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Proceedings Paper

Comparison of simulation and experimental results for rf thermal treatment devices with or without cooling
Author(s): Thomas P. Ryan; S. Nahum Goldberg M.D.
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Paper Abstract

Thermal treatment to avoid a surgical procedure involves a variety of energy sources. In several sites, radiofrequency energy is used as a source of thermal treatment. In the course of controlling lesion volume and shape during therapy, a number of sizes and shapes of applicators can be used as well as cooling or power pulsing to control or increase lesion size. Multiple sources are also used with monopolar or sesquipolar radiofrequency power delivery to enlarge the treatment volume. Following extensive in-vitro and in-vivo testing to optimize lesion size with time, power, and device, a simulation was set up to correlate theoretical predictions with experimental results with and without blood flow. A finite element model was applied to simulate the electric field and by using the bioheat equation, a thermal profile over time was established for various device parameters used in the experiments. The damage integral was used to estimate lesion size of irreversible damage. These results were compared to experimental results to verify the model's accuracy in predicting lesion size of both in-vitro and in-vivo experiments.

Paper Details

Date Published: 19 May 1999
PDF: 12 pages
Proc. SPIE 3594, Thermal Treatment of Tissue with Image Guidance, (19 May 1999); doi: 10.1117/12.348736
Show Author Affiliations
Thomas P. Ryan, Valleylab Inc. (United States)
S. Nahum Goldberg M.D., Beth Israel Deaconess Medical Ctr./Harvard Medical School (United States)

Published in SPIE Proceedings Vol. 3594:
Thermal Treatment of Tissue with Image Guidance
Thomas P. Ryan; Terence Z. Wong M.D., Editor(s)

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