A Theoretical Model for the Frequency-Dependent Dielectric Properties of Corneal Tissue at Microwave Frequencies

Saviz, Mehrdad; Faraji‐Dana, Reza

doi:10.2528/pier12112510

Cited by 9 publications

(5 citation statements)

References 42 publications

(50 reference statements)

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“…Secondly, others perform their own measurements according to their requirements [110]. Finally, some researchers estimate theoretically the relative permittivity, taking into account the tissue constituents [111].…”

Section: B a Experimental Tissue-equivalent Phantomsmentioning

confidence: 99%

Ultrawideband Technology for Medical In-Body Sensor Networks: An Overview of the Human Body as a Propagation Medium, Phantoms, and Approaches for Propagation Analysis

Garcia-Pardo

Andreu

Fornés-Leal

et al. 2018

IEEE Antennas Propag. Mag.

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In-body sensor networks are those networks where at least one of the sensors is located inside the human body. Such wireless in-body sensors are mainly used for medical applications, collecting and monitoring important parameters for health and diseases treatment. The IEEE Standard 802.15.6-2012 for Wireless Body Area Networks (WBAN) considers in-body communications in the Medical Implant Communication Service (MICS) band. Nevertheless, high data rate communications are not feasible at the MICS band due to its narrow occupied bandwidth. In this framework, Ultra-Wideband (UWB) systems have emerged as a potential solution for in-body high data rate communications, due to its miniaturization capabilities or low power consumption. In the last years, some open issues have determined the research about in-body propagation. Firstly, the propagation medium, i.e., the human body tissues, is frequencydependent and exhibits a large attenuation at UWB frequencies. Secondly, the behavior of the in-body antennas is highly dominated by the surrounding tissues. Thus, the in-body channel characterization in UWB depends not only on the channel behavior itself, but also on the methodology of characterization. This paper intends to outline the research performed in the field of UWB in-body radio channel characterization considering the propagation medium, as well as the methodology of analysissoftware simulations, phantom measurements, in vivo measurements-. Thus, authors provide an overall perspective of the current state of the art, limitations for the analysis of in-body propagation, and future perspectives for UWB in-body channel analysis.

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Section: B a Experimental Tissue-equivalent Phantomsmentioning

confidence: 99%

Ultrawideband Technology for Medical In-Body Sensor Networks: An Overview of the Human Body as a Propagation Medium, Phantoms, and Approaches for Propagation Analysis

Garcia-Pardo

Andreu

Fornés-Leal

et al. 2018

IEEE Antennas Propag. Mag.

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“…The complex permittivity of pure water for the frequency 10 THz was taken from [14], the ionic conductivity was chosen as σ ion = 1.35 S/m which is in the same scale as the value given in [15]. Proteins in this electrolyte are considered as randomly arranged spheres with a volume fraction of v i = 0.12 and real-valued ε protein = 3 [16]. Using (2) with these parameters leads to the effective data shown in Table III, effective. The structured parameters listed in Table III are used for the model shown in Fig.…”

Section: B Dissipated Power Evaluation Approachmentioning

confidence: 99%

Numerical Verification of the Applicability of the Effective Medium Theory With Respect to Dielectric Properties of Biological Tissue

et al. 2015

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Especially in the THz region, little data is available regarding material properties based on measurements. It has been argued that the effective medium theory could provide a useful tool to estimate material data needed for electromagnetic field computations. In this paper, two numerical approaches are presented to test the applicability of the effective medium theory (EMT) with special regard to mm-and sub-mm-wavelengths. One approach is based on the well-known free-space method and the other one on a power loss evaluation scheme. Within the scope of application of the free-space method, the usability of the EMT is proven for two sets of dielectric tissue parameters on a longitudinally homogeneous and transversely structured sample. Moreover, power loss evaluation is a suitable method to show the applicability of the EMT. Analysis of layered models at 1-10 THz confirms that the EMT is a suitable tool to develop equivalent homogenized models with maximum errors for the dissipated powers of about 1%. In a more realistic example for a physiological fluid with spherical inclusions, the EMT yields an error of less than 1%.

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“…For example, a theoretical model of the skin tissue is reported in the RF frequency range [13]. Also, a theoretical model of the cornea tissue is reported in the 0.4 -10 GHz frequency range [14].…”

Section: Introductionmentioning

confidence: 99%

Development of a Theoretical Microwave Model to Predict the Dielectric Properties of Articular Cartilage Tissues

2021

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Recently, a growing research on the electromagnetic properties of biological tissues has been observed, particularly at microwave frequencies. The frequency variation of the dielectric properties of tissues at microwave frequencies may be described by the Cole-Cole relaxation model. This model is frequently used by researchers to extrapolate the measured permittivity data to higher frequencies based on polynomial frequency fits. Robust theoretical model that takes into consideration the geometry and distribution of tissue materials is much demanded. The aim of this paper is to develop a structured model to predict the dielectric properties of human cartilage tissues based on their microstructure. The presented approach is multi-scale which begins from the microscopic scale and derives the macroscopic properties after several scale-steps. The predicted model agrees reasonably with the estimated values of Cole-Cole relaxation model. Such a model would be useful in developing microwave imaging and patient treatment planning. Moreover, this model is expected to find application in non-invasive medical sensing where it can relate dielectric response to pathological structural changes in the tissue.

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A Theoretical Model for the Frequency-Dependent Dielectric Properties of Corneal Tissue at Microwave Frequencies

Cited by 9 publications

References 42 publications

Ultrawideband Technology for Medical In-Body Sensor Networks: An Overview of the Human Body as a Propagation Medium, Phantoms, and Approaches for Propagation Analysis

Ultrawideband Technology for Medical In-Body Sensor Networks: An Overview of the Human Body as a Propagation Medium, Phantoms, and Approaches for Propagation Analysis

Numerical Verification of the Applicability of the Effective Medium Theory With Respect to Dielectric Properties of Biological Tissue

Development of a Theoretical Microwave Model to Predict the Dielectric Properties of Articular Cartilage Tissues

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