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Proceedings Paper

Microwave antenna array for prostrate hyperthermia
Author(s): B. Stuart Trembly; P. Jack Hoopes; Karen L. Moodie; Arik S. Dvinsky
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Paper Abstract

A pair of microwave applicators was developed to produce controlled elevation of temperature in the prostate. One applicator was designed for placement in the urethra; it has a diameter of 6 mm and is flexible. This applicator incorporates a choked, resonant microwave dipole with an omnidirectional heating pattern and an air cooling system to control the temperature of the urothelium. The second applicator was designed for placement in the rectum; it has a diameter of 18 mm and is rigid. It incorporates an eccentric, choked, resonant microwave dipole that radiates toward the prostate with a front-to-back power ratio of about twenty. An air cooling system controls the temperature of the rectal mucosa. The applicators are driven at 915 MHz with a phase difference chosen to produce the maximum temperature in the central prostate. We heated the prostates of eight canine subjects with the transurethral and transrectal applicators. After one or two months of followup in four subjects, the prostates and surrounding tissues were evaluated histologically. We present experimental measurements of the power deposition patterns of the applicators and the 3D temperature distributions in vivo, and we correlate the thermal dose with histopathological observations.

Paper Details

Date Published: 19 May 1999
PDF: 12 pages
Proc. SPIE 3594, Thermal Treatment of Tissue with Image Guidance, (19 May 1999); doi: 10.1117/12.348746
Show Author Affiliations
B. Stuart Trembly, Dartmouth College (United States)
P. Jack Hoopes, Dartmouth-Hitchcock Medical Ctr. (United States)
Karen L. Moodie, Dartmouth-Hitchcock Medical Ctr. (United States)
Arik S. Dvinsky, Daat Research Corp. (United States)

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

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