PMID: 9421742Jan 9, 1998Paper

Numerical analysis of capacitively coupled electrodes for interstitial hyperthermia

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
J F van der KoijkJ J W Lagendijk

Abstract

Multi electrode current source interstitial hyperthermia (MECS-IHT) employs individually controlled, 27 MHz radiofrequency electrodes inserted into plastic brachytherapy catheters. In order to get a firm understanding of the physical behaviour of the electrodes and to verify the current source approximation in our hyperthermia treatment planning system we have investigated (1) the electrical properties of the electrode-catheter-tissue system, and (2) the impact of inhomogeneity of the electrical properties of the tissue in the vicinity of the electrodes. The results validate the use of the ideal current source approximation in the treatment planning SAR model. The models predict the presence of a significant heat source inside the electrode wall when lossy catheter materials are used, producing a conductive heating component in addition to the SAR in the tissue. For a given catheter spacing this conductive component will produce a more heterogeneous temperature distribution. Thus, low-loss catheter materials like polyethylene and Teflon are recommended. The SAR is highly localized near the catheter. Calculations concerning a fat-muscle interface show that the SAR is higher in the fatty tissue than in the muscle tissue; 3D SAR c...Continue Reading

References

May 1, 1991·International Journal of Radiation Oncology, Biology, Physics·B EmamiT Samulski
Oct 1, 1990·IEEE Transactions on Bio-medical Engineering·M J Sowiński, P M van den Berg
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
Nov 1, 1995·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·R S KaateeA G Visser
Mar 1, 1996·Physics in Medicine and Biology·J F van der KoijkJ J Lagendijk
Oct 1, 1996·IEEE Transactions on Bio-medical Engineering·J de BreeJ J Lagendijk

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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
Jul 9, 1999·IEEE Transactions on Bio-medical Engineering·R J LeeK Hynynen
Mar 4, 1998·Physics in Medicine and Biology·J F van der KoijkJ J Lagendijk
May 9, 2002·Physics in Medicine and Biology·Per Daniel Tyréus, Chris J Diederich
Apr 14, 2000·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·J C CamartJ Pribetich
Jun 18, 2011·Journal of Applied Physiology·Hyo Won ChoiGhassan S Kassab

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