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Real-time management of faulty electrodes in electrical impedance tomography

Summary: Real-time management of faulty electrodes in
electrical impedance tomography
Alzbeta E. Hartinger, Robert Guardo, Andy Adler, and HervŽe Gagnon*
Completely or partially disconnected electrodes are a fairly common occurrence in many EIT clinical applica-
tions. Several factors can contribute to electrode disconnection: patient movement, perspiration, manipulations by
clinical staff and defective electrode leads or electronics. By corrupting several measurements, faulty electrodes
introduce significant image artifacts. In order to properly manage faulty electrodes, it is necessary to 1) account for
invalid data in image reconstruction algorithms and 2) automatically detect faulty electrodes. This paper presents a
two-part approach for real-time management of faulty electrodes based on the principle of voltage-current reciprocity.
The first part allows accounting for faulty electrodes in EIT image reconstruction without a priori knowledge of
which electrodes are at fault. The method properly weights each measurement according to its compliance with the
principle of voltage-current reciprocity. Results show that the algorithm is able to automatically determine the valid
portion of the data and use it to calculate high quality images. The second part of the approach allows automatic real-
time detection of at least one faulty electrode with 100% sensitivity and two faulty electrodes with 80% sensitivity
enabling the clinical staff to fix the problem as soon as possible to minimize data loss.
Index Terms
Electrical impedance tomography, biomedical instrumentation, faulty electrodes, voltage-current reciprocity prin-
This work was supported in part by the Natural Sciences and Engineering Research Council of Canada and the Fonds quŽebecois de la


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


Collections: Computer Technologies and Information Sciences