Effect of a Catheter on SAR Distribution around Interstitial Antenna for Microwave Hyperthermia

Meng-Shien WU  Lira HAMADA  Koichi ITO  Haruo KASAI  

IEICE TRANSACTIONS on Communications   Vol.E78-B   No.6   pp.845-850
Publication Date: 1995/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Medical Applications of Electromagnetic Techniques)
microwave interstitial hyperthermia,  coaxial-slot antenna,  moment method,  current distribution,  

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This paper describes that the dielectric characteristics of a catheter around the interstitial antenna have an effect on the wavelength for current, and this effect results in the variation of the SAR (Specific Absorption Rate) distribution around the antenna. A theoretical study of SAR distribution ground a coaxial-slot antenna is performed. Analytical technique used is the moment method. Result and discussion on the effect of material and thickness of the catheter are presented. The wavelength for the current shortens with increasing dielectric constant or decreasing thickness of the catheter. Due to this variation of the wavelength for current, the SAR distributions take various shapes.