Reduced-Diameter Designs of Coax-Fed Microwave Ablation Antennas Equipped With Baluns

Luyen, Hung; Hagness, Susan C.; Behdad, Nader

doi:10.1109/lawp.2016.2637874

Cited by 30 publications

(15 citation statements)

References 10 publications

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“…Recently, techniques have been introduced for the reduction of the diameter of conventional antennas by embedding the choke or sleeve within coaxial cables. Specifically, due to the lower permittivity of air, Luyen et al [35] found that the diameter of Fig. 3.…”

Section: Addition Of the Sleeve Choke Or Capmentioning

confidence: 99%

“…Unfortunately, this is at the expense of an increase in the diameter of the antenna. To keep the antenna as small as possible, some researchers have proposed to modify the inner structure of antennas such that the sleeves or chokes are implemented inside the antenna [35][36][37]. Further studies showed that the backward heating can be also restrained by adding antenna slots or a cooling system, optimizing the outer conductor structure, or changing the frequency of electromagnetic energy [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

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A review of antenna designs for percutaneous microwave ablation

et al. 2021

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Microwave (MW) antenna is a key element in microwave ablation (MWA) treatments as the means that energy is delivered in a focused manner to the tumor and its surrounding area. The energy delivered results in a rise in temperature to a lethal level, resulting in cell death in the ablation zone. The delivery of energy and hence the success of MWA is closely dependent on the structure of the antennas. Therefore, three design criteria, such as expected ablation zone pattern, efficiency of energy delivery, and minimization of the diameter of the antennas have been the focus along the evolution of the MW antenna. To further improve the performance of MWA in the treatment of various tumors through inventing novel antennas, this article reviews the state-of-the-art and summarizes the development of MW antenna designs regarding the three design criteria.

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Section: Addition Of the Sleeve Choke Or Capmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review of antenna designs for percutaneous microwave ablation

et al. 2021

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“…Operation of the chocked antenna is based on choking the excited currents on the outer surface of the outer conductor of the coaxial antenna. One of the most common techniques used to choke such unwanted currents is to use a coaxial balun [53]. The coaxial balun is realized by encircling the coaxial antenna with a hollow conducting tube which is electrically isolated from the surface of the coaxial antenna by a dielectric material.…”

Section: Sar Distribution and Control Of Ablation Areamentioning

confidence: 99%

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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“…Figure 12b shows a technique for incorporating a choke or sleeve within the antenna without increasing its diameter. 19 The technique utilizes an air-filled coaxial section at the end of the common Teflon-filled coaxial feedline with the goal of achieving a smaller diameter. Using air and Teflon permittivity to calculate the dimensions of a coaxial cable with 50 Ω characteristic impedance, a 30% smaller diameter is obtained for the same inner conductor diameter.…”

Section: Mw Ablation Applicatorsmentioning

confidence: 99%

“…Techniques for reducing applicator diameter: (A) Matching network (adapted from Luyen et al 18 ); (b) reduced diameter by using a different dielectric material (adapted from Luyen et al 19 ); and (c) tapered balun (adapted from Luyen et al 20 ) (black: metal, grey: dielectric, white: air)…”

Section: Figmentioning

confidence: 99%

Antenna Designs for Microwave Tissue Ablation

Fallahi

Prakash

2018

Crit Rev Biomed Eng

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Microwave (MW) ablation has emerged as a minimally invasive therapeutic modality and is in clinical use for treatment of unresectable tumors and cardiac arrhythmias, neuromodulation, endometrial ablation, and other applications. Components of image-guided MW ablation systems include high-power MW sources, ablation applicators that deliver power from the generator to the target tissue, cooling systems, energy-delivery control algorithms, and imaging guidance systems tailored to specific clinical indications. The applicator incorporates a MW antenna that radiates MW power into the surrounding tissue. A variety of antenna designs have been developed for MW ablation with the objective of efficiently transferring MW power to tissue, with a radiation pattern well matched to the size and shape of the targeted tissue. Here, we survey advances in percutaneous, endocavitary, and endoscopic antenna designs as an integral element of MW ablation applicators for a diverse set of clinical applications.

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Reduced-Diameter Designs of Coax-Fed Microwave Ablation Antennas Equipped With Baluns

Cited by 30 publications

References 10 publications

A review of antenna designs for percutaneous microwave ablation

A review of antenna designs for percutaneous microwave ablation

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

Antenna Designs for Microwave Tissue Ablation

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