COMMENTS ON DISTINGUISHABILITY IN ELECTRICAL-IMPEDANCE IMAGING

In Electrical Impedance Imaging (EII), the spatial distribution of ele ctrical resistivity of a volume conductor is reconstructed from measur ements of potential which result from an externally applied electric f ield. The ability of such a system to distinguish a target inhomogenei ty and the discussion of several measures of distinguishability has be en a subject of a recent study [1]. In this communication a few commen ts are added to those of [1]. The medical device safety regulations li mit the maximum total input current which can be applied to the human thorax [2]-[5]. Based on the currently existing safety regulations, if the input current to the thorax is limited and constant, patterns app lied between opposite electrodes result in higher distinguishability o f a centered target than the cosine current patterns as suggested by [ 1].