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A Novel Approach for Removing the Hook Effect Artefact from Electrical Bioimpedance Spectroscopy Measurements
University of Borås, School of Engineering.
2009 (English)In: Journal of Physics: Conference Series, Institute of Physics Publishing Ltd. , 2009Conference paper, Published paper (Refereed)
Abstract [en]

Very often in Electrical Bioimpedance (EBI) spectroscopy measurements the presence of stray capacitances creates a measurement artefact commonly known as Hook Effect. Such an artefact creates a hook-alike deviation of the EBI data noticeable when representing the measurement on the impedance plane. Such Hook Effect is noticeable at high frequencies but it also causes a data deviation at lower measurement frequencies. In order to perform any accurate analysis of the EBI spectroscopy data, the influence of the Hook Effect must be removed. An established method to compensate the hook effect is the well known Td compensation, which consist on multiplying the obtained spectrum, Zmeas() by a complex exponential in the form of exp[jTd]. Such a method cannot correct entirely the Hook Effect since the hook-alike deviation occurs a broad frequency range in both magnitude and phase of the measured impedance, and by using a real value for Td. First, a real value only modifies the phase of the measured impedance and second, it can only correct the Hook Effect at a single frequency. In addition, the process to select a value for Td by an iterative process with the aim to obtain the best Cole fitting lacks solid scientific grounds. In this work the Td compensation method is revisited and a modified approach for correcting the Hook Effect that includes a novel method for selecting the correcting values is proposed. The initial validation results confirm that the proposed method entirely corrects the Hook Effect at all frequencies.

Place, publisher, year, edition, pages
Institute of Physics Publishing Ltd. , 2009.
Keyword [en]
bioimpedance, measurement instrumentation, applied signal processing, artefacts correction, Medical Electronics
National Category
Control Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering Biomedical Laboratory Science/Technology
Identifiers
URN: urn:nbn:se:hb:diva-6298DOI: 10.1088/1742-6596/224/1/012126Local ID: 2320/5952OAI: oai:DiVA.org:hb-6298DiVA: diva2:886985
Conference
XIVth International Conference on Electrical Bioimpedance, Florida, USA
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2017-02-09Bibliographically approved

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Seoane, Fernando
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
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  • de-DE
  • en-GB
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