The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues

Gabriel, Sami; Lau, R W M; Gabriel, Camelia

doi:10.1088/0031-9155/41/11/003

Cited by 3,518 publications

(2,556 citation statements)

References 7 publications

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“…aThe permittivity (conductivity) ratio is (permittivity (conductivity) of newborn tissue)/( permittivity (conductivity) of adult tissue) at 130 MHz as reported by Peyman et al 18.bNewborn tissue permittivity (conductivity) values are the adult values (from References 20, 21, 22) multiplied by the appropriate ratio.cDensity values provided by Helmholtz Zentrum München.…”

Section: Methodsmentioning

confidence: 99%

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Specific absorption rate in neonates undergoing magnetic resonance procedures at 1.5 T and 3 T

et al. 2015

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MRI is finding increased clinical use in neonatal populations; the extent to which electromagnetic models used for quantification of specific absorption rate (SAR) by commercial MRI scanners accurately reflect this alternative scenario is unclear. This study investigates how SAR predictions relating to adults can be related to neonates under differing conditions when imaged using 1.5 T and 3 T MRI scanners. Electromagnetic simulations were produced in neonatal subjects of different sizes and positions within a generic MRI body transmit device operating at both 64 MHz and 128 MHz, corresponding to 1.5 T and 3 T MRI scanners, respectively. An adult model was also simulated, as was a spherical salt‐water phantom, which was also used in a calorimetry experiment. The SAR in neonatal subjects was found to be less than that experienced in an adult in all scenarios; however, the overestimation factor was variable. For example a 3 T body scan resulting in local 10 g SAR of 10.1 W kg−1 in an adult would deposit 2.6 W kg−1 in a neonate: an approximately fourfold difference. The SAR experienced by neonatal subjects undergoing MRI is lower than that in adults in equivalent situations. If the safety of such procedures is assessed using adult‐appropriate models then the result is a conservative estimate. © 2015 The Authors. NMR in Biomedicine published by John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

“…Newborn tissue permittivity (conductivity) values are the adult values (from References 20, 21, 22) multiplied by the appropriate ratio.…”

Section: Methodsmentioning

confidence: 99%

Specific absorption rate in neonates undergoing magnetic resonance procedures at 1.5 T and 3 T

et al. 2015

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“…For simulation, the frequency dependent skin permittivity and conductivity values were obtained from databases [20]. The dispersion curves of fat and glandular were calculated according to Eqs.…”

Section: Fidelity and Signal Distortionmentioning

confidence: 99%

Simulation Design and Testing of a Dielectric Embedded Tapered Slot Uwb Antenna for Breast Cancer Detection

Al-Zuhairi¹,

Gahl²,

Al-Azzawi³

et al. 2017

PIER C

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Abstract-A distortion-less ultra-wideband tapered slot antenna is designed to achieve wide band impedance matching and high gain without requiring coupling liquids. The antenna is embedded in a suitable dielectric material for compact size and performance improvement. The near-field test is simulated by placing several field probes near the antenna to plot the radiation pattern and polarization isolation. The antenna exhibits a highly directive pattern and polarization isolation in near field. The time domain antenna distortion is tested by calculating the fidelity and group delay. The results show low distortion and also show the importance of covering the antenna by dielectric layers for bandwidth increment and distortion reduction. To evaluate the antenna performance in breast cancer detection, three breast phantoms are imaged by using the raster scan imaging method. Two approaches are proposed to detect tumors without the need of breast background data. The approaches based on the effect of the tumor on transmission and reflection parameters on the frequency band allowed for medical applications. The obtained images show the antenna to be a strong candidate for breast imaging as well as in tumor detection for different scenarios that include complex multi-layer phantom and small tumor.

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“…When α n is zero, the Cole-Cole model reduces to the Debby model for polar dielectrics and when α n is one, it describes when the locus of the dielectric constant in the complex plane has a circular arc whose end points are on the axis of the real part and the centre lying below the axis as shown in Figure 2. The Cole-Cole parameter has been widely used for obtaining the dielectric properties of biological tissues because it can estimate the dielectric properties from zero frequency to infinite frequency [39,40]. However, the model uses interpolated data from a least squares regression.…”

Section: Electrical Property Of Human Tissuesmentioning

confidence: 99%

A Review on Opportunities To Assess Hydration in Wireless Body Area Networks

Asogwa

Lai

2017

Electronics

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Abstract:The study of human body hydration is increasingly leading to new practical applications, including online assessment techniques for whole body water level and novel techniques for real time assessment methods as well as characterization for fitness and exercise performance. In this review, we will discuss the different techniques for assessing hydration from electrical properties of tissues and their components and the biological relations between tissues. This will be done mainly in the context of engineering while highlighting some applications in medicine, mobile health and sports.

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The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues

Cited by 3,518 publications

References 7 publications

Specific absorption rate in neonates undergoing magnetic resonance procedures at 1.5 T and 3 T

Specific absorption rate in neonates undergoing magnetic resonance procedures at 1.5 T and 3 T

Simulation Design and Testing of a Dielectric Embedded Tapered Slot Uwb Antenna for Breast Cancer Detection

A Review on Opportunities To Assess Hydration in Wireless Body Area Networks

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