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Completely implantable hyperthermia applicator with externalized temperature monitoring: Tests in conductive gel
Author(s) -
Doss James D.,
McCabe Charles W.
Publication year - 1986
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595812
Subject(s) - antenna (radio) , electrical conductor , electrical impedance , imaging phantom , materials science , electrode , acoustics , biomedical engineering , radio frequency , transmission line , loop antenna , electrical engineering , dipole antenna , optics , antenna factor , physics , composite material , engineering , quantum mechanics
Development is underway on a hyperthermia applicator intended for complete implantation and long‐term use. Radio frequency energy is transmitted from an external antenna to a closely coupled subdermal antenna. This internal antenna is connected via a transmission line to deeply implanted electrodes. Changes in temperature at the electrodes result in a change in tissue resistivity which modifies the complex impedance seen at the external antenna terminals. This variation in antenna impedance (magnitude and/or phase angle) can, in principle, be utilized to indirectly monitor and regulate tissue temperature at the electrode location. Test results from conductive‐gel tissue phantom experiments are presented.