Ablation probes

Ashour, Amira S.; Guo, Yanhui; Mohamed, Waleed S.

doi:10.1016/b978-0-12-819544-4.00003-4

Cited by 2 publications

(1 citation statement)

References 141 publications

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“…Since the wavelength λ=c/(fn) is much larger than the size of pig skin samples at 4 MHz, where c=3×10 8 m/s is the speed of light, f is the frequency (Hz), rr n=  is the refractivity in pig skin, μr=1 33 is the relative magnetic permeability, εr is the relative dielectric constant. Thus, a quasi-static approximation was employed to resolve the electric field problem.…”

Section: Studymentioning

confidence: 99%

Selective and Controllable Mechanism of the Temperature Field in Pig Skin under Radiofrequency Heating

Zhu,

Xie,

Shu

et al. 2024

Preprint

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Radiofrequency heating is widely used in medical aesthetics, which essentially achieves the contraction of collagen fibers in the dermis by increasing its temperature. The paper aimed to study the selective and controllable mechanism for the temperature field in 0.02 kg ex-vivo pig skin samples obtained from the 25 kg Bama pig under radiofrequency heating by the finite element method and relevant experiments. A heating model of pig skin was constructed at 4 MHz with a mixed heating mode of fixed-point and reciprocating sliding. Based on the mixed heating, the dermis was heated preferentially and uniformly due to its high electrical conductivity and thermal conductivity compared to other tissue layers. It allowed the dermis temperature 55.1 ℃ to remain at a dynamic plateau period with an error of 0.1 ℃, and the mean specific absorption rate across the entire pig was under 2 W/kg within 30 s in this period. The verification experiment on the pig skin samples under the same conditions showed consistent temperature distributions between the model and experiment, and the dermis collagen fibers structure was clear without tissue damage. The research results provide useful guidance for radiofrequency application practitioners to selectively control skin temperature distributions.

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Section: Studymentioning

confidence: 99%

Selective and Controllable Mechanism of the Temperature Field in Pig Skin under Radiofrequency Heating

Zhu,

Xie,

Shu

et al. 2024

Preprint

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Numerical Estimation of SAR and Temperature Distributions inside Differently Shaped Female Breast Tumors during Radio-Frequency Ablation

Miaskowski

Gas

2022

Materials

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Radio-frequency (RF) ablation is a reliable technique for the treatment of deep-seated malignant tumors, including breast carcinoma, using high ablative temperatures. The paper aims at a comparative analysis of the specific absorption rate and temperature distribution during RF ablation with regard to different female breast tumors. In the study, four tumor models equivalent to an irregular tumor were considered, i.e., an equivalent sphere and ellipsoid with the same surfaces and volumes as the irregular tumor and an equivalent sphere and ellipsoid inscribed in the irregular tumor. An RF applicator with a specific voltage, operating at 100 kHz inserted into the anatomically correct female breast, was applied as a source of electromagnetically induced heat. A conjugated Laplace equation with the modified Pennes equation was used to obtain the appropriate temperature gradient in the treated area. The levels of power dissipation in terms of the specific absorption rate (SAR) inside the naturalistically shaped tumor, together with the temperature profiles of the four simplified tumor models equivalent to the irregular one, were determined. It was suggested that the equivalent tumor models might successfully replace a real, irregularly shaped tumor, and the presented numeric methodology may play an important role in the complex therapeutic RF ablation process of irregularly shaped female breast tumors.

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Ablation probes

Cited by 2 publications

References 141 publications

Selective and Controllable Mechanism of the Temperature Field in Pig Skin under Radiofrequency Heating

Selective and Controllable Mechanism of the Temperature Field in Pig Skin under Radiofrequency Heating

Numerical Estimation of SAR and Temperature Distributions inside Differently Shaped Female Breast Tumors during Radio-Frequency Ablation

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