Methods for Dielectric Reconstruction in Microwave Tomography
Paper in proceedings, 2007

In this paper an iterative electromagnetic time-domain inversion algorithm is described and modified to include a priori data of the shape and dielectric properties of an object being imaged. The algorithm is based on solving the regular and the adjoint Maxwell's equations in order to compute gradients, which are used to update the dielectric profile with the conjugate-gradient method. As an alternative a global optimisation algorithm, the particle swarm optimisation method, has also been investigated. The results show that by exploiting a priori dielectric data in this way a significant improvement in the resolving ability can be obtained. Finally Tikonov and edge preserving regularisation has been investigated and a modified regularisation scheme, supporting the a priori data is suggested.

reconstruction algorithm

regularisation

particle swarm optimisation

a priori data

microwave tomography

Author

Andreas Fhager

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Electromagnetics

Alexey Voronov

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Electromagnetics

Chien-Chih Chen

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Electromagnetics

Mikael Persson

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Electromagnetics

The Second European Conference on Antennas and Propagation (EuCAP 2007), Nov. 11-16, Edinburgh, UK

0537-9989 (ISSN)

Tu1.7.5-

Subject Categories

Medical Laboratory and Measurements Technologies

Computational Mathematics

Other Physics Topics

Probability Theory and Statistics

Other Electrical Engineering, Electronic Engineering, Information Engineering

ISBN

9780863418426

More information

Created

10/7/2017