Heating characteristics of coaxial-slot antennas for minimally invasive microwave thermal therapy

Koichi Ito; Hiroyuki Yoshimura; Kazuyuki Saito; Lira Hamada

doi:10.1117/12.348747

19 May 1999 Heating characteristics of coaxial-slot antennas for minimally invasive microwave thermal therapy

Koichi Ito, Hiroyuki Yoshimura, Kazuyuki Saito, Lira Hamada

Proceedings Volume 3594, Thermal Treatment of Tissue with Image Guidance; (1999) https://doi.org/10.1117/12.348747
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

The authors have been studying thin coaxial-slot antennas for minimally invasive microwave thermal therapy, particularly, microwave interstitial hyperthermia and microwave coagulation therapy (MCT). In hyperthermia treatment, it is important to keep tumor temperature between 42 and 45 degree(s)C without overheating the surrounding normal tissue. Two different feeding ways to antenna elements are presented as practical and effective heating techniques. One is proper combination of coherent and incoherent feedings. The other is on-off power control. In the MCT treatment, however, tumors have to be heated up to at least 60 degree(s)C to coagulate cancer cells but less than 100 degree(s)C to avoid evaporation. The temperature rise in the tumor is so large that the temperature dependence of electrical properties of the tissue should be taken into account. The electrical properties of liver tissue were measured for various temperatures. Temperature distributions around the antenna inserted into the liver are simulated by using the FDTD method and the FDM (Finite Difference Method) where the temperature dependence of electrical properties of the tissue is considered.

Citation Download Citation

Koichi Ito, Hiroyuki Yoshimura, Kazuyuki Saito, and Lira Hamada "Heating characteristics of coaxial-slot antennas for minimally invasive microwave thermal therapy", Proc. SPIE 3594, Thermal Treatment of Tissue with Image Guidance, (19 May 1999); https://doi.org/10.1117/12.348747

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