Interstitial thermotherapy with bipolar rf applicators: computer-aided therapy control and monitoring

Thomas Stein; Kai Desinger; Andre Roggan; Gerhard J. Mueller

doi:10.1117/12.335792

4 January 1999 Interstitial thermotherapy with bipolar rf applicators: computer-aided therapy control and monitoring

Thomas Stein, Kai Desinger, Andre Roggan, Gerhard J. Mueller

Proceedings Volume 3565, Thermal Therapy, Laser Welding, and Tissue Interaction; (1999) https://doi.org/10.1117/12.335792
Event: BiOS Europe '98, 1998, Stockholm, Sweden

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.

Citation Download Citation

Thomas Stein, Kai Desinger, Andre Roggan, and Gerhard J. Mueller "Interstitial thermotherapy with bipolar rf applicators: computer-aided therapy control and monitoring", Proc. SPIE 3565, Thermal Therapy, Laser Welding, and Tissue Interaction, (4 January 1999); https://doi.org/10.1117/12.335792

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