceedings Paper

Plasma-mediated ablation of brain tissue in liquid media and application in stereotactic laser neurosurgery
Author(s): Marcus H. Goetz; Stefan K. Fischer; Burkhard A. Groh; Michael H. Ott; Stefan Goelz; Josef F. Bille
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Paper Abstract

The application of focused picosecond laser pulses in stereotactic neurosurgery requires the knowledge of ablation efficiency and quality in consideration of clinical practice. In neurosurgical operations the laser beam must be guided through a thin endoscopic probe, which can be inserted into the human brain and is equipped with a rinsing/aspiration system. Thus, the laser ablation must be performed within a surrounding of rinsing liquid. We performed in vitro ablation experiments with a two-stage picosecond Nd:YLF laser system at 1053 nm to investigate the effects of liquid media on the ablation efficiency and quality. Ablations of fresh bovine tissue within a surrounding of distilled water and physiological saline, respectively, showed a nearly linear dependency of ablation depth on applied energy. The tissue residuals. The diameters of single ablation fragments were measured to be less than 50 micrometers . Following these results and taking into account the absorption of physiological saline, we designed the focusing optics as well as the aspiration channels inside the stereotactic laser probe. We also present the working principle and main system parameters of the stereotactic laser probe and describe the assigned operating strategy.

Paper Details

Date Published: 5 December 1996
PDF: 8 pages
Proc. SPIE 2923, Laser-Tissue Interaction and Tissue Optics II, (5 December 1996); doi: 10.1117/12.260733
Show Author Affiliations
Marcus H. Goetz, Univ. of Heidelberg (Germany)
Stefan K. Fischer, Univ. of Heidelberg (Germany)
Burkhard A. Groh, Univ. of Heidelberg (Germany)
Michael H. Ott, Univ. of Heidelberg (Germany)
Stefan Goelz, Univ. of Heidelberg (Germany)
Josef F. Bille, Univ. of Heidelberg (Germany)

Published in SPIE Proceedings Vol. 2923:
Laser-Tissue Interaction and Tissue Optics II
Hansjoerg Albrecht; Guy P. Delacretaz; Thomas H. Meier; Rudolf W. Steiner; Lars Othar Svaasand, Editor(s)

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