Summary
International Symposium on Antennas and Propagation
2006
Session Number:2D2b
Session:
Number:2D2b-1
Experimental Estimation of Cooling Effect due to Blood Flow in a Thick Blood Vessel
Atsushi HIROE, Kazuyuki SAITO, Masaharu TAKAHASHI, Koichi ITO,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
Hyperthermia is one of the modalities for cancer treatment, utilizing the difference of thermal sensitivity between tumor and normal tissues. Therefore, the most important point in the treatment of the hyperthermia is that the tumor is heated up to the therapeutic temperature, between 42 and 45?C or more. Up to now, we have developed a coaxial-slot antenna for intracavitary microwave hyperthermia aiming at the treatment of the bile duct carcinoma. This antenna is inserted into the forceps channel of an endoscope and is led to the target tumor. Currently, there are thick blood vessels around the bile duct. Therefore, the cooling effect due to the thick blood vessels needs to be considered. In this paper, we investigated by measurement the cooling effect due to the blood flow in the thick blood vessel around the bile duct. At first, a tissueequivalent solid phantom with a cylindrical hole of 20 mm in diameter was fabricated. The cooling effect of the thick blood vessel is realized by pouring a saline solution into the cylindrical hole. Then, the antenna is placed at a distance of 5 mm from the cylindrical hole. As a result, the heated region is observed around the tip of the antenna, although there is a thick blood vessel close to the antenna. Moreover, we confirmed the effectiveness of the proposed phantom by comparing the resultant temperature distributions by measurement and the ones obtained by calculation.