Helical Slot Antenna for the Microwave Ablation

Lee, Moonhee; Son, Taeho

doi:10.1155/2019/2126879

Cited by 19 publications

(10 citation statements)

References 23 publications

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“…As can be seen that higher input power at lower frequency results in larger ablation volume/diameter as in References 14,43 but at higher power, boiling of water content is evident which may result in impedance mismatch and heating of applicator. 46 Comparable results are seen between Moonhee et al 43 and this work in terms of ablation diameter (T). However, a similar ablation zone at 20 W is achieved as compared to 50 W. Eman et al 44 used lower input power but this may lead to slower heating and hence blood perfusion rate may have a major impact on ablation outcome at in-vivo trials.…”

Section: Discussionsupporting

confidence: 64%

Design of a novel externally‐tapped intertwining helical antenna for microwave ablation and its statistical analysis on tissue model

Singh

Yadav

2021

Int J RF Mic Comp-Aid Eng

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Cancer is the leading cause of death in recent centuries and microwave ablation (MWA) has been evolving to thermally treat cancerous tissue through cell necrosis and is also a promising substitute to radio frequency ablation. In this article, a novel normal-mode helical antenna based MWA probe is investigated for the effect on ablation diameter in the presence of five critical parameters. The antenna consists of an intertwining helix structure mounted on a very small ground plane. An external tapping is used to match the antenna impedance. In the proposed design at the center frequency, a reflection coefficient of more than 23 dB without insertion into the tissue model and a reflection coefficient of more than 14 dB with insertion into the tissue model have been observed at 5 GHz frequency. The gain and percentage bandwidth of the antenna is 0.6 dB and 10%, respectively. At 20 W power, a maximum ablation diameter of 32 mm (transversal-T) and 44 mm (axial-A) is reached within 5 min of application time at a distance of 30 mm from the probe. Further, the L27 Taguchi's orthogonal array has been employed to study the effect on ablation diameter by varying five thermo-electrical parameters. The outcome of Taguchi's analysis has been ranked according to the contribution of each parameter. Further, F-and p-value test has been employed using analysis of variance to study the significance of each parameter on ablation diameter.

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Section: Discussionsupporting

confidence: 64%

Design of a novel externally‐tapped intertwining helical antenna for microwave ablation and its statistical analysis on tissue model

Singh

Yadav

2021

Int J RF Mic Comp-Aid Eng

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“…For example, Liu et al [109] proposed specific model of double slot antenna which has the capability to form a figure-of-eight ablation pattern. Moreover, dual-slot antennas combined with a choke, a floating metallic sleeve, or a helical slot can also lead to the significant reduction in the backward heating and increase in the energy deposition into tissues [62,86,101].…”

Section: Design Of Antenna Slotsmentioning

confidence: 99%

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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“…The one that has had the most promising results in multiple tissues such as the bone and liver is microwave ablation performed by needle applicators. Tests with different models of antennas have been carried out to optimize the treatment [ 4 – 6 ]. Puncture planning methods have been developed to make procedures more accurate [ 7 ], and it has been shown to be more effective and safe than other therapies.…”

Section: Introductionmentioning

confidence: 99%

Computational FEM Model and Phantom Validation of Microwave Ablation for Segmental Microcalcifications in Breasts Using a Coaxial Double-Slot Antenna

Félix

Guerrero

Rubio

et al. 2021

BioMed Research International

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Introduction. Cancer is the second leading cause of death worldwide. Breast cancer is the second most common cause of cancer-related mortality, accounting for 11.6% of the total number of deaths. The main treatments for this disease are surgical removal of the tumor, radiotherapy, and chemotherapy. Recently, different minimally invasive technologies have been applied (e.g., emission of electromagnetic waves, thermal and chemical means) to overcome the important side effects of these treatment modalities. The objective of this study was to develop and evaluate a predictive computational model of microwave ablation. Materials and Methods. The predictive computational model of microwave ablation was constructed by means of a dual-slot coaxial antenna. The model was compared with an experiment performed using a breast phantom, which emulates the dielectric properties of breast tissue with segmental microcalcifications. The standing wave ratio (SWR) was obtained for both methods to make a comparison and determine the feasibility of applying electromagnetic ablation to premalignant lesions in breasts. Specifically, for the analysis of segmental microcalcifications, a breast phantom with segmental microcalcifications was developed and two computational models were performed under the same conditions (except for blood perfusion, which was excluded in one of the models). Results. The SWR was obtained by triplicate experiments in the phantom, and the measurements had a difference of 0.191 between the minimum and maximum SWR values, implying a change of power reflection of 0.8%. The average of the three measurements was compared with the simulation that did not consider blood perfusion. The comparison yielded a change of 0.104, representing a 0.2% change in power reflection. Discussion. Both experimentation in phantom and simulations demonstrated that ablation therapy can be performed using this antenna. However, an additional optimization procedure is warranted to increase the efficiency of the antenna.

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Helical Slot Antenna for the Microwave Ablation

Cited by 19 publications

References 23 publications

Design of a novel externally‐tapped intertwining helical antenna for microwave ablation and its statistical analysis on tissue model

Design of a novel externally‐tapped intertwining helical antenna for microwave ablation and its statistical analysis on tissue model

A review of antenna designs for percutaneous microwave ablation

Computational FEM Model and Phantom Validation of Microwave Ablation for Segmental Microcalcifications in Breasts Using a Coaxial Double-Slot Antenna

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