Feasibility Study of Hydration Monitoring Using Microwaves–Part 1: A Model of Microwave Property Changes With Dehydration

Garrett, David; Fear, Elise C.

doi:10.1109/jerm.2019.2911849

Cited by 20 publications

(15 citation statements)

References 33 publications

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“…IT is worth mentioning that the above listed Debye fitting parameters are dependent on the hydration of the biological tissue , an approach to this dependence was presented by Robinson et al [33] for static properties. In [34] authors used a perturbation method to demonstrate that for an average dehydration of 2% (measured in body weight loss) there is a 1% decrease in permittivity.…”

Section: Simulation and Discussionmentioning

confidence: 99%

ADE-TLM Algorithm for Modeling Wave Propagation in Biological Tissues with Debye Dispersion

Kanjaa

Mrabet

Adraoui

et al. 2020

AEM

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In this paper we present a Transmission Line Matrix (TLM) algorithm for the simulation of electromagnetic wave interaction with a Debye dispersive medium. This new formulation is based on the use of the polarization currents in the medium. The auxiliary differential equation (ADE) method is considered to deal with dispersion after the classical discretization. The accuracy and efficiency of this approach were tested on 1D Debye medium by calculating the reflection coefficient on an air-dielectric interface. The potential of the developed algorithm to model the existence of tumors in a human breast is also demonstrated. The obtained results compared with the analytic model show a good agreement. The number of operations needed for each iteration has been reduced, hence the computational time in comparison with time convolution techniques, while maintaining a comparable numerical accuracy.

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Section: Simulation and Discussionmentioning

confidence: 99%

ADE-TLM Algorithm for Modeling Wave Propagation in Biological Tissues with Debye Dispersion

Kanjaa

Mrabet

Adraoui

et al. 2020

AEM

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show abstract

“…Microwave approaches to hydration assessment provide a promising alternative due to the close relationship between tissue permittivity and tissue water content in the microwave frequency range [11]. It is hypothesized that changes in total body water are reflected in tissue water content due to osmotic pressure [12]. By estimating the tissue water content using sensors in contact with the body, microwave-based hydration assessment has the potential to provide a sensitive, physiologically meaningful, and noninvasive method of monitoring hydration in patients [13,14].…”

Section: Introductionmentioning

confidence: 99%

Microwave Hydration Monitoring: System Assessment Using Fasting Volunteers

Besler

Fear

2021

Sensors

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Hydration is an important aspect of human health, as water is a critical nutrient used in many physiological processes. However, there is currently no clinical gold standard for non-invasively assessing hydration status. Recent work has suggested that permittivity in the microwave frequency range provides a physiologically meaningful metric for hydration monitoring. Using a simple time of flight technique for estimating permittivity, this study investigates microwave-based hydration assessment using a population of volunteers fasting during Ramadan. Volunteers are measured throughout the day while fasting during Ramadan and while not fasting after Ramadan. Comparing the estimated changes in permittivity to changes in weight and the time s fails to establish a clear relationship between permittivity and hydration. Assessing the subtle changes in hydration found in a population of sedentary, healthy adults proves difficult and more work is required to determine approaches suitable for tracking subtle changes in hydration over time with microwave-based hydration assessment techniques.

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Section: Introductionmentioning

confidence: 99%

“…In this context, microwave-based measurement systems represent a convenient solution for noninvasive monitoring of hydration, mostly thanks to the possibility of adapting the measurement approach to the specific application context. In microwave techniques, skin hydration measurements rely on the strong relationship between dielectric properties and water content of biological tissues [ 8 ]. Starting from these considerations, this work addresses the feasibility of an innovative wearable device that monitors skin hydration through a time-domain reflectometry (TDR)-based system.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of a Wearable Reflectometric System for Sensing Skin Hydration

Schiavoni

Monti

Piuzzi

et al. 2020

Sensors

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One of the major goals of Health 4.0 is to offer personalized care to patients, also through real-time, remote monitoring of their biomedical parameters. In this regard, wearable monitoring systems are crucial to deliver continuous appropriate care. For some biomedical parameters, there are a number of well established systems that offer adequate solutions for real-time, continuous patient monitoring. On the other hand, monitoring skin hydration still remains a challenging task. The continuous monitoring of this physiological parameter is extremely important in several contexts, for example for athletes, sick people, workers in hostile environments or for the elderly. State-of-the-art systems, however, exhibit some limitations, especially related with the possibility of continuous, real-time monitoring. Starting from these considerations, in this work, the feasibility of an innovative time-domain reflectometry (TDR)-based wearable, skin hydration sensing system for real-time, continuous monitoring of skin hydration level was investigated. The applicability of the proposed system was demonstrated, first, through experimental tests on reference substances, then, directly on human skin. The obtained results demonstrate the TDR technique and the proposed system holds unexplored potential for the aforementioned purposes.

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Feasibility Study of Hydration Monitoring Using Microwaves–Part 1: A Model of Microwave Property Changes With Dehydration

Cited by 20 publications

References 33 publications

ADE-TLM Algorithm for Modeling Wave Propagation in Biological Tissues with Debye Dispersion

ADE-TLM Algorithm for Modeling Wave Propagation in Biological Tissues with Debye Dispersion

Microwave Hydration Monitoring: System Assessment Using Fasting Volunteers

Feasibility of a Wearable Reflectometric System for Sensing Skin Hydration

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