Characterization of Microwave's Antennas for Intracardiac Ablation Frequencies 915 and 2450 MHz

Rouane, Amar; Kourtiche, Djilali

doi:10.2478/v10048-012-0006-9

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…The HF current is produced by a low power 0.5-2 W generator that emits a sinusoidal waveform signal at 27.12 MHz. We used a unipolar 7F probe with a 5 mm electrode delivering 100 Watts of power with little energy loss [24][25][26]. The HF current is delivered by a 5 mm electrode to a large plate on the subject's back.…”

Section: Methodsmentioning

confidence: 99%

High frequency metrology for intracardiac ablation: in-vivo results

Rouane

Bru²

2012

Metrology and Measurement Systems

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Cardiac Radiofrequency (RF) ablation is a commonly used clinical procedure for treating many cardiac arrhythmias. However, the efficacy of RF ablation may be limited by two factors: small ventricular lesions and impedance rise, leading to coagulum formation and desiccation of tissue. In this paper, a high frequency (HF) energy ablation system operating at 27.12 MHz based on an automated load matching system was developed. A HF energy matched probe associated to the automated impedance matching device ensures optimal transfer of the energy to the load. The aim of this study was to evaluate this energy for catheter ablation of the atrioventricular junction. In vivo studies were performed using 10 sheep to characterize the lesions created with the impedance matching system. No cardiac perforation was noted. No thrombus was observed at the catheter tip. Acute lesions ranged from 3 to 45 mm in diameter (mean ±SD = 10.3±10) and from 1 to 15 mm in depth (6.7±3.9), exhibiting a close relationship between HF delivered power level and lesion size. Catheter ablation using HF current is feasible and appears effective in producing a stable AV block when applied at the AV junction and large myocardial lesions at ventricular sites.

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Section: Methodsmentioning

confidence: 99%

High frequency metrology for intracardiac ablation: in-vivo results

Rouane

Bru²

2012

Metrology and Measurement Systems

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“…There are various sources of uncertainty and variation in this kind of combined FDTD and temperature simulations [5][6][7][8][9][10][11][12][13][14][15][16]. Usually, the rise in temperature has been small so thermoregulatory response has been ignored, which may have led to overestimation.…”

Section: Introductionmentioning

confidence: 99%

A New Design of Metamaterials for SAR Reduction

Faruque¹,

Islam²,

Ali³

2013

Measurement Science Review

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The purpose of this paper is to calculate the reduction of specific absorption rate (SAR) with a new design of square metamaterials (SMMs). The finite-difference time-domain (FDTD) method with lossy-Drude model is adopted in this analysis. The method of SAR reduction is discussed and the effects of location, distance, and size of metamaterials are analyzed. SMMs have achieved a 53.06% reduction of the initial SAR value for the case of 10 gm SAR. These results put forward a guideline to select various types of metamaterials with the maximum SAR reducing effect for a cellular phone.

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“…Thus, the technique is only suitable for subsurface measurement of moisture of a thin layer of latex due to its low electromagnetic field penetration depth. However, the penetration depth could be resolved probably by using a more dedicated instrument, such as TROTEC T600 Material Moisture Meter [11] enabling penetration to depths about 30 cm. Nevertheless, it should also be noted that the maximum penetration depth is significantly reduced if the material that is to be measured is M 10.2478/v10048-012-0034-5 intensely saturated with moisture in the region near the surface.…”

Section: Introductionmentioning

confidence: 99%

A Simple Insulated Monopole Sensor Technique for Determination of Moisture Content in Hevea Rubber Latex

Ansarudin¹,

Abbas²,

Hassan³

et al. 2012

Measurement Science Review

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This paper describes the application of a SMA stub contact panel as an insulated monopole sensor for determination of moisture content in hevea rubber latex. Comparison results between measured and calculated reflection coefficient using King's model are presented. Calibration equations relating moisture content to phase shift have been established in the frequency range from 100 MHz to 5 GHz. The accuracy of the technique was 1.3% when compared to actual moisture content obtained using the gravimetric method.

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Characterization of Microwave's Antennas for Intracardiac Ablation Frequencies 915 and 2450 MHz

Cited by 4 publications

References 17 publications

High frequency metrology for intracardiac ablation: in-vivo results

High frequency metrology for intracardiac ablation: in-vivo results

A New Design of Metamaterials for SAR Reduction

A Simple Insulated Monopole Sensor Technique for Determination of Moisture Content in Hevea Rubber Latex

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