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Proceedings Paper

Interstitial thermotherapy with bipolar rf applicators: computer-aided therapy control and monitoring
Author(s): Thomas Stein; Kai Desinger; Andre Roggan; Gerhard J. Mueller
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Paper Abstract

A computer simulation of the temperature and damage distribution during a bipolar RFITT (radio-frequency current induced interstitial thermotherapy) application has been developed. The electric field and the heat transfer is calculated by the Finite Difference Method. The program calculates the distribution of electrical power density (heat generating term), temperature and tissue damage using standard and cooled bipolar needle applicators and displays the results graphically in real time. Whereby the changes of the tissue parameters due to the heating process are also taken into account. The computer program can not only be a means for therapy planning but as well for on-line therapy control. For this the program has the option to measure the output power of the RF-surgery generator and the tissue impedance via an A/D-converter. This gives more accurate simulation results. Furthermore the power output of the RF- generator can be controlled by the program via a D/A- converter. The option of measuring and steering the generator power allows the possible implementation of various control algorithms with the aim of performing an interstitial coagulation with high efficiency.

Paper Details

Date Published: 4 January 1999
PDF: 14 pages
Proc. SPIE 3565, Thermal Therapy, Laser Welding, and Tissue Interaction, (4 January 1999); doi: 10.1117/12.335792
Show Author Affiliations
Thomas Stein, Universitaetsklinikum Benjamin Franklin de Freien Univ. Berlin (Germany)
Kai Desinger, Universitaetsklinikum Benjamin Franklin der Freien Univ. Berlin (Germany)
Andre Roggan, Universitaetsklinikum Benjamin Franklin der Freien Univ. Berlin (Germany)
Gerhard J. Mueller, Universitaetsklinikum Benjamin Franklin der Freien Univ. Berlin and Laser- und Medizin-Tec (Germany)

Published in SPIE Proceedings Vol. 3565:
Thermal Therapy, Laser Welding, and Tissue Interaction
Stephen G. Bown; Guy P. Delacretaz; Guilhem Godlewski M.D.; Gerhard J. Mueller; Roberto Pini; Hans-Dieter Reidenbach; Rudolf W. Steiner; Lars Othar Svaasand; Karl-Goran Tranberg, Editor(s)

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