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Tracking boundary movement and exterior shape modelling in lung EIT imaging

Electrical impedance tomography (EIT) has shown significant promise for lung imaging. One key challenge for EIT in this application is the movement of electrodes during breathing, which introduces artefacts in reconstructed images. Various approaches have been proposed to compensate for electrode mo...

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Bibliographic Details
Main Authors: Biguri, Ander (Author) , Grychtol, Bartłomiej (Author)
Format: Article (Journal)
Language:English
Published: 26 May 2015
In: Physiological measurement
Year: 2015, Volume: 36, Issue: 6, Pages: 1119-1135
ISSN:1361-6579
DOI:10.1088/0967-3334/36/6/1119
Online Access:Verlag, Volltext: http://dx.doi.org/10.1088/0967-3334/36/6/1119
Verlag, Volltext: http://stacks.iop.org/0967-3334/36/i=6/a=1119
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Author Notes:A. Biguri, B. Grychtol, A. Adler and M. Soleimani

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520 |a Electrical impedance tomography (EIT) has shown significant promise for lung imaging. One key challenge for EIT in this application is the movement of electrodes during breathing, which introduces artefacts in reconstructed images. Various approaches have been proposed to compensate for electrode movement, but no comparison of these approaches is available. This paper analyses boundary model mismatch and electrode movement in lung EIT. The aim is to evaluate the extent to which various algorithms tolerate movement, and to determine if a patient specific model is required for EIT lung imaging. Movement data are simulated from a CT-based model, and image analysis is performed using quantitative figures of merit. The electrode movement is modelled based on expected values of chest movement and an extended Jacobian method is proposed to make use of exterior boundary tracking. Results show that a dynamical boundary tracking is the most robust method against any movement, but is computationally more expensive. Simultaneous electrode movement and conductivity reconstruction algorithms show increased robustness compared to only conductivity reconstruction. The results of this comparative study can help develop a better understanding of the impact of shape model mismatch and electrode movement in lung EIT. 
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