Analysis of efficiency of different antennas for microwave ablation using simulation and experimental methods

Ibitoye, A. Z.; Orotoye, T.; Nwoye, E. O.; Aweda, Moses Adebayo

doi:10.1016/j.ejbas.2018.01.005

Cited by 27 publications

(34 citation statements)

References 22 publications

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“…• Microwave frequencies are capable of propagating through all types of biological tissues [43], even those of low electrical and thermal conductivities. For example, bone and lung are two types of tissues that have low conductivity and permittivity, so, the MWA is more suitable than the RFA which has been associated with suboptimal performance when be used with such types of tissues [13], [20].…”

Section: A Advantages Of Mwa Over the Rfamentioning

confidence: 99%

“…The main requirements of the ideal interstitial cancer ablation antenna include a small diameter to minimize the invasiveness effect, a low input reflection coefficient, a localized SAR pattern at the operating frequency, and most importantly, a localized heating zone [17]. However, the choice of an antenna for MWA depends on clinical indications such as tumor size, location, and adjacent organs [43]. The most common antenna structure used for interstitial MWA is the coaxial antenna.…”

Section: Antenna Structures Used For Cancer Ablationmentioning

confidence: 99%

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About the Interstitial Microwave Cancer Ablation: Principles, Advantages and Challenges

et al. 2020

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This article presents a review of the interstitial microwave cancer ablation. Microwave cancer ablation is an effective technique for the cancer therapy using the electromagnetic radiations in the microwave range. The idea behind using the microwave electromagnetic radiations in cancer therapy is basically based on dielectric heating of the cancerous tissues until the death of the infected cells. This article reviews the theory of operation of the microwave cancer ablation technique with overview of the electrical properties of the biological tissues as they are key parameters to study the behavior of the cancer ablation process. Advantages of microwave cancer ablation technique over the other techniques especially its most related one, i.e., the radiofrequency cancer ablation are highlighted. Although the microwave cancer ablation has attained high attention by the researchers, many of challenges which degrade its performance still exist. The paper discusses the challenges of the microwave cancer ablation and highlights the efforts done by the researchers to tackle them. Different antenna structures utilized for microwave cancer ablation are presented with mention of their behavior, advantages and disadvantages. Moreover, some of the most recent progresses in the microwave cancer ablation field are presented.

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Section: A Advantages Of Mwa Over the Rfamentioning

confidence: 99%

Section: Antenna Structures Used For Cancer Ablationmentioning

confidence: 99%

About the Interstitial Microwave Cancer Ablation: Principles, Advantages and Challenges

et al. 2020

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“…The research in [35] present a coax-fed MWA antenna design for decreases the radiation of the monopole behind the reflector, creating an asymmetric SAR pattern by extending a portion of the outer conductor of the coaxial cable. In [36], the efficiency of different antennas for microwave ablation therapy were investigated using numerical simulation and experimental approach. The evaluation is on the reflection coefficient, power dissipation distribution, power dissipation density, specific absorption rate, and temperature distribution in tissue.…”

Section: Advanced Stage(c)mentioning

confidence: 99%

Optimal Antenna Slot Design for Hepatocellular Carcinoma Microwave Ablation Using Multi-Objective Fuzzy Decision Making

Nantivatana¹,

Phasukkit²,

Tungjitkusolmun³

et al. 2020

IJIES

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This paper presents the optimal antenna slot position and sizing (OASPS), for microwave (MW) hepatocellular carcinoma (HCC) treatment, using multi-objective fuzzy decision making (MOFDM). In the optimal design problem formulation, the multi-objective for, (1) achievement for a near-spherical zone for ablation defined by axial ratio (AR), (2) the minimum reflection coefficient (S 11), and (3) maximum volume of destroying (VD), are desired. The finite element method (FEM) is used for MW distribution simulation for coordination analysis with the proposed MOFDM based OASPS. The investigation on the design results shown that the temperature distribution of the proposed MOFDM for OASPS is in the more controllable shape comparing to the existing design, due to the sharp beam of temperature distribution to the target at the front side of slot with the less temperature distribution at the rare side of slot. The results also show that the proposed MOFDM for OASPS for OASPS design is easier to manage with the less effect to the rare side of the slot. Moreover, the proposed MOFDM for OASPS resulted in the temperature distribution shape closer to round shape than the existing design. The MOFDM for OASPS is tested on designing of the antenna build up from the coaxial cable. The coaxial cable used is Semi-rigid 141 (RG402 M17/130-RG402 Copper Jacket) including Inner conductor, Dielectric, and Outer conductor. In the simulation, the slot distance from conductor end (L ts), representing the slot position, is varied as 2.3mm, 3.3mm, 4.3mm, 5.3mm, 6.3mm, 7.3mm, and 8.3mm. Meanwhile, the slot size (W d), is varied as 1mm, 2mm, 3mm, 4mm, 5mm, and 6mm. The input power (P i) used is 50 W with the duration of 300 seconds. The comparison of obtained by different L ts and W d , is investigated. The simulation results show that the proposed MOFDM based OASPS can efficiently and effectively provide the near-spherical zone of ablation result with simultaneously trade-off between S 11 minimization and VD maximization.

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“…The coaxial-slot antenna is very important for MWA treatment due to its low cost, simplicity, small dimensions, and high efficiency [18,19]. Ibitoy et al [20] analyzed the efficiency of different antennas proposed for MWA. Their results show that the sleeve antenna produces the highest sphericity temperature distribution, and a double slot antenna has the largest ablation zone and aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Use of microwave ablation for thermal treatment of solid tumors with different shapes and sizes—A computational approach

et al. 2020

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Microwave Ablation (MWA) is one of the most recent developments in the field of thermal therapy. This approach is an effective method for thermal tumor ablation by increasing the temperature above the normal physiological threshold to kill cancer cells with minimum side effects to surrounding organs due to rapid heat dispersive tissues. In the present study, the effects of the shape and size of the tumor on MWA are investigated. To obtain the temperature gradient, coupled bio-heat and electromagnetic equations are solved using a threedimensional finite element method (FEM). To extract cellular response at different temperatures and times, the three-state mathematical model was employed to achieve the ablation zone size. Results show that treatment of larger tumors is more difficult than that of smaller ones. By doubling the diameter of the tumor, the percentage of dead cancer cells is reduced by 20%. For a spherical tumor smaller than 2 cm, applying 50 W input power compared to 25 W has no significant effects on treatment efficiency and only increases the risk of damage to adjacent tissues. However, for tumors larger than 2 cm, it can increase the ablation zone up to 21%. In the spherical and oblate tumors, the mean percentage of dead cells at 6 GHz is nearly 30% higher than that at 2.45GHz, but for prolate tumors, treatment efficacy is reduced by 10% at a higher frequency. Moreover, the distance between two slots in the coaxial double slot antenna is modified based on the best treatment of prolate tumors. The findings of this study can be used to choose the optimum frequency and the best antenna design according to the shape and size of the tumor.

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Analysis of efficiency of different antennas for microwave ablation using simulation and experimental methods

Cited by 27 publications

References 22 publications

About the Interstitial Microwave Cancer Ablation: Principles, Advantages and Challenges

About the Interstitial Microwave Cancer Ablation: Principles, Advantages and Challenges

Optimal Antenna Slot Design for Hepatocellular Carcinoma Microwave Ablation Using Multi-Objective Fuzzy Decision Making

Use of microwave ablation for thermal treatment of solid tumors with different shapes and sizes—A computational approach

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