Microwave ablation with a triaxial antenna: results in ex vivo bovine liver

We apply a new triaxial antenna for microwave ablation procedures to an ex vivo bovine liver. The antenna consists of a coaxial monopole inserted through a biopsy needle positioned one quarter-wavelength from the antenna base. The insertion needle creates a triaxial structure, which enhances return...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-01, Vol.53 (1), p.215-220
Main Authors: Brace, C.L., Laeseke, P.F., van der Weide, D.W., Lee, F.T.
Format: Article
Language:English
Subjects:
Ablation
Antennas
Applied sciences
Biopsy
Bovine
Circuit properties
Coaxial components
Electric, optical and optoelectronic circuits
Electromagnetic heating
Electronics
Energy exchange
Exact sciences and technology
Feeds
Heating
Insertion
Lesions
Liver
microwave (MW) ablation
Microwave antennas
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
MW heating
Needles
Radiocommunications
Telecommunications
Telecommunications and information theory
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Summary:We apply a new triaxial antenna for microwave ablation procedures to an ex vivo bovine liver. The antenna consists of a coaxial monopole inserted through a biopsy needle positioned one quarter-wavelength from the antenna base. The insertion needle creates a triaxial structure, which enhances return loss more than 10 dB, maximizing energy transfer to the tissue while minimizing feed cable heating and invasiveness. Numerical electromagnetic and thermal simulations are used to optimize the antenna design and predict heating patterns. Numerical and ex vivo experimental results show that the lesion size depends strongly on ablation time and average input power, but not on peak power. Pulsing algorithms are also explored. We were able to measure a 3.8-cm lesion using 50 W for 7 min, which we believe to be the largest lesion reported thus far using a 17-gauge insertion needle.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2004.839308