PMID: 8938032Nov 1, 1996Paper

Power absorption and temperature control of multi-filament palladium-nickel thermoseeds for interstitial hyperthermia

Physics in Medicine and Biology
N van WieringenT C Cetas

Abstract

In interstitial hyperthermia using ferromagnetic seeds, multi-filament seeds have gained interest because of a more effective power absorption than solid seeds. Palladium-nickel (PdNi) seeds composed of filaments with diameters in the range from 0.1 to 1.0 mm (maximally 90 filaments) have been investigated to find the conditions for optimal power absorption and temperature control. Magnetic and calorimetric experiments have shown that a decreasing filament radius results in a more effective power absorption. The power absorption approaches a common asymptote for high field intensities at all filament diameters. This asymptotic behaviour can be understood as a consequence of the approach of saturation magnetization of PdNi. The sharpness of the transition at the Curie temperature, which is a measure for the quality of temperature control, improves as the magnetic field strength increases, but it is limited by the asymptote of the power absorption. When the asymptote has been reached the quality of temperature regulation of a seed can only be improved by increasing the amount of PdNi, e.g. by increasing the number of filaments. Calculations of the power absorption, using the generally applied theory based on a linear relation bet...Continue Reading

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Citations

Jan 12, 2002·Journal of Biomedical Materials Research·Uyen T LeJoon B Park
Mar 6, 2007·Journal of Materials Science. Materials in Medicine·Adly H El-SayedA A EI-Gendy
Oct 25, 2002·Journal of Endourology·Jamil RehmanRalph V Clayman
Mar 1, 1997·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·N van WieringenG J Nieuwenhuys
Jul 1, 1997·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·J F van der KoijkJ J Battermann
Oct 24, 2009·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Niek van WieringenJohannes Crezee
Jan 28, 1998·IEEE Transactions on Bio-medical Engineering·T C CetasY Contractor
Nov 4, 2016·Medical Physics·Gregory WarrellE Ishmael Parsai
May 26, 2017·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·H P KokJ Crezee
Jun 28, 2002·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Byeong Ho ParkMoon Kon Kim
May 1, 1997·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·N van WieringenG J Nieuwenhuys
Jun 25, 2020·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·H Petra KokJohannes Crezee
Mar 4, 1998·Physics in Medicine and Biology·A N KotteJ J Lagendijk

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