Exploration of Whole Human Body and UWB Radiation Interaction by Efficient and Accurate Two-Debye-Pole Tissue Models

Fujii, M.; Fujii, Ryo; Yotsuki, Reo; Tuya, Wuren; Takai, Taro; Iwata, Shuichi

doi:10.1109/tap.2009.2024968

Cited by 23 publications

(9 citation statements)

References 10 publications

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“…The n-pole Debye dispersion model of e(ω) proposed by Fujii et al [12,13] at a given angular frequency ω with a conductive loss term is as follows…”

Section: N-pole Debye Dispersion Model Of D Vmentioning

confidence: 99%

“…These models assume the propagation medium as homogeneous bodies separated by homogeneous films discarding the continuous inhomogeneity. ε′ and

ϵ^{normal′ normal′}

of the GI tract wall tissues ( D v1 ), have been compiled and modelled by 4‐pole Cole–Cole equations [10, 11] and further simplified to a 2‐pole Debye dispersion model [12, 13]. Firstly, these models only include a conductive loss term to capture the effect of single‐layer medium on energy absorption.…”

Section: Introductionmentioning

confidence: 99%

“…In Section 2, we briefly describe the experimental setup of this Letter. In Section 3, we present the performance of the 2-pole Debye dispersion model of [12,13] tested on our measured D v1 . In Section 4, we derive an analytical model of D s using multilayer dielectric slabs by calculating the incident and reflected fields at each interface.…”

mentioning

confidence: 99%

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In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

Nadimi

Blanes-Vidal

Harslund

et al. 2015

Healthcare Technology Letters

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Radio frequency tracking of medical micro-robots in minimally invasive medicine is usually investigated upon the assumption that the human body is a homogeneous propagation medium. In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity e in terms of refraction e′, absorption e″ and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under in vivo and in situ conditions. They further investigated the effects of irregular and unsynchronised contractions and simulated peristaltic movements of the GI tract organs inside the abdominal cavity and in the presence of the abdominal wall on the measurements and variations of e′ and e′′. They advanced the previous models of effective complex permittivity of a multilayer inhomogeneous medium, by estimating an analytical model that accounts for reflections between the layers and calculates the attenuation that the wave encounters as it traverses the GI tract and the abdominal wall. They observed that deviation from the specified nominal layer thicknesses due to non-geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors' model. Therefore, they derived statistical-based models for e′ and e′′ using their experimental measurements.

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“…The n-pole Debye dispersion model of e(ω) proposed by Fujii et al [12,13] at a given angular frequency ω with a conductive loss term is as follows…”

Section: N-pole Debye Dispersion Model Of D Vmentioning

confidence: 99%

“…These models assume the propagation medium as homogeneous bodies separated by homogeneous films discarding the continuous inhomogeneity. ε′ and

ϵ^{normal′ normal′}

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

Nadimi

Blanes-Vidal

Harslund

et al. 2015

Healthcare Technology Letters

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“…Gabriel's Cole-Cole model is reduced to a two-pole Debye model by using the least squares fitting technique in [8,9]. The two-pole Debye tissue model is more suitable for the time domain methods but is less accurate than the Cole-Cole model.…”

Section: Introductionmentioning

confidence: 99%

Modeling Human Body Using Four-Pole Debye Model in Piecewise Linear Recursive Convolution FDTD Method for the SAR Calculation in the Case of Vehicular Antenna

Guellab

2018

International Journal of Antennas and Propagation

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We propose an efficient finite difference time domain (FDTD) method based on the piecewise linear recursive convolution (PLRC) technique to evaluate the human body exposure to electromagnetic (EM) radiation. The source of radiation considered in this study is a high-power antenna, mounted on a military vehicle, covering a broad band of frequency (100 MHz–3 GHz). The simulation is carried out using a nonhomogeneous human body model which takes into consideration most of the internal body tissues. The human tissues are modeled by a four-pole Debye model which is derived from experimental data by using particle swarm optimization (PSO). The human exposure to EM radiation is evaluated by computing the local and whole-body average specific absorption rate (SAR) for each occupant. The higher in-tissue electric field intensity points are localized, and the SAR values are compared with the crew safety standard recommendations. The accuracy of the proposed PLRC-FDTD approach and the matching of the Debye model with the experimental data are verified in this study.

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“…However, the implementation of the Cole-Cole model using the FDTD method is difficult because of the fractional order differentiators in this model. In some studies, least squares fitting technique has been applied to reduce Gabriel's 4-pole Cole-Cole equations to simpler 2-pole Debye equations [13][14][15]. In [16], a new FDTD formulation is presented for the modeling of electromagnetic wave propagation in dispersive biological tissues with the Cole-Cole model and the Z-transform is used to represent the frequency dependent dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional FDTD Analysis of the Dual-Band Implantable Antenna for Continuous Glucose Monitoring

Hojjat-Kashani

2012

PIER Letters

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Abstract-The finite difference time domain (FDTD) method is widely used as a computational tool to simulate the electromagnetic wave propagation in biological tissues. When expressed in terms of Debye parameters, dispersive biological tissues dielectric properties can be efficiently incorporated into FDTD codes. In this paper, FDTD formulation with nonuniform grid is presented to simulate a dual medical implant communications service (MICS) (402-405 MHz) and industrial, scientific, and medical (ISM) (2.4-2.48 GHz) band implantable antenna for continuous glucose-monitoring applications. In addition, we present computationally simpler two-pole Debye models that retain the high accuracy of the Cole-Cole Model for dry skin in MICS and ISM bands. The reflection coefficient simulation result with Debye dispersion is presented and compared with the published results. FDTD was also applied to analyze antenna's farfield.

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Exploration of Whole Human Body and UWB Radiation Interaction by Efficient and Accurate Two-Debye-Pole Tissue Models

Cited by 23 publications

References 10 publications

In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

Modeling Human Body Using Four-Pole Debye Model in Piecewise Linear Recursive Convolution FDTD Method for the SAR Calculation in the Case of Vehicular Antenna

Three-Dimensional FDTD Analysis of the Dual-Band Implantable Antenna for Continuous Glucose Monitoring

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