Propagation of measurement noise through backprojection reconstruction in electrical impedance tomography

A.R. Frangi, P.J. Riu, J. Rosell, M.A. Viergever
2002 IEEE Transactions on Medical Imaging  
A framework to analyze the propagation of measurement noise through backprojection reconstruction algorithms in electrical impedance tomography (EIT) is presented. Two measurement noise sources were considered: noise in the current drivers and in the voltage detectors. The influence of the acquisition system architecture (serial/semi-parallel) is also discussed. Three variants of backprojection reconstruction are studied: basic (unweighted), weighted and exponential backprojection. The results
more » ... ction. The results of error propagation theory have been compared with those obtained from simulated and experimental data. This comparison shows that the approach provides a good estimate of the reconstruction error variance. It is argued that the reconstruction error in EIT images obtained via backprojection can be approximately modeled as a spatially nonstationary Gaussian distribution. This methodology allows us to develop a spatial characterization of the reconstruction error in EIT images.
doi:10.1109/tmi.2002.800612 pmid:12166852 fatcat:25tdvfsihfc7xhrqalqmorlq6q