PMID: 9194130Jun 1, 1997Paper

Design of applicators for a 27 MHz multielectrode current source interstitial hyperthermia system; impedance matching and effective power

Physics in Medicine and Biology
R S KaateeA G Visser

Abstract

In interstitial heating one of the main requirements for achieving a certain elevated temperature in a tumour is that the effective power per applicator (Peff), i.e. the power which is actually deposited in the tissue, is sufficiently high. In this paper this requirement is discussed for the applicators of the 27 MHz multielectrode current source (MECS) interstitial hyperthermia (IHT) system. To minimize power reflection, the applicator impedance was matched with the generator impedance by adjusting the length of the coaxial cable in between. Transmission line losses, applicator efficiency and subsequently Peff were computed for several applicator types. The actual Peff per electrode was obtained from calorimetric measurements. Experiments with RC loads, which can be seen as perfect applicators, were performed to investigate the effect of mismatching on Peff. Applicator losses were measured for clinically used applicators, both single- and dual-electrode, utilizing saline phantoms. A simple spherical tumour model, using the effective heat conductivity (keff) to account for heat transport, was used to estimate Peff for a given tumour size, implant size and applicator density. Computations of Peff of various MECS-IHT electrodes w...Continue Reading

References

Jun 1, 1991·Physics in Medicine and Biology·J CrezeeJ J Lagendijk
Jul 1, 1989·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·C MarchalG Prieur
Mar 1, 1989·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·A G VisserG C van Rhoon
Sep 1, 1993·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·A A De LeeuwJ J Lagendijk
Nov 1, 1996·Physics in Medicine and Biology·C GabrielE Corthout

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Citations

Apr 28, 2001·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·R S KaateeA G Visser
May 15, 2002·International Journal of Radiation Oncology, Biology, Physics·Marco van VulpenJan J Battermann
May 14, 1999·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·J CrezeeJ J Lagendijk
Jan 22, 2011·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Cafiero FranconiFrancesco Pesce
Mar 4, 1998·Physics in Medicine and Biology·J F van der KoijkJ J Lagendijk

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