ELECTRICAL-IMPEDANCE TOMOGRAPHY USING INDUCED AND INJECTED CURRENTS


GENCER N. , IDER Y., KUZUOGLU M.

CLINICAL PHYSICS AND PHYSIOLOGICAL MEASUREMENT, vol.13, pp.95-99, 1992 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 13
  • Publication Date: 1992
  • Doi Number: 10.1088/0143-0815/13/a/019
  • Title of Journal : CLINICAL PHYSICS AND PHYSIOLOGICAL MEASUREMENT
  • Page Numbers: pp.95-99

Abstract

A two-dimensional forward problem formulation is introduced for electrical impedance tomography (EIT) using induced currents. The forward problem is linearised around a certain resistivity distribution and the inverse problem is formulated as a solution of a linear system of equations. Sensitivity of boundary measurements to resistivity variations arc analysed for spatially uniform, linear and quadratic fields. The formulation, however, is suitable for studying the effects of a general magnetic field applied to induce the currents in the conductive object. A similar inverse problem formulation is also developed for EIT using injected currents. Simulation studies are performed by reconstructing images of a simulation distribution using both methods separately with generalised inversion. It is also shown that the derived formulations for the inverse problems of the two methods can be combined to solve a larger set of equations with a greater number of independent measurements.