UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Correction of electrode modelling errors in multi-frequency EIT imaging

Jehl, M; Holder, D; (2016) Correction of electrode modelling errors in multi-frequency EIT imaging. Physiological Measurement , 37 (6) pp. 893-903. 10.1088/0967-3334/37/6/893. Green open access

[thumbnail of Jehl and Holder Correction of electrode modelling errors in multi-frequency EIT imaging VoR.pdf] Text
Jehl and Holder Correction of electrode modelling errors in multi-frequency EIT imaging VoR.pdf

Download (938kB)

Abstract

The differentiation of haemorrhagic from ischaemic stroke using electrical impedance tomography (EIT) requires measurements at multiple frequencies, since the general lack of healthy measurements on the same patient excludes time-difference imaging methods. It has previously been shown that the inaccurate modelling of electrodes constitutes one of the largest sources of image artefacts in non-linear multi-frequency EIT applications. To address this issue, we augmented the conductivity Jacobian matrix with a Jacobian matrix with respect to electrode movement. Using this new algorithm, simulated ischaemic and haemorrhagic strokes in a realistic head model were reconstructed for varying degrees of electrode position errors. The simultaneous recovery of conductivity spectra and electrode positions removed most artefacts caused by inaccurately modelled electrodes. Reconstructions were stable for electrode position errors of up to 1.5 mm standard deviation along both surface dimensions. We conclude that this method can be used for electrode model correction in multi-frequency EIT.

Type: Article
Title: Correction of electrode modelling errors in multi-frequency EIT imaging
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0967-3334/37/6/893
Publisher version: http://dx.doi.org/10.1088/0967-3334/37/6/893
Language: English
Additional information: Copyright © 2016 Institute of Physics and Engineering in Medicine. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (CC BY 3.0) (https://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Keywords: electrical impedance tomography, stroke type detection, multi-frequency image reconstruction, electrode model correction
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1502568
Downloads since deposit
113Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item