Title :
A multiloop concentric hyperthermia applicator with enhanced penetration depth
Author :
Cottis, P.G. ; Uzunoglu, Nikolaos K. ; Chatzarakis, G.E.
Author_Institution :
Dept. of Electr. Eng., Nat. Tech. Univ., Athens, Greece
fDate :
4/1/1988 12:00:00 AM
Abstract :
The electromagnetic field deposition into a three-layer cylindrical human-body model by a multiloop concentric hyperthermia applicator is investigated analytically. The multiloop radiator axis is taken to be coincident with the cylinder axis. A technique based on the method of separation of variables is used to determine the axisymmetric field in every point. In order to compute the imposed specific absorption rate in the tissues, a numerical integration technique is utilized. Numerical results are presented for several loop geometries at a 13-MHz operation frequency. The possibility of obtaining improved in-depth heating in comparison with conventional single-magnetic-loop applications is investigated. It is shown that significant enhancement of the penetration depth can be obtained by using a simple phased-magnetic-loop system
Keywords :
biomedical equipment; biothermics; electromagnetic field theory; integration; radiation therapy; radiofrequency heating; 13 MHz; RF heating; axisymmetric field; biomedical equipment; biothermics; electromagnetic field deposition; enhanced penetration depth; hyperthermia applicator; loop geometries; multiloop concentric type; multiloop radiator axis; numerical integration; phased-magnetic-loop system; specific absorption rate; three-layer cylindrical human-body model; tissues; variables separation; Applicators; Biological system modeling; Electromagnetic fields; Electromagnetic modeling; Geometry; Heating; Humans; Hyperthermia; Magnetic analysis; Magnetic separation;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
