Modelling of internal structures and electrodes in electrical process tomography

Classical electrical impedance tomography is an imaging modality in which t he internal impedivity distribution is reconstructed from the known injecte d currents and voltages measured on the surface of the object. However. in many industrial cases there are a priori known internal structures inside t he vessels which could be used as internal electrodes in tomographical imag ing. In this paper we consider modelling of certain types of internal struc tures and using them as internal electrodes in two-dimensional electrical p rocess tomography. We also propose an inversion approach in which direction al smoothness of the resistivity distribution can be taken into account. Si mulations and laboratory experiments show that. by utilizing internal struc tural information and using these internal structures as additional electro des. we can achieve significant improvements in image reconstruction. Impro vements are shown for the cases in which the electrodes are placed at the c entre of the object and are surrounded by a resistive layer.