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Proceedings Paper

Comparison of 2D temperature maps recorded during laser-induced thermal tissue treatment with corresponding temperature distributions calculated from 3D Monte-Carlo simulations
Author(s): Harald Busse; Martin Bublat; Ralf Ratering; Margarethe Rassek; Hans-Joachim Schwarzmaier M.D.; Thomas Kahn M.D.
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Paper Abstract

Minimally invasive techniques often require special biomedical monitoring schemes. In the case of laser coagulation of tumors accurate temperature mapping is desirable for therapy control. While magnetic resonance (MR)-based thermometry can easily yield qualitative results it is still difficult to calibrate this technique with independent temperature probes for the entire 2D field of view. Calculated temperature maps derived from Monte-Carlo simulations (MCS), on the other hand, are suitable for therapy planning and dosimetry but typically can not account for the extract individual tissue parameters and physiological changes upon heating. In this work, online thermometry was combined with MCS techniques to explore the feasibility and potential of such a biomodal approach for surgical assist systems. For the first time, the result of a 3D simulation were evaluated with MR techniques. An MR thermometry system was used to monitor the temperature evolution during laser-induced thermal treatment of bovine liver using a commercially available water-cooled applicator. A systematic comparison between MR-derived 2D temperature maps in different orientations and corresponding snapshots of a 3D MCS of the laser-induced processes is presented. The MCS is capable of resolving the complex temperature patterns observed in the MR-derived images and yields a good agreement with respect to absolute temperatures and damage volume dimensions. The observed quantitative agreement is around 10 degrees C and on the order of 10 percent, respectively. The integrated simulation-and-monitoring approach has the potential to improve surgical assistance during thermal interventions.

Paper Details

Date Published: 3 May 2000
PDF: 11 pages
Proc. SPIE 3911, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II, (3 May 2000); doi: 10.1117/12.384900
Show Author Affiliations
Harald Busse, GMD National Research Ctr. for Information Technology (Germany)
Martin Bublat, GMD National Research Ctr. for Information Technology (Germany)
Ralf Ratering, GMD National Research Ctr. for Information Technology (Germany)
Margarethe Rassek, Heinrich-Heine-Univ. (Germany)
Hans-Joachim Schwarzmaier M.D., Klinikum Krefeld (Germany)
Thomas Kahn M.D., Univ. Leipzig (Germany)

Published in SPIE Proceedings Vol. 3911:
Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II
Tuan Vo-Dinh; Warren S. Grundfest M.D.; David A. Benaron M.D., Editor(s)

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