Evaluation of the Effectiveness of Transurethral Radio Frequency Hyperthermia in the Canine Prostate: Temperature Distribution Analysis

[+] Author and Article Information
Liang Zhu

Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD 21250

Lisa X. Xu

Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J Biomech Eng 121(6), 584-590 (Dec 01, 1999) (7 pages) doi:10.1115/1.2800857 History: Received September 08, 1998; Revised July 28, 1999; Online October 30, 2007


The heating pattern of a transurethral radio frequency (RF) applicator and its induced steady-state temperature field in the prostate during transurethral hyperthermia treatment were investigated in this study. The specific absorption rate (SAR) of the electromagnetic energy was first quantified in a tissue-equivalent gel phantom. It was used in conjunction with the Pennes bioheat transfer equation to model the steady-state temperature field in prostate during the treatment. Theoretical predictions were compared to in vivo temperature measurements in the canine prostate and good agreement was found to validate the model. The prostatic tissue temperature rise and its relation to the effect of blood perfusion were analyzed. Blood perfusion is found to be an important factor for removal of heat especially at the higher RF heating level. To achieve a temperature above 44°C within 10 percent of the prostatic tissue volume, the minimum RF power required ranges from 5.5 W to 36.4 W depending on the local blood perfusion rate (ω = 0.2−1.5 ml/gm/min). The corresponding histological results from the treatment suggest that to obtain better treatment results, either higher RF power level or longer treatment time (>180 minutes) is necessary. This is consistent with the predictions from the theoretical model developed in this study.

Copyright © 1999 by The American Society of Mechanical Engineers
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