Title :
Numerical model of microwave ablation of the myocardium
Author :
Kaouk, Z. ; Khebir, A. ; Savard, P.
Author_Institution :
Inst. de Genie Biomed., Ecole Polytech. de Montreal, Que., Canada
Abstract :
A heart-torso model based on the finite element method (FEM) is used to predict the behavior of an axisymmetric well coupled loaded monopole for use in cardiac hyperthermia. Both the electromagnetic and the thermal problems are solved for the axisymmetric geometry. In order to determine the effect of antenna design and frequency on the temperature distribution, lesions were simulated with 915 and 2450 MHz loaded monopoles. The heating patterns from the microwave antenna were compared to that induced by a similar active electrode at 500 kHz (RF energy). Heating patterns induced by RF energy drop off more abruptly both radially and axially than MW energy, resulting in a lesion depth twice the size for the MW antenna
Keywords :
biological effects of microwaves; cardiology; finite element analysis; hyperthermia; microwave antennas; microwave heating; monopole antennas; muscle; physiological models; radiation therapy; temperature distribution; 2450 MHz; 915 MHz; antenna design; axisymmetric geometry; axisymmetric well coupled loaded monopole; cardiac hyperthermia; electromagnetic problems; finite element method; heart-torso model; heating patterns; lesion depth; lesions; loaded monopoles; microwave ablation; microwave antenna; myocardium; numerical model; temperature distribution; thermal problems; Electromagnetic heating; Finite element methods; Geometry; Hyperthermia; Lesions; Loaded antennas; Myocardium; Numerical models; Predictive models; Radio frequency;
Conference_Titel :
Engineering in Medicine and Biology Society, 1995., IEEE 17th Annual Conference
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-2475-7
DOI :
10.1109/IEMBS.1995.575108
