An FDTD algorithm for transient propagation in biological tissue with a Cole-Cole dispersion relation

Schuster, J.; Luebbers, R.

doi:10.1109/aps.1998.701597

Cited by 35 publications

(24 citation statements)

References 4 publications

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“…The finite-difference time-domain (FDTD) method [3] is commonly used for computational investigations of such modalities. The overall accuracy of FDTD simulations of wideband microwave interactions with breast tissue is prescribed in part by the accuracy of the model used to capture the relaxation-based Manuscript [3], [4] to the Cole-Cole model that is more computationally complex [5], [6].…”

mentioning

confidence: 99%

Highly Accurate Debye Models for Normal and Malignant Breast Tissue Dielectric Properties at Microwave Frequencies

Lazebnik

Okoniewski

Booske

et al. 2007

IEEE Microw. Wireless Compon. Lett.

235

149

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The finite difference time domain (FDTD) method is widely used as a computational tool for development, validation, and optimization of emerging microwave breast cancer detection and treatment techniques. When expressed in terms of Debye parameters, dispersive breast tissue dielectric properties can be efficiently incorporated into FDTD codes. Previously, we experimentally characterized the dielectric properties of a large number of excised normal and malignant breast tissue samples from 0.5 to 20 GHz. We subdivided the large database of normal tissue data into three groups based on the percent adipose tissue present in a particular sample. In addition, we formed a group of all cancer samples that contained at least 30% malignant tissue. We summarized the data using one-pole Cole-Cole models that were rigorously fit to the median dielectric properties of the three normal tissue groups and one malignant tissue group. In this letter, we present computationally simpler one-and two-pole Debye models that retain the high accuracy of the Cole-Cole models. Model parameters are derived for two sets of frequency ranges: the entire measurement frequency range from 0.5 to 20 GHz, and the 3.1-10.6 GHz FCC band allocated for ultrawideband medical applications. The proposed Debye models provide a means for creating computationally efficient FDTD breast models with realistic wideband dielectric properties derived from the largest and most comprehensive experimental study conducted to date on human breast tissue.Index Terms-Breast cancer detection and treatment, Cole-Cole model, Debye model, dielectric properties, finite-difference timedomain (FDTD).

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mentioning

confidence: 99%

Highly Accurate Debye Models for Normal and Malignant Breast Tissue Dielectric Properties at Microwave Frequencies

Lazebnik

Okoniewski

Booske

et al. 2007

IEEE Microw. Wireless Compon. Lett.

235

149

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“…The implementation of Cole-Cole model in FDTD is difficult because of the fractional order differentiators in the model [3], [7]. In [7], the authors transformed the Cole-Cole dispersion relation into the time domain which involves a convolution integral, and approximated the convolution integral by a decaying exponential series.…”

Section: Introductionmentioning

confidence: 99%

“…In [7], the authors transformed the Cole-Cole dispersion relation into the time domain which involves a convolution integral, and approximated the convolution integral by a decaying exponential series. The method is complex because it considers the time domain convolution integral directly.…”

Section: Introductionmentioning

confidence: 99%

A New FDTD Formulation for Wave Propagation in Biological Media With Cole–Cole Model

Guo

Zmuda

2006

IEEE Microw. Wireless Compon. Lett.

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The finite-difference time-domain (FDTD) method has been widely used to simulate the electromagnetic wave propagation in biological tissues. The Cole-Cole model is a formulation which can describe many types of biological tissues accurately over a very wide frequency band. However, the implementation of the Cole-Cole model using the FDTD method is difficult because of the fractional order differentiators in the model. In this letter, a new FDTD formulation is presented for the modeling of electromagnetic wave propagation in dispersive biological tissues with the Cole-Cole model. The -transform is used to represent the frequency dependent dielectric properties. The fractional order differentiators in the Cole-Cole model is approximated by a polynomial. The coefficients of the polynomial are found using a least-squares fitting method. Index Terms-Cole-Cole model, finite-difference time-domain (FDTD) methods, least-squares (LS) fitting method, -transform.

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“…Antennas are crucial parts of these telemetric systems because they supply communication between the patient and the external environment. Implantable antennas have recently been getting extensive interest in several wireless data telemetry applications such as cardiac pacemakers, brain pacemakers, nerve signal recorders, artificial eyes, cochlear implants, implantable drug pumps, and glucose sensors with the developments in telecommunications and telemedicine (5)(6)(7)(8). However, designing antennas for implantable telemetric systems is a quite challenging problem for researchers because of impedance matching, biocompatibility, low power requirements, antenna miniaturization, and high losses in the tissue.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Human Skin-Mimicking Gels for in Vitro Measurements of the Dual-Band Medical Implant Antenna

Doğancı

Uçar

Sondaş

2016

J. Turk. Chem. Soc., Sect. A: Chem.

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Abstract:The purposes of this study are to design a small size implantable antenna and to present a complementary recipe for a human skin-mimicking material for in vitro testing of implantable antennas operating at MICS (Medical Implant Communications Service, 402-405 MHz) and ISM (Industrial, Scientific and Medical, 2.4 GHz-2.48 GHz) bands. Approximate electrical properties of human tissues at MICS and ISM bands were obtained by mixing deionized water, sucrose, sodium chloride (NaCl), and poly(acrylic acid) (PAA or Carbomer) with different content percentages. To test the antenna in vitro, skin mimicking gels were made that to show electrical properties real skin tissue (relative permittivity (εr) and conductivity (σ)) for the operation frequencies of ISM and MICS bands. For the antenna performance evaluations the measurements of the antenna (return loss (S11)) have been performed by placing in to the skin mimicking gels. The measurements were taken in the 1 GHz -5 GHz frequency band. The measurement and simulation results are quite good agreement except some discrepancy in S11 levels and frequency bands.

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An FDTD algorithm for transient propagation in biological tissue with a Cole-Cole dispersion relation

Cited by 35 publications

References 4 publications

Highly Accurate Debye Models for Normal and Malignant Breast Tissue Dielectric Properties at Microwave Frequencies

Highly Accurate Debye Models for Normal and Malignant Breast Tissue Dielectric Properties at Microwave Frequencies

A New FDTD Formulation for Wave Propagation in Biological Media With Cole–Cole Model

Preparation of a Human Skin-Mimicking Gels for in Vitro Measurements of the Dual-Band Medical Implant Antenna

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