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Proceedings Paper

Microwave array applicator for radiometry-controlled superficial hyperthermia
Author(s): Paul R. Stauffer; Svein Jacobsen; Daniel Neuman
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Paper Abstract

Hyperthermia therapy has been shown clinically effective for a variety of skin diseases but current heating equipment is inadequate for most patients. This effort describes the design and performance of a flexible microstrip array applicator intended for heating large regions of tissue over contoured anatomy while at the same time monitoring temperature of the underlying tissue by non-invasive radiometric sensing of blackbody radiation from the heated volume. For this dual purpose applicator, an array of broadband Archimedean spiral receive antennas is integrated into an array of Dual Concentric Conductor heating apertures. Applicator heating uniformity is assessed with electric field scans in homogenous muscle phantoms and with measured temperature distributions in clinical treatments of chestwall recurrence of breast carcinoma. The data demonstrate precisely controlled heating out to the perimeter of large (40 x 13 cm2) multiaperture conformal array applicators. Capabilities of the radiometry system are assessed by correlation of brightness temperatures measured in phantom loads of known temperature distribution as seen through an intervening 5 mm thick water bolus at constant 40°C. The radiometer demonstrates excellent sensitivity and an accuracy of +0.1-0.45°C for temperature measurements up to 5 cm deep in phantom when using a one dimensional weighting function analysis and up to 6 independent 500 MHz bandwidths within the 1-4 GHz range. The data clearly indicate that both heating and radiometric thermometry are possible using the same thin and flexible printed circuit board microstrip array applicator. Once development is complete, this dual mode conformal array applicator with multiplexed radiometric display system should provide significantly improved uniformity and ease of heating large area superficial tissue disease.

Paper Details

Date Published: 1 June 2001
PDF: 11 pages
Proc. SPIE 4247, Thermal Treatment of Tissue: Energy Delivery and Assessment, (1 June 2001); doi: 10.1117/12.427866
Show Author Affiliations
Paul R. Stauffer, Univ. of California/San Francisco (United States)
Svein Jacobsen, Univ. of Tromso (Norway)
Daniel Neuman, Univ. of California/San Francisco (United States)

Published in SPIE Proceedings Vol. 4247:
Thermal Treatment of Tissue: Energy Delivery and Assessment
Thomas P. Ryan, Editor(s)

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