Motion artefact correction for capacitive ECG measurement

Heuer, Stephan; Martinez, David; Fuhrhop, Silvester; Ottenbacher, Joerg

doi:10.1109/biocas.2009.5372067

Cited by 22 publications

(11 citation statements)

References 5 publications

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“…Therefore, capacitive electrodes have eliminated the compatibility issues caused by wet and dry electrodes. However, sophistication in capacitive sensor system requires high capacitive coupling to the skin, which may require the use of foreign materials that may suffer from compatibility issues and be susceptible to electrode displacement [5]. Therefore, in this research, the degree to which the conductivity of the electrode, electrode area, insulator thickness, and the dielectric constant of the insulator affect capacitive electrodes fidelity would be examined into details.…”

Section: Introductionmentioning

confidence: 99%

Electrode Characteristics of Non-contact Electrocardiographic Measurement

Kim¹,

Park²,

Joung³

et al. 2015

Transactions on Electrical and Electronic Materials

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The ability to take electrocardiographic measurements while performing our daily activities has become the peoplechoice for modern age vital sign sensing. Currently, wet and dry ECG electrodes are known to pose threats like inflammations, allergic reactions, and metal poisoning due to their direct skin interaction. Therefore, the main goal in this work is to implement a very small ECG sensor system with a capacitive coupling, which is able to detect electrical signals of heart at a distance without the conductive gel. The aim of this paper is to design, implement, and characterize the contactless ECG electrodes. Under a careful consideration of factors that affect a capacitive electrode functional integrity, several different sizes of ECG electrodes were designed and tested with a pilot ECG device. A very small cotton-insulated copper tape electrode (2.324 cm 2 ) was finally attained that could detect and measure bioelectric signal at about 500 um of distance from the subject's chest.

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Section: Introductionmentioning

confidence: 99%

Electrode Characteristics of Non-contact Electrocardiographic Measurement

Kim¹,

Park²,

Joung³

et al. 2015

Transactions on Electrical and Electronic Materials

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“…The combination of our parameter estimation scheme with the inverse system equations of Heuer et al [13] could be used not only to remove the additive artifact but also to correct for signal distortions, leading to a high-fidelity ECG reconstruction.…”

Section: Discussionmentioning

confidence: 99%

“…To undo the artifacts, they solved the inverse system equation. Their method showed promising results in simulation [12] and controlled bench experiments [13]. However, exact knowledge of all the model parameters (system components and dc voltage across the coupling capacitor) is required.…”

Section: Prior Workmentioning

confidence: 99%

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Motion Artifacts in Capacitive ECG Measurements: Reducing the Combined Effect of DC Voltages and Capacitance Changes Using an Injection Signal

Serteyn

Vullings

Meftah

et al. 2015

IEEE Trans. Biomed. Eng.

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Link to publication Citation for published version (APA):Serteyn, A. A. M., Vullings, R., Meftah, M., & Bergmans, J. W. M. (2015). Motion artifacts in capacitive ECG measurements : reducing the combined effect of DC voltages and capacitance changes using an injection signal. IEEE Transactions on Biomedical Engineering, 62(1), 264-273. DOI: 10.1109/TBME.2014.2348178 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract-Capacitive electrodes are a promising alternative to the conventional adhesive electrodes for ECG measurements. They provide more comfort to the patient when integrated in everyday objects (e.g., beds or seats) for long-term monitoring. However, the application of capacitive sensors is limited by their high sensitivity to motion artifacts. For example, motion at the body-electrode interface causes variations of the coupling capacitance which, in the presence of a dc voltage across the coupling capacitor, create strong artifacts in the measurements. The origin, relevance, and reduction of this specific and important type of artifacts are studied here. An injection signal is exploited to track the variations of the coupling capacitance in real time. This information is then used by an identification scheme to estimate the artifacts and subtract them from the measurements. The method was evaluated in simulations, lab environments, and in a real-life recording on an adult's chest. For the type of artifact under study, a strong artifact reduction ranging from 40 dB for simulated data to 9 dB for a given reallife recording was achieved. The proposed method is automated, does not require any knowledge about the measurement system parameters, and provides an online estimate for the dc voltage across the coupling capacitor.

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“…accelerators [5], or an injection signal [6]. K Other methods include those based on the wavelet [7] or a reconstruction equation [8].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of Heuer's method for motion-artifacts reduction in capacitive biopotential measurements

Yang

Serteyn

Vullings

et al. 2014

2014 IEEE Biomedical Circuits and Systems Conference (BioCAS) Proceedings

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Capacitive biopotential measurements are susceptible to motion-artifacts (MA) due to the non-contact property of capacitive electrodes. Among the methods used to reduce MA, the two proposed by Serteyn et al. and Heuer et al. are based on analyzing the time domain behavior of the measurement system. Serteyn's method only partially reduces MA, while Heuer's method can completely remove MA with a reconstruction equation. However, it has not been investigated to what extent Heuer's method can tolerate the inaccuracies in the parameters of the reconstruction equation. This is why we performed a sensitivity analysis on Heuer's method using dynamic simulations in MATLAB with different inaccuracies added to the known reconstruction parameters. The results were compared to those of Serteyn's method, showing that Heuer's method becomes inferior to Serteyn's method at a lower inaccuracy of parameters when the body static charge is higher.

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Motion artefact correction for capacitive ECG measurement

Cited by 22 publications

References 5 publications

Electrode Characteristics of Non-contact Electrocardiographic Measurement

Electrode Characteristics of Non-contact Electrocardiographic Measurement

Motion Artifacts in Capacitive ECG Measurements: Reducing the Combined Effect of DC Voltages and Capacitance Changes Using an Injection Signal

Sensitivity analysis of Heuer's method for motion-artifacts reduction in capacitive biopotential measurements

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