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Optimal parameters for the efficient microwave ablation of liver tumor from the 3D-IRCADb-01 database

Bošković Nikola, Radjenovic Branislav, Radmilović-Radjenović Marija

Acta of Bioengineering and Biomechanics

2024

Vol. 26, no. 1

47--54

Microwave ablation is a minimally invasive thermal modality for cancer treatment with high survival and low recurrence rates. Despite the unquestionable benefits of microwave ablation, the interaction between the medical instruments and the tissue may cause damage to the healthy tissue around the tumor. Such damages can be removed by clarifying the conditions for their development. In addition to clinical methods, computer simulations have become very effective tools for optimizing microwave ablation performance. Methods: The study was focused on the determination of the optimal input power for complete microwave tumor ablation with an adequate safety margin avoiding injury to the surrounding healthy tissue. In three-dimensional simulations, the liver tumor model was based on a real tumor (1.74 cm × 2.40 cm × 1.43 cm) from the 3D-IRCADb-01 database. Calculations were performed for a 10-slot antenna proven to achieve a higher degree of ablation zone localization than a standard single-slot antenna. The temperature-dependent dielectric and thermal properties of healthy and tumoral liver tissue, blood perfusion, and water content were included in the model. Results: The obtained simulation results revealed that the proper choice of input power ensures that necrotic tissue is mainly located in the tumor with minimal damage to the surrounding healthy tissue. Conclusions: This study may represent a step forward in the planning of individual microwave ablation treatment for each patient.

Evaluation of the performance of designed coaxial antennas for hyperthermia using simulation and experimental methods

Ibitoye Ayo Z., Ogese Obande C., Adedokun Margaret B., Habeebu Muhammad Y., Nwoye Ephraim O., Aweda Adebayo M.

Polish Journal of Medical Physics and Engineering

2021

Vol. 27, Iss. 1

109--117

Introduction: Antenna geometries and tissue properties affect microwave energy distributions during microwave ablation procedures. There is paucity information on the potential of antenna fabricated from a thick semi-rigid coaxial cable in the field of microwave thermal therapy. This study aimed at comparing the performance of two dual-slot antennas designed from different semi-rigid coaxial cables for the ablation of a liver tumour using numerical simulation and experimental validation methods. Materials and Methods: COMSOL Multiphysics software was used for designing dual-slot antennas and as well as to evaluate microwave energy deposition and heat distribution in the liver tissue. Experimental validations were conducted on the ex-vivo bovine livers to validate the simulation results. Results: Thick antenna developed in this study produced a higher sphericity index, larger ablation diameter and reduced backward heating along the antenna shaft than the existing one. The experimental validation results also indicate significant differences between the two antennas in terms of ablation diameters (p = 0.04), ablation lengths (p = 0.02) and aspect ratios (p = 0.02). Conclusion: Based on the findings in this study, antenna fabricated from a thick coaxial cable has a higher potential of localizing microwave energy in the liver than conventional antennas.

Antena do ablacji mikrofalowej o kierunkowej charakterystyce promieniowania

Cała P., Bieńkowski P.

Przegląd Elektrotechniczny

2018

R. 94, nr 1

9--12

W pracy przedstawiono koncepcję oraz projekt anteny do ablacji mikrofalowej o kierunkowej charakterystyce promieniowania, która może być wykorzystana do zastosowań biomedycznych. Antena pracuje w paśmie mikrofalowym ISM 2.4GHz. W pracy skupiono się na optymalizacji rozmiarów elementu promieniującego w celu otrzymania dopasowania impedancyjnego na poziomie nie większym niż-14dB (WFS<1.5) oraz uzyskaniu kierunkowej charakterystyki promieniowania.

The paper presents the concept and design of an interstitial microwave hyperthermia antenna with directional radiation characteristics that can be used for biomedical applications. The antenna works in the microwave band of ISM2.4GHz. The work focused on optimizing the size of the radiating element to obtain an impedance matching less than -14dB (VSWR <1.5) and obtaining directional radiation pattern.