Modelling the temperature-dependent RF ablation produced by the multi-tine electrode

Gas, Pacific

doi:10.15199/48.2020.01.12

Cited by 4 publications

(6 citation statements)

References 17 publications

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“…This rotation generates mechanical heat, which eventually leads to cellular necrosis [ 14 , 15 ]. Unlike radiofrequency ablation, it is not necessary to use a ground electrode for the more selective treatment of the lesion [ 16 , 17 ]. The treatment of breast lesions is partly based on the dielectric properties of cancer tissue in comparison with healthy breast tissue.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…For more accuracy in the solution, the tissue's thermal conductivity was considered as a function of temperature and represented as follows 30 :…”

Section: Propertiesmentioning

confidence: 99%

“…Thermal ablation undergoes a heat-sink effect due to heat convection between the blood vessels and tissue. 30 The heat sink effect may lead to inadequate ablation, which increases the chance of local tumor recurrence. 31 Additionally, excessive heat generation from high microwave power levels may lead to damage to blood vessels in close proximity to the antenna.…”

Section: Introductionmentioning

confidence: 99%

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Effect of high blood flow on heat distribution and ablation zone during microwave ablation‐numerical approach

Boregowda,

Mariappan

2024

Numer Methods Biomed Eng

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Microwave ablation has become a viable alternative for cancer treatment for patients who cannot undergo surgery. During this procedure, a single‐slot coaxial antenna is employed to effectively deliver microwave energy to the targeted tissue. The success of the treatment was measured by the amount of ablation zone created during the ablation procedure. The significantly large blood vessel placed near the antenna causes heat dissipation by convection around the blood vessel. The heat sink effect could result in insufficient ablation, raising the risk of local tumor recurrence. In this study, we investigated the heat loss due to large blood vessels and the relationship between blood velocity and temperature distribution. The hepatic artery, with a diameter of 4 mm and a height of 50 mm and two branches, is considered in the computational domain. The temperature profile, localized tissue contraction, and ablation zones were simulated for initial blood velocities 0.05, 0.1, and 0.16 m/s using the 3D Pennes bio‐heat equation, temperature–time dependent model, and cell death model, respectively. Temperature‐dependent blood velocity is modeled using the Navier–Stokes equation, and the fluid–solid interaction boundary is treated as a convective boundary. For discretization, we utilized elements for the wave propagation model, elements for the Pennes bio‐heat model, and elements for the Navier–Stokes equation, where represents the computational domain. The simulated results show that blood vessels and blood velocity have a significant impact on temperature distribution, tissue contraction, and the volume of the ablation zone.

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“…The limits of the electromagnetic field (EMF) take into account the presence of direct and indirect health effects. They refer to exposure regardless of its duration and include the effects of both short-term and long-term exposure [3,4].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Training Aircraft Crew Exposure to Electromagnetic Fields Caused by Radio Navigation Devices

et al. 2021

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The paper depicts research concerning the value of the electric component of the electromagnetic (EM) energy determined by the NHT3DL meter by Microrad with the 01E measuring probe during a number of flights made by Aero AT-3 R100, Cessna C172, and Tecnam P2006T fixed wing aircrafts and a Robinson R44 Raven helicopter. The point of reference for the recorded measurement was the normative limits of the electromagnetic field (EMF), which can influence a pilot in the course of a flight. Selected studies of the maximum value recorded by the meter was E = 10.66 V/m when landing at an airfield equipped with the VHF (Very High Frequency) omnidirectional radio range (VOR) approach system. Particular attention has been paid to changes in electric field intensity during the operation and their effects on the type of radio navigation systems as well as communication with the airfield control tower. The obtained results were validated in the Statistica 13.3 software for the purpose of a detailed stochastic analysis of the tested values. Results obtained are subject to the mandatory requirements of Directive 2013/35/EU as well as to the relevant regulations in Poland.

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Modelling the temperature-dependent RF ablation produced by the multi-tine electrode

Cited by 4 publications

References 17 publications

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

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

Effect of high blood flow on heat distribution and ablation zone during microwave ablation‐numerical approach

Assessment of Training Aircraft Crew Exposure to Electromagnetic Fields Caused by Radio Navigation Devices

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