Cargando…

A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity

This paper presents a concept for soft field tomographic scan of all the projections of electromagnetic waves emanating from an array of electrodes. Instead of the sequential excitation of all pairs of electrodes in the list of all projections, the new method present here consists of a single and co...

Descripción completa

Detalles Bibliográficos
Autores principales: Dupré, Antoine, Mylvaganam, Saba
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948595/
https://www.ncbi.nlm.nih.gov/pubmed/29597327
http://dx.doi.org/10.3390/s18041013
_version_ 1783322585545572352
author Dupré, Antoine
Mylvaganam, Saba
author_facet Dupré, Antoine
Mylvaganam, Saba
author_sort Dupré, Antoine
collection PubMed
description This paper presents a concept for soft field tomographic scan of all the projections of electromagnetic waves emanating from an array of electrodes. Instead of the sequential excitation of all pairs of electrodes in the list of all projections, the new method present here consists of a single and continuous excitation. This excitation signal is the linear combination of the excitation signals in the projection set at different AC frequencies. The response to a given projection is discriminated by selecting the corresponding AC frequency component in the signal spectra of the digitally demodulated signals. The main advantage of this method is the suppression of transients after each projection, which is particularly problematic in electrical impedance tomography due to contact impedance phenomena and skin effect. The second benefit over the sequential scan method is the increased number of samples for each measurement for reduced noise sensitivity with digital demodulation. The third benefit is the increased temporal resolution in high-speed applications. The main drawback is the increased number of signal sources required (one per electrode). This paper focuses on electrical impedance tomography, based on earlier work by the authors. An experimental proof-of-concept using a simple 4-electrodes electrical impedance tomographic system is presented using simulations and laboratory data. The method presented here may be extended to other modalities (ultrasonic, microwave, optical, etc.).
format Online
Article
Text
id pubmed-5948595
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-59485952018-05-17 A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity Dupré, Antoine Mylvaganam, Saba Sensors (Basel) Article This paper presents a concept for soft field tomographic scan of all the projections of electromagnetic waves emanating from an array of electrodes. Instead of the sequential excitation of all pairs of electrodes in the list of all projections, the new method present here consists of a single and continuous excitation. This excitation signal is the linear combination of the excitation signals in the projection set at different AC frequencies. The response to a given projection is discriminated by selecting the corresponding AC frequency component in the signal spectra of the digitally demodulated signals. The main advantage of this method is the suppression of transients after each projection, which is particularly problematic in electrical impedance tomography due to contact impedance phenomena and skin effect. The second benefit over the sequential scan method is the increased number of samples for each measurement for reduced noise sensitivity with digital demodulation. The third benefit is the increased temporal resolution in high-speed applications. The main drawback is the increased number of signal sources required (one per electrode). This paper focuses on electrical impedance tomography, based on earlier work by the authors. An experimental proof-of-concept using a simple 4-electrodes electrical impedance tomographic system is presented using simulations and laboratory data. The method presented here may be extended to other modalities (ultrasonic, microwave, optical, etc.). MDPI 2018-03-28 /pmc/articles/PMC5948595/ /pubmed/29597327 http://dx.doi.org/10.3390/s18041013 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dupré, Antoine
Mylvaganam, Saba
A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity
title A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity
title_full A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity
title_fullStr A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity
title_full_unstemmed A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity
title_short A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity
title_sort simultaneous and continuous excitation method for high-speed electrical impedance tomography with reduced transients and noise sensitivity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948595/
https://www.ncbi.nlm.nih.gov/pubmed/29597327
http://dx.doi.org/10.3390/s18041013
work_keys_str_mv AT dupreantoine asimultaneousandcontinuousexcitationmethodforhighspeedelectricalimpedancetomographywithreducedtransientsandnoisesensitivity
AT mylvaganamsaba asimultaneousandcontinuousexcitationmethodforhighspeedelectricalimpedancetomographywithreducedtransientsandnoisesensitivity
AT dupreantoine simultaneousandcontinuousexcitationmethodforhighspeedelectricalimpedancetomographywithreducedtransientsandnoisesensitivity
AT mylvaganamsaba simultaneousandcontinuousexcitationmethodforhighspeedelectricalimpedancetomographywithreducedtransientsandnoisesensitivity