Electromagnetic measurement and modeling techniques for microwave ablation probes.
Broadband scattering parameter measurement of a commercially available microwave ablation probe over the course of a 10 minute 45 Watt ablation cycle within ex-vivo bovine liver tissue is performed. Measurement results are compared to finite difference time domain simulation of the probe in non-ablated and fully ablated tissue geometries. Measurement and simulation results agree well from 0-3 GHz demonstrating the accuracy of a multi-compartmental ablation geometry modeling technique. The electromagnetic modeling technique presented in this paper introduces a useful design tool for optimizing microwave ablation probes without the need for multi-physics simulation packages. The relevance of tissue complex permittivity change with temperature to microwave ablation probe performance is discussed.
Brannan
Joseph D
JD
Covidien Energy Based Devices Boulder, CO 80301, USA. joseph.brannan@covidien.com
D000818:Animals; D001698:Biomedical Engineering / Q000379:methods; D017115:Catheter Ablation / Q000295:instrumentation / Q000379:methods*; D002417:Cattle; D003198:Computer Simulation; D004867:Equipment Design; D008099:Liver / Q000378:metabolism; D008872:Microwaves; D008962:Models, Theoretical; D011827:Radiation; D012542:Scattering, Radiation; D012984:Software; D013696:Temperature