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AUTOMATIC DETECTION OF DETACHED AND ERRONEOUS ELECTRODES IN ELECTRICAL
 

Summary: AUTOMATIC DETECTION OF DETACHED AND
ERRONEOUS ELECTRODES IN ELECTRICAL
IMPEDANCE TOMOGRAPHY
Yednek Asfaw, Andy Adler
School of Information and Technology, University of Ottawa, Ottawa, Canada;
{yasfaw,adler}@site.uottawa.ca
ABSTRACT: One unfortunate occurrence in experimental measurements with electrical impedance
tomography is electrodes which become detached or poorly connected, such that the measured data cannot
be used. This paper presents an automatic approach to detect such erroneous electrodes. It is based on the
assumption that all valid measurements are related by the image reconstruction model, while the
measurements from erroneous electrodes are unrelated. The method calculates an estimate of the data at an
electrode, based on the measurements from all other electrodes, and compares this to the measurements. If
these data match, the set of electrodes does not contain an erroneous electrode. In order to detect an
erroneous electrode amongst N electrodes, all sets of N-1 electrodes are tested, and the set with the best
match between measurements and estimate is identified as the one which excludes the erroneous electrode.
Tests were performed on experimental data and showed consistent identification of erroneous electrodes
with those made by a trained user.
Keywords: Electrical Impedance Tomography, Electrode Errors, Image Reconstruction
1. INTRODUCTION
Electrical Impedance Tomography (EIT) uses body surface electrodes to make measurements

  

Source: Adler, Andy - Department of Systems and Computer Engineering, Carleton University

 

Collections: Computer Technologies and Information Sciences