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Antenna Modeling and Reconstruction Accuracy of Time Domain-Based Image Reconstruction in Microwave Tomography

Andreas Fhager (Institutionen för signaler och system, Biomedicinsk elektromagnetik) ; S.K. Padhi ; Mikael Persson (Institutionen för signaler och system, Biomedicinsk elektromagnetik) ; J. Howard
International Journal of Biomedical Imaging (1687-4188). Vol. 2013 (2013),
[Artikel, refereegranskad vetenskaplig]

Nonlinear microwave imaging heavily relies on an accurate numerical electromagnetic model of the antenna system. The model is used to simulate scattering data that is compared to its measured counterpart in order to reconstruct the image. In this paper an antenna system immersed in water is used to image different canonical objects in order to investigate the implication of modeling errors on the final reconstruction using a time domain-based iterative inverse reconstruction algorithm and three-dimensional FDTD modeling. With the test objects immersed in a background of air and tap water, respectively, we have studied the impact of antenna modeling errors, errors in the modeling of the background media, and made a comparison with a two-dimensional version of the algorithm. In conclusion even small modeling errors in the antennas can significantly alter the reconstructed image. Since the image reconstruction procedure is highly nonlinear general conclusions are very difficult to make. In our case it means that with the antenna system immersed in water and using our present FDTD-based electromagnetic model the imaging results are improved if refraining from modeling the water-wall-air interface and instead just use a homogeneous background of water in the model.

Denna post skapades 2013-04-02. Senast ändrad 2013-04-02.
CPL Pubid: 175194


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Institutioner (Chalmers)

Institutionen för signaler och system, Biomedicinsk elektromagnetik


Elektroteknik och elektronik

Chalmers infrastruktur