Methods for Dielectric Reconstruction in Microwave Tomography
Paper i proceeding, 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

Författare

Andreas Fhager

Signaler och system, Signalbehandling och medicinsk teknik, Biomedicinsk elektromagnetik

Alexey Voronov

Signaler och system, Signalbehandling och medicinsk teknik, Biomedicinsk elektromagnetik

Chien-Chih Chen

Signaler och system, Signalbehandling och medicinsk teknik, Biomedicinsk elektromagnetik

Mikael Persson

Signaler och system, Signalbehandling och medicinsk teknik, Biomedicinsk elektromagnetik

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

0537-9989 (ISSN)

Tu1.7.5-

Ämneskategorier

Medicinsk laboratorie- och mätteknik

Beräkningsmatematik

Annan fysik

Sannolikhetsteori och statistik

Annan elektroteknik och elektronik

ISBN

9780863418426