Microwave Diathermy for Deep Heating Therapy of Knee Joint

Farahat, Asmaa E.; Kahil, Heba Mohamed; Hussein, and Khalid Fawzy Ahmed

doi:10.2528/pierc19110604

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The electro-thermal interaction of female breast tissues affected by the tumor with microwaves produced by a circular array of dipole antennas was solved using the finite-difference time-domain (FDTD) engine relying on the Maxwell’s equations in a time domain, as described in [ 17 ]. Details of the FDTD paradigm based on the cubic cells can be found in several critical studies [ 20 , 25 , 65 ].…”

Section: Methodsmentioning

confidence: 99%

“…Importantly, the SAR value is reflected in the increase in temperature distribution for the breast tissue T (K), as shown in the modified Pennes equation (Equation (1)). Therefore, the measurement and monitoring of this parameter may play an important role in terms of establishing EM hazards and human tissue safety [ 25 , 68 , 69 , 70 ].…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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Section: Methodsmentioning

confidence: 99%