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  • Title: Propagation of measurement noise through backprojection reconstruction in electrical impedance tomography.
    Author: Frangi AF, Riu PJ, Rosell J, Viergever MA.
    Journal: IEEE Trans Med Imaging; 2002 Jun; 21(6):566-78. PubMed ID: 12166852.
    Abstract:
    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 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.
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