Cooled microwave transrectal applicator with adjustable directional beam for prostate treatment

P. S. Debicki Department of Radiation Oncology, University of Southern California, School of Medicine, Kenneth Norris Cancer Hospital, 1441 Eastlake Ave, Los Angeles, CA, 90033, USA; Department of Microwave Technique and Optical Communication, Electronic Faculty, Politechnika Gdańska, ul. Narutowicza 11/12, PL80952, Gdańsk, Poland

M. Okoniewski Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia, V8W3P6, Canada; Department of Microwave Technique and Optical Communication, Electronic Faculty, Politechnika Gdańska, ul. Narutowicza 11/12, PL80952, Gdańsk, Poland

E. Okoniewska Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia, V8W3P6, Canada; Department of Microwave Technique and Optical Communication, Electronic Faculty, Politechnika Gdańska, ul. Narutowicza 11/12, PL80952, Gdańsk, Poland

P. N. Shrivastava Department of Radiation Oncology, University of Southern California, School of Medicine, Kenneth Norris Cancer Hospital, 1441 Eastlake Ave, Los Angeles, CA, 90033, USA

A. M. Debicka Department of Radiation Oncology, University of Southern California, School of Medicine, Kenneth Norris Cancer Hospital, 1441 Eastlake Ave, Los Angeles, CA, 90033, USA

L. V. Baert Department of Urology, Katholieke Universiteit Leuven, Brusselstraat 69, Leuven, Belgium

Z. Petrovich Department of Radiation Oncology, University of Southern California, School of Medicine, Kenneth Norris Cancer Hospital, 1441 Eastlake Ave, Los Angeles, CA, 90033, USA

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Abstract

A new intracavitary applicator design for microwave hyperthermia, particularly for transrectal prostate treatment, is presented. It includes an exchangeable multisection antenna that enables us to create a required longitudinal heating pattern, a cooling system to shift the maximum temperature away from the surface and a microwave reflecting system embedded in the cooling system that allows one to shape the irradiation beam in a transverse direction. Independent control of the longitudinal and transverse irradiation patterns of the applicator along with the cooling system, enable precise heating of selected tissues. Results of SAR measurements, E-field measurements and steady state temperature distributions, in solid and liquid tissue-equivalent phantoms arc presented. Clinical performance of this applicator was evaluated earlier in patients hexed intraoperatively and in a phase I clinical study. The applicator was found capable of effectively heating a tissue volume extending radially 3–25 nim from the applicator surface, angularly defined by configuration of reflecting system and longitudinally determined by specific choice of the multisection antenna.

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Cooled microwave transrectal applicator with adjustable directional beam for prostate treatment

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Cooled microwave transrectal applicator with adjustable directional beam for prostate treatment

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