Identification of an inclusion in Multifrequency Electric Impedance Tomography

TL;DR

This paper proves the uniqueness and stability of multifrequency electrical impedance tomography for imaging conductivity inclusions using spectral decomposition and unique continuation, even with a single current injection.

Contribution

It introduces a spectral decomposition approach and proves the uniqueness and stability of multifrequency EIT with a single current, which is novel in inverse conductivity problems.

Findings

Proves uniqueness of multifrequency EIT with a single current.

Provides stability estimates for the inverse problem.

Uses spectral decomposition and unique continuation techniques.

Abstract

The multifrequency electrical impedance tomography is considered in order to image a conductivity inclusion inside a homogeneous background medium by injecting one current. An original spectral decomposition of the solution of the forward conductivity problem is used to retrieve the Cauchy data corresponding to the extreme case of perfect conductor. Using results based on the unique continuation we then prove the uniqueness of multifrequency electrical impedance tomography and obtain rigorous stability estimates. Our results in this paper are quite surprising in inverse conductivity problem since in general infinitely many input currents are needed in order to obtain the uniqueness in the determination of the conductivity.