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oai:recercat.cat:2117/13902025-07-17T11:12:19Zcom_2072_1033col_2072_452950

Propagation of measurement noise through backprojection reconstruction in electrical impedance tomography Frangi Caregnato, Alejandro Riu Costa, Pere Joan Rosell Ferrer, Francisco Javier Viergever, Max A. Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica Electrodiagnosis Computer vision Electric impedance imaging Gaussian distribution Image reconstruction Measurement errors Medical image processing Backprojection reconstruction Medical diagnostic imaging Electrical impedance tomography Error propagation theory Reconstruction error characterization Spatial characterization Current drivers Voltage detectors Acquisition system architecture Spatially nonstationary Gaussian distribution Electrodiagnòstic Visió per ordinador en medicina 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. Peer Reviewed 2002-06-30 Article Frangi, AF; Riu, PJ; Rosell J; Viergever, MA. Propagation of measurement noise through backprojection reconstruction in electrical impedance tomography. IEEE Transactions on Medical Imaging, 2002, vol. 21 núm. 6, p. 566-578 0278-0062 https://hdl.handle.net/2117/1390 eng DGICYT PB93-0952 Open Access 566-578 application/pdf IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC