BOUNDARY SHAPE AND ELECTRICAL-IMPEDANCE TOMOGRAPHY

In electrical impedance tomography the boundary shape is often inaccur ately known. If the boundary shape is wrong (in a three-dimensional pr oblem) there will not generally be an isotropic conductivity which fit s the current and voltage data. Both the conductivity and boundary sha pe can be determined by electrical data together with three spatial me asurements. In two dimensions errors in boundary shape could be accoun ted for by a change in conductivity, but not if the length scale on th e boundary is also known.