GREIT: a unified approach to 2D linear EIT reconstruction of lung images

Adler, Andy and Arnold, John H. and Bayford, Richard and Borsic, Andrea and Brown, Brian and Dixon, Paul and Faes, Theo J. C. and Frerichs, Inez and Gagnon, Herve and Garber, Yvo and Grychtol, Bartłomiej and Hahn, Gunter and Lionheart, William R. B. and Malik, Anjum and Patterson, Robert P. and Stocks, Janet and Tizzard, Andrew and Weiler, Norbert and Wolf, Gerhard K. (2009) GREIT: a unified approach to 2D linear EIT reconstruction of lung images. Physiological Measurement, 30 (6). S35-S55. ISSN 0967-3334

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Official URL: http://dx.doi.org/10.1088/0967-3334/30/6/S03

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Abstract

Electrical impedance tomography (EIT) is an attractive method for clinically monitoring patients during mechanical ventilation, because it can provide a non-invasive continuous image of pulmonary impedance which indicates the distribution of ventilation. However, most clinical and physiological research in lung EIT is done using older and proprietary algorithms; this is an obstacle to interpretation of EIT images because the reconstructed images are not well characterized. To address this issue, we develop a consensus linear reconstruction algorithm for lung EIT, called GREIT (Graz consensus Reconstruction algorithm for EIT). This paper describes the unified approach to linear image reconstruction developed for GREIT. The framework for the linear reconstruction algorithm consists of (1) detailed finite element models of a representative adult and neonatal thorax, (2) consensus on the performance figures of merit for EIT image reconstruction and (3) a systematic approach to optimize a linear reconstruction matrix to desired performance measures. Consensus figures of merit, in order of importance, are (a) uniform amplitude response, (b) small and uniform position error, (c) small ringing artefacts, (d) uniform resolution, (e) limited shape deformation and (f) high resolution. Such figures of merit must be attained while maintaining small noise amplification and small sensitivity to electrode and boundary movement. This approach represents the consensus of a large and representative group of experts in EIT algorithm design and clinical applications for pulmonary monitoring. All software and data to implement and test the algorithm have been made available under an open source license which allows free research and commercial use.

Item Type:Article
Research Areas:Middlesex University Schools and Centres > School of Science and Technology > Natural Sciences
Middlesex University Schools and Centres > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
ID Code:9322
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Deposited On:06 Sep 2012 07:18
Last Modified:08 Oct 2014 10:52

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