Title :
Analysis and experimental validation of a triaxial antenna for microwave tumor ablation
Author :
Brace, Christopher L. ; Van der Weide, Daniel W. ; Lee, Fred T., Jr. ; Laeseke, Paul F. ; Sampson, Lisa
Author_Institution :
Dept. of Radiol., Wisconsin Univ., Madison, WI, USA
Abstract :
We apply a new triaxial antenna for microwave ablation procedures. The antenna consists of a coaxial monopole inserted through an 18-gauge biopsy needle positioned one quarter-wavelength from the antenna base. The biopsy needle creates a triaxial structure, which enhances return loss by more than 10 dB, thus limiting return currents along the feed line. Numerical simulations are used to optimize the antenna design. Numerical ex vivo experimental results are presented to quantify the field distribution, heating pattern and return loss of the antenna.
Keywords :
biomedical equipment; finite element analysis; microwave antennas; microwave heating; monopole antennas; optimisation; patient treatment; 10 dB; antenna base; antenna design optimization; biopsy needle; coaxial monopole; electromagnetic heating; feed line; field distribution quantification; finite element methods; heating pattern quantification; microwave ablation procedure; microwave tumor ablation; monopole antennas; numerical ex vivo experimental result; numerical simulation; return current limiting; return loss enhancement; return loss quantification; triaxial antenna application; Antenna feeds; Biopsy; Coaxial components; Dipole antennas; Electromagnetic heating; Impedance; Microwave antennas; Needles; Neoplasms; Probes;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1338842
