The effect of serial data collection on the accuracy of electrical impedance tomography images

Yerworth, Rebecca J. and Bayford, Richard (2013) The effect of serial data collection on the accuracy of electrical impedance tomography images. Physiol. Meas., 34 (6). pp. 659-669. ISSN 0967-3334

Full text is not in this repository.

Abstract

There has been a surge of interest in using electrical impedance tomography (EIT) for monitoring regional lung ventilation, however, EIT is an ill-conditioned problem, and errors/noise in the boundary voltages can have an undesirable effect on the quality of the final image. Most EIT systems in clinical usage use serial data collection hence data used to create a single image will have been collected at different times. This paper presents a study of the resulting image distortion, and proposes a method for correcting this lag in situations where the frame rate is insufficient to prevent significant image degradation. Significant correlation between the standard deviation of the time dependent reciprocity error and time delay dLe between the reciprocal electrode combinations was found for both adult and neonate data. This was reduced when the data was corrected for dLe. Original and corrected data was reconstructed with the GREIT algorithm and visible differences were found for the neonate data. Ideally EIT systems should be run at a frame rate of at least 50 times the frequency of the dominant and interesting physiological signals. Where this is not practical, the intra-frame system timings should be determined and lag corrected for.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
Item ID: 15513
Useful Links:
Depositing User: Richard Bayford
Date Deposited: 28 Apr 2015 15:17
Last Modified: 13 Oct 2016 14:33
URI: http://eprints.mdx.ac.uk/id/eprint/15513

Actions (login required)

Edit Item Edit Item