NDLI: Low-frequency RF hyperthermia. IV. A 27 MHz hybrid applicator for localized deep tumor heating

Content Provider	IEEE Xplore Digital Library
Author	Francomi, C. Raganella, L. Tiberio, C.A. Begnozzi, L.
Copyright Year	1964
Abstract	A novel 27-MHz dual-device applicator for noninvasively and safely heating tumor masses at depth is proposed. A substantially localized temperature gain is obtained by superimposing two delocalized low RF frequency and phase-coherent current distributions, which are launched to constructively interfere over a limited region encompassing the tumor volume. A hybrid applicator (HA), integrating one capacitive and one inductive heating device was developed and assessed on a 20-cm-diameter cylindrical fat-muscle phantom. The interference pattern is characterized by a deep broad specific absorption rate (SAR) maximum and by the disappearance of the central null SAR value typical of single inductive devices. An 80% SAR useful therapeutic volume (UTV) of a near-cylindrical shape of about 800 cm/sup 3/ was obtained with a penetration of 6-8 cm for the phantom surface, with a noncritical axial length of approximately 21 cm. The UTV may be somehow controlled in size and penetration. These results are obtained with the tissuelike medium surrounding the UTV heated uniformly and safely to a temperature pedestal below the therapeutic temperature with about half RF power values to each of the heating devices.<>
Sponsorship	IEEE Engineering in Medicine and Biology Society
Page Count	7
File Size	854198
Starting Page	287
Ending Page	293
File Format	PDF
ISSN	00189294
Volume Number	38
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1991-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Hyperthermia Applicators Neoplasms Heating Imaging phantoms Specific absorption rate Temperature distribution Current distribution Interference
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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