Performance evaluation of a digital electrical impedance tomography system

Seyedeh Bentolhoda Ayati, Kaddour Bouazza-Marouf, David Kerr, Michael O'Toole

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Performance evaluation of a portable digital multi-frequency electrical impedance tomography system is presented. The instrumentation hardware and image reconstruction are assessed according to a systematic methodology using a practical phantom. The phantom is equipped with eight electrodes in a ring configuration and a sinusoidal current of constant amplitude is injected using an adjacent current injection protocol. Artificial anomalies are introduced as inhomogeneity targets and the boundary potential data is collected. The images are reconstructed from the boundary data using Comsol Multiphysics and Matlab. Signal to noise ratio (SNR) and accuracy of the measurements are calculated. The limits of detectability and distinguishability of contrasts are measured from the collected potential data set for single and double inhomogeneities. The conductivity of the targets is successfully reconstructed from the potential data measurements. The detectability value is found to be high when a single target is close to the electrodes, while the values are less for the target in the centre. Also, the value of distinguishability increases when the targets move further away from each other.

Original languageEnglish
Title of host publicationProceedings of the IASTED International Symposia on Imaging and Signal Processing in Health Care and Technology, ISPHT 2012
Pages101-105
Number of pages5
DOIs
Publication statusPublished - 10 Aug 2012
EventInternational Symposia on Imaging and Signal Processing in Health Care and Technology, ISPHT 2012 - Baltimore, MD, United States
Duration: 14 May 201216 May 2012

Conference

ConferenceInternational Symposia on Imaging and Signal Processing in Health Care and Technology, ISPHT 2012
Country/TerritoryUnited States
CityBaltimore, MD
Period14/05/1216/05/12

Keywords

  • Assistive medical technology
  • Electrical impedance tomography system
  • Medical image processing
  • Phantom

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