ASSESSMENT OF ERRORS IN STATIC ELECTRICAL-IMPEDANCE TOMOGRAPHY WITH ADJACENT AND TRIGONOMETRIC CURRENT PATTERNS

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.