Thematische Bibliographien / Skin-Electrode modeling

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Auswahl der wissenschaftlichen Literatur zum Thema „Skin-Electrode modeling“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Skin-Electrode modeling"

Murphy, Brendan B., Brittany H. Scheid, Quincy Hendricks, Nicholas V. Apollo, Brian Litt und Flavia Vitale. „Time Evolution of the Skin–Electrode Interface Impedance under Different Skin Treatments“. Sensors 21, Nr. 15 (31.07.2021): 5210. http://dx.doi.org/10.3390/s21155210.

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A low and stable impedance at the skin–electrode interface is key to high-fidelity acquisition of biosignals, both acutely and in the long term. However, recording quality is highly variable due to the complex nature of human skin. Here, we present an experimental and modeling framework to investigate the interfacial impedance behavior, and describe how skin interventions affect its stability over time. To illustrate this approach, we report experimental measurements on the skin–electrode impedance using pre-gelled, clinical-grade electrodes in healthy human subjects recorded over 24 h following four skin treatments: (i) mechanical abrasion, (ii) chemical exfoliation, (iii) microporation, and (iv) no treatment. In the immediate post-treatment period, mechanical abrasion yields the lowest initial impedance, whereas the other treatments provide modest improvement compared to untreated skin. After 24 h, however, the impedance becomes more uniform across all groups (<20 kΩ at 10 Hz). The impedance data are fitted with an equivalent circuit model of the complete skin–electrode interface, clearly identifying skin-level versus electrode-level contributions to the overall impedance. Using this model, we systematically investigate how time and treatment affect the impedance response, and show that removal of the superficial epidermal layers is essential to achieving a low, long-term stable interface impedance.

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Sawicki, B., und M. Okoniewski. „Adaptive Mesh Refinement Techniques for 3-D Skin Electrode Modeling“. IEEE Transactions on Biomedical Engineering 57, Nr. 3 (März 2010): 528–33. http://dx.doi.org/10.1109/tbme.2009.2032163.

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Malnati, Claudio, Daniel Fehr, Fabrizio Spano und Mathias Bonmarin. „Modeling Stratum Corneum Swelling for the Optimization of Electrode-Based Skin Hydration Sensors“. Sensors 21, Nr. 12 (09.06.2021): 3986. http://dx.doi.org/10.3390/s21123986.

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We present a novel computational model of the human skin designed to investigate dielectric spectroscopy electrodes for stratum corneum hydration monitoring. The multilayer skin model allows for the swelling of the stratum corneum, as well as the variations of the dielectric properties under several hydration levels. According to the results, the stratum corneum thickness variations should not be neglected. For high hydration levels, swelling reduces the skin capacitance in comparison to a fixed stratum corneum thickness model. In addition, different fringing-field electrodes are evaluated in terms of sensitivity to the stratum corneum hydration level. As expected, both conductance and capacitance types of electrodes are influenced by the electrode geometry and dimension. However, the sensitivity of the conductance electrodes is more affected by dimension changes than the capacitance electrode leading to potential design optimization.

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Brehm, Peter J., und Allison P. Anderson. „Modeling the Design Characteristics of Woven Textile Electrodes for Long-Term ECG Monitoring“. Sensors 23, Nr. 2 (04.01.2023): 598. http://dx.doi.org/10.3390/s23020598.

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An electrocardiograph records the periodic voltage generated by the heart over time. There is growing demand to continuously monitor the ECG for proactive health care and human performance optimization. To meet this demand, new conductive textile electrodes are being developed which offer an attractive alternative to adhesive gel electrodes but they come with their own challenges. The key challenge with textile electrodes is that the relationship between the manufacturing parameters and the ECG measurement is not well understood, making design an iterative process without the ability to prospectively develop woven electrodes with optimized performance. Here we address this challenge by applying the traditional skin−electrode interface circuit model to woven electrodes by constructing a parameterized model of the ECG system. Then the unknown parameters of the system are solved for with an iterative MATLAB optimizer using measured data captured with the woven electrodes. The results of this novel analysis confirm that yarn conductivity and total conductive area reduce skin electrode impedance. The results also indicate that electrode skin pressure and moisture require further investigation. By closing this gap in development, textile electrodes can be better designed and manufactured to meet the demands of long−term ECG capture.

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Ramos, Airton, und Pedro Bertemes. „Electrode Probe Modeling for Skin Cancer Detection by using Impedance Method“. IEEE Latin America Transactions 10, Nr. 2 (März 2012): 1466–75. http://dx.doi.org/10.1109/tla.2012.6187588.

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Hua, P., E. J. Woo, J. G. Webster und W. J. Tompkins. „Finite element modeling of electrode-skin contact impedance in electrical impedance tomography“. IEEE Transactions on Biomedical Engineering 40, Nr. 4 (April 1993): 335–43. http://dx.doi.org/10.1109/10.222326.

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Al-harosh, Mugeb, Egor Chernikov und Sergey Shchukin. „Patient Specific Numerical Modeling for Renal Blood Monitoring Using Electrical Bio-Impedance“. Sensors 22, Nr. 2 (13.01.2022): 606. http://dx.doi.org/10.3390/s22020606.

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Knowledge of renal blood circulation is considered as an important physiological value, particularly for fast detection of acute allograft rejection as well as the management of critically ill patients with acute renal failure. The electrical impedance signal obtained from kidney with an appropriate electrode system and optimal electrode system position regarding to the kidney projection on skin surface reflects the nature of renal blood circulation and tone of renal blood vessels. This paper proposes a specific numerical modelling based on prior information from MRI-data. The numerical modelling was conducted for electrical impedance change estimation due to renal blood distribution. The proposed model takes into the account the geometrical and electrophysiological parameters of tissues around the kidney as well as the actual blood distribution within the kidney. The numerical modelling had shown that it is possible to register the electrical impedance signal caused by renal blood circulation with an electrode system commensurate with the size of kidney, which makes it possible to reduce the influence of surrounding tissues and organs. Experimental studies were obtained to prove the numerical modelling and the effectiveness of developed electrode systems based on the obtained simulation results. The obtained electrical impedance signal with the appropriate electrode system shows very good agreement with the renal blood change estimated using Doppler ultrasound. For the measured electrical impedance signal, it is possible to obtain the amplitude-time parameters, which reflect the hemodynamic characteristics of the kidneys and used in diagnostics, which is the subject of further research.

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Yeroshenko, Olha, Igor Prasol und Oleh Datsok. „SIMULATION OF AN ELECTROMYOGRAPHIC SIGNAL CONVERTER FOR ADAPTIVE ELECTRICAL STIMULATION TASKS“. Innovative Technologies and Scientific Solutions for Industries, Nr. 1 (15) (31.03.2021): 113–19. http://dx.doi.org/10.30837/itssi.2021.15.113.

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The subject matter of the article is an electromyographic signal transducer, which are an integral part of devices for adaptive electrical stimulation of muscle structures based on reverse electromyographic communication. The goal of the work is to study the features, obtaining the corresponding theoretical relationships and computer modeling of a differential biopotential converter, providing amplification of the useful component and suppression of harmful interference, the spectra of which intersect. The following tasks were solved in the article: determining the effect of electrode width and electrode spacing on crosstalk; formation of the electrode-skin model and the input circuit of the transducer, obtaining theoretical relations for calculating the rejection coefficient, construction of the transducer circuit and its computer simulation. The following methods were used – methods of mathematical modeling of processes and technical devices; methods of analysis, structural and parametric synthesis of nonlinear electronic circuits; methods of machine design. The following results were obtained – a biopotential amplifier circuit with tracking feedback on power supply is proposed; modeling of dynamic processes by means of the Multisim program was carried out; on the basis of the constructed model of the electrode-skin input circuit and the obtained analytical relationships, the rejection coefficient of the input circuit of the equivalent circuit is calculated; the requirements for the signal registration module are formulated. Conclusions: The considered version of the electromyographic signal converter circuit based on tracking communication on power supply, effectively rejects 50 Hz common mode noise. On the basis of the constructed equivalent model of the input circuit of the amplifier, the theoretical relation for calculating the rejection coefficient of such amplifiers. The circuit is simulated in the Multisim program, the results confirmed the correctness of its functioning. The requirements for the interelectrode distance and the thickness of the electrodes themselves are also formulated. The results obtained can be used to design complexes for adaptive electrical stimulation.

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Eyvazi Hesar, Milad, Walid Madhat Munief, Achim Müller, Nikhil Ponon und Sven Ingebrandt. „Decomposition and modeling of signal shapes of single point cardiac monitoring“. Current Directions in Biomedical Engineering 6, Nr. 3 (01.09.2020): 583–86. http://dx.doi.org/10.1515/cdbme-2020-3149.

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AbstractWe introduce a novel method for electronic recording of cardiac signals from a single point at the skin in contrast to classical differential electrocardiography (ECG). Ultralownoise transistor devices with an adaptable, auto-stabilizing transimpedance amplifier are able to measure tiny skin potential modulations from a single contact electrode located at an individual’s wrist (single-point cardiography-SPC). Although SPC signals were highly prone to interspersed noise, they contained periodic patterns. In an electromagnetically shielded setting, we could clearly extract breathing and cardiac rhythms from the acquired SPC signals. As the reference, we measured ECG in parallel. Several signal-processing techniques like smoothening, correlation, decomposition and signal extraction showed that SPC signals contain breathing and periodic heart potential variations, which are time-correlated with ECG. In the future, we intent to use this novel technique to measure heart signals from patients in different health conditions.

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Savchuk, Arsen. „Development of a model of electric impedance in the contact between the skin and a capacitive active electrode when measuring electrocardiogram in combustiology“. Eastern-European Journal of Enterprise Technologies 2, Nr. 5 (110) (30.04.2021): 32–38. http://dx.doi.org/10.15587/1729-4061.2021.228735.

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Long-term ECG (electrocardiogram) measurement in patients with burns is a complicated problem since the overlapping of surface contact electrodes can lead to additional injuries. The possibility of ECG recording in patients with burns using capacitive electrodes was not proved, and there are no models of the electrode contact with a patient’s body while rehabilitation means are used. In this paper, the model of the contact between capacitive electrodes and the skin was modified and the circuit model of the contact: skin – bandages (saline solution) – film – active capacitive electrode, was described. The influence of the parameters of a capacitive electrode on the amplitude-frequency characteristics (AFC) of the contact of an electrode with skin was assessed. It was found that contact capacitance is crucial to obtain a high-quality ECG signal. The parameters of the impedance of bandages, saline solution, a dielectric film were calculated, and their effect on the AFC was studied. Based on the modified model, the AFC contact was modeled taking into consideration all the calculated parameters; it was found that the resulting AFC of the contact corresponds to the frequency range of the ECG signal. Analysis of the calculations proves the possibility of using capacitive electrodes when applying various rehabilitation means. It was found that at a change in the impedance of the saline solution from 0.1 gigaohms to 1 gigaohm, the changes in the AFC of the contact are not crucial for the final quality of the received signal. All calculations were carried out by modeling in the Qucs environment (ngspice SPICE). Simulation results can be used in the development of new types of capacitive electrocardiographic electrodes. The proposed model can be used to study other wound covers, as well as to model physiological processes when putting artificial skin and wound covers

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Dissertationen zum Thema "Skin-Electrode modeling"

Gan, Yajian. „Analysis of bioelectric mechanisms at the skin-electrode interface for mobile acquisition of physiological signals : application to ECG measurement for the prevention of cardiovascular diseases“. Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0045.

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Les maladies cardiovasculaires deviennent de plus en plus préoccupantes dans le monde entier. En 2020, le monde souffre de la crise du coronavirus Covid-19, dont le fort rythme de la contagion et les symptômes ont déjà provoqué la mort de plusieurs millions de personnes. Les résultats cliniques ont prouvé que le coronavirus et le médicament thérapeutique (chloroquine) peuvent tous deux endommager le cœur de manière irréversible, sous forme d’arythmies. Par rapport à l’appareil d’ECG utilisé dans les hôpitaux, les appareils d’ECG mobiles à simple dérivation sont la meilleure solution pour surveiller la santé cardiaque à tout moment et en tout lieu. Cependant, la plupart de ces appareils manquent de précision et d’exactitude des mesures, principalement dû au fait que le faible signal ECG est facilement perturbé par le mouvement de l’utilisateur et par l’environnement. Cette thèse étudie tout d’abord le matériau le plus approprié pour l’électrode à simple dérivation. Par la suite, des expériences approfondies ont été élaborées et réalisées pour analyser les sources d’interférence du signal ECG en s’appuyant sur un modèle physico-chimique de l’impédance peau-électrode proposé. Enfin, des méthodes de compensation directes et indirectes (fonction de transfert / intelligence artificielle) sont proposées pour éliminer les interférences dû au mouvement dans le signal ECG. L’objectif de cette recherche est d’appliquer ces résultats à l’optimisation du produit "Witcard" et de fournir des informations expérimentales précieuses à d’autres chercheurs qui travaillent à l’amélioration de la qualité de l’enregistrement des signaux ECG avec des équipements mobiles à simple dérivation
Cardiovascular diseases are becoming increasingly serious worldwide. Especially in the year 2020, when the world is suffering from the coronavirus. Clinical results have proved that both coronavirus and the therapeutic drug (chloroquine) can irreversibly damage the heart, such as arrhythmias. Compared to the ECG machine used in the hospitals that consumes plenty of patients’ time and money, single-lead mobile ECG monitors are the best solution for monitoring heart health anytime, anywhere. However, most of the handheld ECG monitoring devices on the market have not passed clinical testing due to the lack of accuracy and precision of measurement, mainly caused by the fact that the weak ECG signal is easily disturbed by the subject’s movement and the surrounding environment. This thesis investigates the most suitable material for the single-lead electrode at first. Secondly, extensive experiments have been designed and practiced analyzing the sources of ECG noise interference. The physicochemical model of the skin-electrode impedance is proposed at the same time. Finally, directly and indirectly method with the corresponding algorithm (transfer function/artificial intelligence) has been used to eliminate the interference in ECG signal when the motion artifact exists. This research aims to apply these findings to the optimization of the product “Witcard” and provide valuable experimental information to other researchers who work to improve the quality of ECG signal recording with signal-lead mobile ECG equipment

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Buchteile zum Thema "Skin-Electrode modeling"

Köppä, S., V. Savolainen und J. Hyttinen. „Modelling Approach for Assessment of Electrode Configuration and Placement in Bioimpedance Measurements of Skin Irritation“. In IFMBE Proceedings, 1238–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23508-5_320.

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Konferenzberichte zum Thema "Skin-Electrode modeling"

Saadi, Hyem, und Mokhtar Attari. „Electrode-gel-skin interface characterization and modeling for surface biopotential recording: Impedance measurements and noise“. In 2013 2nd International Conference on Advances in Biomedical Engineering (ICABME). IEEE, 2013. http://dx.doi.org/10.1109/icabme.2013.6648844.

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