Patent ID: 7603158
Filing Date: 2009-10-13
Classification: A61B

Abstract:
1. A method of non-invasive imaging of electrical impedance of an object, comprising the steps of: a) making measurements of at least two nonparallel current density vector fields, {right arrow over (J)} b) utilizing a computer device to directly calculate, without iteration a logarithmic gradient of local conductivity,∇ ln σ(x, y, z), within the region of interest without requiring an electric potential value using a formula where J 1 ={right arrow over (J)} 1 (x,y,z), J 2 ={right arrow over (J)} 2 =(x, y, z), and ∇ lnσ=∇ lnσ(x,y,z), and where J 1 and J 2 are a pair of measured nonparallel current densities at point (x,y,z) and ∇ denotes a gradient operator; and c) producing a conductivity image based on the calculated logarithmic gradient of local conductivity within the region of interest.