V. Kolehmainen et al., ASSESSMENT OF ERRORS IN STATIC ELECTRICAL-IMPEDANCE TOMOGRAPHY WITH ADJACENT AND TRIGONOMETRIC CURRENT PATTERNS, Physiological measurement, 18(4), 1997, pp. 289-303
In electrical impedance tomography (EIT), difference imaging is often
preferred over static imaging. This is because of the many unknowns in
the forward modelling which make it difficult to obtain reliable abso
lute resistivity estimates. However, static imaging and absolute resis
tivity values are needed in some potential applications of EIT. In thi
s paper we demonstrate by simulation the effects of different error co
mponents that are included in the reconstruction of static EIT images.
All simulations are carried out in two dimensions with the so-called
complete electrode model. Errors that are considered are the modelling
error in the boundary shape of an object, errors in the electrode siz
es and localizations and errors in the contact impedances under the el
ectrodes. Results using both adjacent and trigonometric current patter
ns are given.