Multiphase System of Coils as Illustrated by Magnetotherapy

Syrek, P.; Skowron, Mikołaj; Cieśla, A.

doi:10.1109/atee.2019.8724931

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…The study in [17] is based on the analytical approach featuring the disk model of the human body, while most often the numerical approach is based on the use of the finite-difference time-domain method [18,19]. In many numerical analyses, the main focus when calculating the induced eddy current distribution is restricted to a particular body part, such as a knee joint [18,19,21] or a forearm [22]. The full human body model exposure during the magnetotherapy procedure is used to a lesser extent, as evidenced from the available literature [17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Magnetotherapy Device-Induced Fields Using Cylindrical Human Body Model

Cvetković,

Sučić

2024

Electronics

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This paper deals with the analysis of induced current density and the induced electric field in the body of a human exposed to the magnetic field of a magnetotherapy device. As the displacement currents at extremely low frequencies can be neglected, the biological tissues can thus be considered a weakly conducting medium, facilitating the use of a quasi-static eddy current approximation. The formulation is based on the surface integral equation for the unknown surface charges, whose numerical solution is obtained using the method of moments technique. A simplified model of the human body is utilized to examine various scenarios during the magnetotherapy procedure. The numerical results for the induced current density and the induced electric field are obtained using the proposed model. The analyses of various stimulating coil parameters, human body model parameters, and a displacement of the magnetotherapy coil were carried out to assess their effects on the induced current density. The results suggest that selection of the stimulating coil should be matched based on the size of the human body, but also that the position and orientation of the coil with respect to the body surface will result in different distributions of the induced fields. The results of this study could be useful for medical professionals by showing the importance of various magnetotherapy coil parameters for preparation of various treatment scenarios.

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Section: Introductionmentioning

confidence: 99%

Analysis of Magnetotherapy Device-Induced Fields Using Cylindrical Human Body Model

Cvetković,

Sučić

2024

Electronics

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“…An example of the medical usage of phased array antennas would be the BSD-2000 hyperthermia system including Sigma-Eye applicators produced by the BSD Medical Corporation [ 24 ]. The matrices of various antennas and coils are commonly employed in treating other disorders [ 25 , 26 ]. It is also possible to use interstitial applicators, inserted into the cancer tissue, but their percutaneous application is not always possible for medical reasons.…”

Section: Introductionmentioning

confidence: 99%

In Silico Study on Tumor-Size-Dependent Thermal Profiles inside an Anthropomorphic Female Breast Phantom Subjected to Multi-Dipole Antenna Array

Gas

Miaskowski

Subramanian

2020

IJMS

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Electromagnetic hyperthermia as a potent adjuvant for conventional cancer therapies can be considered valuable in modern oncology, as its task is to thermally destroy cancer cells exposed to high-frequency electromagnetic fields. Hyperthermia treatment planning based on computer in silico simulations has the potential to improve the localized heating of breast tissues through the use of the phased-array dipole applicators. Herein, we intended to improve our understanding of temperature estimation in an anatomically accurate female breast phantom embedded with a tumor, particularly when it is exposed to an eight-element dipole antenna matrix surrounding the breast tissues. The Maxwell equations coupled with the modified Pennes’ bioheat equation was solved in the modelled breast tissues using the finite-difference time-domain (FDTD) engine. The microwave (MW) applicators around the object were modelled with shortened half-wavelength dipole antennas operating at the same 1 GHz frequency, but with different input power and phases for the dipole sources. The total input power of an eight-dipole antenna matrix was set at 8 W so that the temperature in the breast tumor did not exceed 42 °C. Finding the optimal setting for each dipole antenna from the matrix was our primary objective. Such a procedure should form the basis of any successful hyperthermia treatment planning. We applied the algorithm of multi for multi-objective optimization for the power and phases for the dipole sources in terms of maximizing the specific absorption rate (SAR) parameter inside the breast tumor while minimizing this parameter in the healthy tissues. Electro-thermal simulations were performed for tumors of different radii to confirm the reliable operation of the given optimization procedure. In the next step, thermal profiles for tumors of various sizes were calculated for the optimal parameters of dipole sources. The computed results showed that larger tumors heated better than smaller tumors; however, the procedure worked well regardless of the tumor size. This verifies the effectiveness of the applied optimization method, regardless of the various stages of breast tumor development.

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Multiphase System of Coils as Illustrated by Magnetotherapy

Cited by 2 publications

References 17 publications

Analysis of Magnetotherapy Device-Induced Fields Using Cylindrical Human Body Model

Analysis of Magnetotherapy Device-Induced Fields Using Cylindrical Human Body Model

In Silico Study on Tumor-Size-Dependent Thermal Profiles inside an Anthropomorphic Female Breast Phantom Subjected to Multi-Dipole Antenna Array

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