SUBSURFACE ELECTRICAL-IMPEDANCE IMAGING - MEASUREMENT STRATEGY, IMAGE-RECONSTRUCTION AND IN-VIVO RESULTS

In conventional cross-sectional electrical impedance tomography, most of the spatial information is concentrated at the periphery of the ima ge, close to the measurement electrodes. Increasing the number of elec trodes tends not to increase the poor resolution at the centre of the cross-sectional image due to the physics of three-dimensional current flow. in this work an alternative approach, INSEIT (imaging near the s urface by electrical impedance tomography), is explored in which the i mage plane lies at a selected depth in the object parallel to a surfac e electrode array. This approach has been investigated using a prototy pe data measurement system The preliminary in vivo results include sub surface images of respiration, the gastro-intestinal tract and limb bl ood flow.