Image reconstruction for the selection of electrode patterns in Electrical Impedance Endotomography

Abstract

Electrical Impedance Endotomography is a modality of impedance imaging where multiple electrodes are located at the surface of a probe placed at centre of the region of interest. The probe senses the volume surrounding the probe. In this modality, the simultaneous decreases of the lead fields of the current and voltage electrodes results in strong sensitivity decreases against the distance to the probe. The absence of any physical boundary enables the use of remote electrode yielding lower sensitivity decrease due to the sole decrease of the lead field of the electrode located on the probe. The present study compares the performance of patterns comprising either only electrode located on the probe or comprising one remote electrode. The comparison is based on the images reconstructed using noiseless simulated data. The results show that all the tested modalities give similar image quality for objects near the probe and that, for increasing distance to the probe, the angular resolution decreases for all modalities. It was found that the use of a remote electrode does not yield improvement in the quality of reconstructed images. © Springer-Verlag 2007.