Image Reconstruction in Microwave Tomography Using a Dielectric Debye Model
Artikel i vetenskaplig tidskrift, 2012

In this paper, quantitative dielectric image reconstruction based on broadband microwave measurements is investigated. A time-domain-based algorithm is derived where Debye model parameters are reconstructed in order to take into account the strong dispersive behavior found in biological tissue. The algorithm is tested with experimental and numerical data in order to verify the algorithm and to investigate improvements in the reconstructed image resulting from the improved description of the dielectric properties of the tissue when using broadband data. The comparison is made in relation to the more commonly used conductivity model. For the evaluation, two examples were considered, the first was a lossy saline solution and the second was less lossy tap water. Both liquids are strongly dispersive and used as a background medium in the imaging examples. The results show that the Debye model algorithm is of most importance in the tap water for a bandwidth of more than 1.5 GHz. Also the saline solution exhibits a dispersive behavior but since the losses restrict the useful bandwidth, the Debye model is of less significance even if somewhat larger and stronger artifacts can be seen in the conductivity model reconstructions.

dispersion

finite-difference time-domain (FDTD) methods

Debye model

microwave measurements

microwave imaging

Författare

Andreas Fhager

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Biomedicinsk elektromagnetik

Mats Gustafsson

Lunds universitet

S. Nordebo

Linnéuniversitetet, Växjö

IEEE Transactions on Biomedical Engineering

0018-9294 (ISSN)

Vol. 59 1 156 - 166 6022758

Styrkeområden

Informations- och kommunikationsteknik

Livsvetenskaper och teknik

Ämneskategorier

Medicinsk laboratorie- och mätteknik

Övrig annan teknik

Signalbehandling

DOI

10.1109/TBME.2011.2168606