Modeling of various kinds of applicators used for microwave hyperthermia based on the FDTD method

Camart, J.C.; Despretz, D.; Chive, M.; Pribetich, J.

doi:10.1109/22.539939

Cited by 22 publications

(5 citation statements)

References 17 publications

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“…The reported FDTD based scalar formulations proved inadequate for the analysis of hybrid mode propagation in cardiac and hepatic radio-frequency (RF) ablation problems [13]. Futhermore, the inherent convergence issues and intense computational exercise involved are quite challenging and require a suitable alternative.…”

Section: Introductionmentioning

confidence: 99%

Design, development and microwave inter-comparison of dual slot antenna configurations for localized hepatic tumor management

Zafar¹,

Zafar²,

Zafar

et al. 2015

Australas Phys Eng Sci Med

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Slot antennas are generally preferred for localized liver cancer treatment modalities due to desired radiation characteristics. An iterative thermal/microwave numerical routine is used to analyze regular and miniature slot antenna configurations at 5.8 GHz. A thermal/microwave solver determines the specific absorption rate to malignant tissues as a pre- processing step to compute microwave solution in terms of propagation wave number, return loss and insertion loss. The regular and miniature dual slots antenna geometries were then developed to estimate the return loss characteristics against antennas slot lengths at a constant frequency of 5.8 GHz. Results reveal that the regular geometry has return loss less than -5 dB as compared to <-25 dB return loss for miniature slot antenna configuration. Furthermore, 5.8 GHz antenna geometry provides physical size reduction up to 50 %, lower fabrication cost and is a better minimally invasive choice due to further packed thermal ablation spots.

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Section: Introductionmentioning

confidence: 99%

Design, development and microwave inter-comparison of dual slot antenna configurations for localized hepatic tumor management

Zafar¹,

Zafar²,

Zafar

et al. 2015

Australas Phys Eng Sci Med

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“…Most of them are essentially constituted of an insulated monopole, dipole or helix feed through a thin coaxial cables. However several technical solutions (Turner, 1986;Tumeh and Iskander, 1989;Camart et al, 1996;Lin and Wang, 1987;Cerri et al;1993;Saito et al, 2000) have been proposed in order to localize the heating in a restrict area of tissue around the tumour and to avoid accidental and unwanted hot spots in the healthy tissue.…”

Section: Introductionmentioning

confidence: 99%

A Minimally Invasive Microwave Hyperthermic Applicator With an Integrated Temperature Sensor

Gentili¹,

Linari²

2008

Proceedings of the First International Conference on Biomedical Electronics and Devices

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In the field of microwave hyperthermia and thermo-ablation, the use of minimally invasive applicators is recognized as a very promising means for the treatment of small, early stage, cancer lesions because a very thin applicator can be easily introduced inside the body and precisely directed towards a deep seated tumour using the most advanced 3D imaging techniques and surgical stereo-navigation. Minimally invasive applicators have been successfully employed for the treatment of bladder carcinoma and brain tumours but the accurate temperature monitoring of the heated tissue volume still remains an open problem. In this paper we propose a new minimally invasive applicator, integrating a low-cost metallic wired temperature sensor. The miniaturised endocavitary applicator consists of a asymmetric isolated dipole operating at 2.45 GHz. The very slim shape of the applicator allows to easily insert it into the lesion through a soft plastic tube (catheter) while a temperature sensor, properly embedded in the applicator body, measures the tissue temperature at the interface with the catheter surface. An electromagnetic analysis based on the Finite Integration Technique (FIT) and experimental verifications over a tissue sample proved that a coaxial choke, enclosing the temperature sensor wires, allows localize the heating pattern in a restrict volume while drastically reducing measuring artefacts due to the perturbing effects induced by the probe leads.

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“…The first of these, the finite-difference time-domain (FDTD) method, is based on the Yee algorithm [ 12 ] and uses finite difference approximations of the time and space derivatives of Maxwell's curl equations to create a discrete three-dimensional representation of the electric and magnetic fields. This method has been widely used to numerically evaluate the electromagnetic radiation patterns of antennas in tissue [ 13 - 17 ], although long computation times are generally required. Another commonly used CEM technique is method of moments (MoM) [ 18 , 19 ], in which approximate numerical solutions to integral equations are formulated in the frequency domain to determine an unknown current distribution for an antenna.…”

Section: Introductionmentioning

confidence: 99%

Antenna design for microwave hepatic ablation using an axisymmetric electromagnetic model

et al. 2006

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Modeling of various kinds of applicators used for microwave hyperthermia based on the FDTD method

Cited by 22 publications

References 17 publications

Design, development and microwave inter-comparison of dual slot antenna configurations for localized hepatic tumor management

Design, development and microwave inter-comparison of dual slot antenna configurations for localized hepatic tumor management

A Minimally Invasive Microwave Hyperthermic Applicator With an Integrated Temperature Sensor

Antenna design for microwave hepatic ablation using an axisymmetric electromagnetic model

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