CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Tracking Conductivity Variations in The Absence of Accurate State Evolution Models in Electrical Impedance Tomography

Parham Hashemzadeh ; V Sahota ; M.F. Callaghan ; H.E. Dib ; Lennart Svensson (Institutionen för signaler och system, Signalbehandling) ; Richard Bayford
Proceedings of the 4th International Conference on Bioinformatics and Biomedical Engineering p. . (2010)
[Konferensbidrag, refereegranskat]

We present results on both linear and non-linear approaches in tracking conductivity variations in electrical impedance tomography. Throughout this study, we use both synthetic and measured data. The true system dynamics is considered as unknown and modelled as a random walk. In the linear reconstructions, the time evolution model is augmented with a Gaussian smoothness prior and results are shown using two different models for the covariance matrix of the process noise. Furthermore, we compare the reconstructions of the one step Gauss-Newton method to the Kalman filter on measured data from an adult human subject. In the non-linear study, we compare the performance of the extended Kalman filter against the particle filter on a simple test case. It is observed that the particle filter shows superior performance in tracking nonlinear/non-Gaussian conductivity variations.

Denna post skapades 2010-05-12. Senast ändrad 2013-08-20.
CPL Pubid: 121525