Computer-aided design of two-dimensional electric-type hyperthermia applicators using the finite-difference time-domain method

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Publication Type Journal Article
School or College College of Engineering
Department Bioengineering
Creator Christensen, Douglas A.
Other Author Shaw, Joseph A.; Durney, Carl H.
Title Computer-aided design of two-dimensional electric-type hyperthermia applicators using the finite-difference time-domain method
Date 1991-09
Description A hyperthermia applicator design tool consisting of a finite-difference time-domain (FDTD) technique in combination with a graphical display of electric fields and normalized linear temperature rise is described. This technique calculates, rather than assumes, antenna current distributions; it includes mutual interactions between the body and the applicator, and it calculates driving-point impedance and power delivered to the applicator. Results show that the fundamental limitation of 2-D electric-type applicators is overheating of the fat by normal components of the electric field, which exist because of near fields and capacitive coupling with the muscle. Two factors which contribute to the capacitance are the muscle conductivity and the small antenna size in air. Two examples of applicators designed to avoid fat overheating are described: a 27-MHz segmented dipole for heating large tumors to 7 cm depth, and a 100-MHz dipole for small tumors to 5 cm depth. The first uses a water bolus, and the second uses a water bolus with low-permittivity strips to reduce normal fields at the antenna ends. The results of this study describe fundamental limitations of electric field applicators, and illustrate the use of a powerful applicator design tool that allows rapid evaluation of a wide range of ideas for applicators which would require months and years to test experimentally.
Type Text
Publisher Institute of Electrical and Electronics Engineers (IEEE)
Journal Title IEEE Transactions on Biomedical Engineering
Volume 38
Issue 9
First Page 861
Last Page 870
DOI 10.1109/10.83606
citatation_issn 189294
Subject Finite-difference time-domain method; Hyperthermia applicator
Subject LCSH Time-domain analysis; Electric fields; Cancer -- Treatment; Thermotherapy -- Apparatus and instruments
Language eng
Bibliographic Citation Shaw, J. A., Durney, C. H., & Christensen, D. A. (1991). Computer-aided design of two-dimensional electric-type hyperthermia applicators using the finite-difference time-domain method. IEEE Transactions on Biomedical Engineering, 38(9), 861-70.
Rights Management (c) 1991 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. http://dx.doi.org/10.1109/10.83606
Format Medium application/pdf
Format Extent 1,079,928 bytes
Identifier ir-main,11681
ARK ark:/87278/s65h80vg
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2012-06-13
ID 706885
Reference URL https://collections.lib.utah.edu/ark:/87278/s65h80vg
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