Microwave ablation of ex vivo bovine tissues using a dual slot antenna with a floating metallic sleeve
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Date
2016-08-16
Authors
Ibitoye, AZ
Nwoye, EO
Aweda, MA
Oremosu, AA
Annunobi, CC
Akanmu, ON
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor and Francis
Abstract
Purpose: To study the efficiency of a dual slot antenna with a floating metallic sleeve on the ablation of different ex vivo bovine tissues.
Materials and methods: COMSOL MultiphysicsVR version 4.4 (Stockholm, Sweden), which is based on
finite element methods (FEM), was used to design and simulate monopole and dual slot with sleeve
antennas. Power, specific absorption rate (SAR), temperature and necrosis distributions in the selected
tissues were determined using these antennas. Monopole and dual slot with sleeve antennas were
designed, simulated, constructed and applied in this study based on a semi-rigid coaxial cable. Ex vivo
experiments were performed on liver, lung, muscle and heart of bovine obtained from a public animal
slaughter house. The microwave energy was delivered using a 2.45 GHz solid-state microwave generator
at 40 W for 3, 5 and 10 min. Aspect ratio, ablation length and ablation diameter were also determined
on ablated tissues and compared with simulated results. Student’s t-test was used to compare
the statistically significant difference between the performance of the two antennas.
Results: The dual slot antenna with sleeve produces localised microwave energy better than the
monopole antenna in all ablated tissues using simulation and experimental validation methods. There
were significant differences in ablation diameter and aspect ratio between the sleeve antenna and
monopole antenna. Additionally, there were no significant differences between the simulation and
experimental results.
Conclusions: This study demonstrated that the dual slot antenna with sleeve produced larger ablation
zones and higher sphericity index in ex vivo bovine tissues with minimal backward heating when compared
with the monopole antenna.
Description
Keywords
Different tissues; microwave ablation; monopole antenna; sleeved antenna
Citation
Ibitoye, A. Z., Nwoye, E. O., Aweda M. A, Oremosu, A. A., Annunobi, C. C. & Akanmu, O. N. (2016). Microwave ablation of ex vivo bovine tissues using a dual slot antenna with a floating metallic sleeve. International Journal of Hyperthermia, 32(8), 923–930.