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Impact of Electrode Area, Contact Impedance and Boundary Shape on EIT Images

Summary: Impact of Electrode Area, Contact Impedance and
Boundary Shape on EIT Images
Alistair Boyle and Andy Adler
Systems and Computer Engineering, Carleton University, Ottawa, ON, Canada
E-mail: boyle@sce.carleton.ca, adler@sce.carleton.ca
Abstract. Electrical Impedance Tomography (EIT) measures the conductivity
distribution within an object based on the current applied and voltage measured
at surface electrodes. Thus, EIT images are sensitive to electrode properties (i.e.
contact impedance, electrode area, and boundary shape under the electrode).
While some of these electrode properties have been investigated individually, this
paper investigates these properties and their interaction using Finite Element
Method (FEM) simulations and the Complete Electrode Model (CEM). The
effect of conformal deformations on image reconstruction when using the CEM
was of specific interest. Observed artifacts were quantified using a measure
that compared an ideal image to the reconstructed image, in this case a no-
noise reconstruction that isolated the electrodes' effects. For electrode contact
impedance and electrode area, uniform reductions to all electrodes resulted in
ringing artifacts in the reconstructed images when the CEM was used, while
parameter variations that were not correlated amongst electrodes resulted in
artifacts distributed throughout the image. When the boundary shape changed


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


Collections: Computer Technologies and Information Sciences