Evaluation of temperature distributions during microwave ablation of ex vivo bovine liver using two types of antennas.
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Date
2019-03
Authors
Ibitoye, AZ
Nwoye, EO
Saseyi, AO
Adeneye, SO
Adedokun, MB
Aweda, MA
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Abstract
Introduction: Temperature distributions during microwave ablation are dependent on the antenna types, antenna
geometry, tissue properties, input power and ablation. All these factors can significantly affect the coagulation region,
ablation length, ablation diameter, aspect ratio, backward heating (comic effect), and degree of necrosis. Temperature
distributions during microwave ablation procedures determine the effectiveness of ablating tumours in tissue.
Objective: The aim of this study is to evaluate temperature distributions during microwave ablation using sleeved and
dual slot antennas.
Materials and Methods: In this study, sleeved and dual slot antennas were designed using COMSOL MULTIPHYSICS
software version 4.4. Temperature distributions were analyzed at 10 mm and 20 mm from the antennas’ surfaces. Dualslot
and sleeved antennas were fabricated from 0.085’ 50 Ω semi-rigid coaxial cable to conform to numerical simulation.
The antennas were applied on ex vivo bovine liver. Thermometer probes were placed at 10 mm and 20 mm from the
antennas’ surfaces with the input powers set at 30, 50 and 80 W for 300 s. Before each ablation, the initial temperature was
recorded whereas subsequent measurements were recorded at 50 s intervals. Numerical simulation and experimental
obtained data were analyzed and compared using the student's t-test statistical tool.
Results: The findings in this study showed that temperatures produced at the two points of measurements by the sleeved
antenna were greater than that of the dual-slot antenna in simulation and experimental procedures. Also, there was no
significant difference between simulation and experimentally results for dual-slot antenna and sleeved antenna (p = 0.25).
Conclusion: In conclusion, the sleeved antenna has the potential to ablate a tumour faster above the tumoricidal
temperatures at the same position than the dual-slot antenna.
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Scholarly articles
Keywords
Microwave ablation , Temperature distribution , Dual-slot antenna , Comsol , Multiphysics , Research Subject Categories::MEDICINE
Citation
Ibitoye, A. Z., Nwoye, E. O., Saseyi, A. O., Adeneye, S. O., Adedokun, M. B. & Aweda, M. A. (2019). Evaluation of temperature distributions during microwave ablation of ex vivo bovine liver using two types of antennas. Nigerian Journal of Pure & Applied Sciences, 32 (1): 3297-3306