Influence of Initial Conditions on Conductivity Calculation via the MR-EIT Inverse Problem
The article describes the testing of an algorithm for conductivity reconstruction based on regularization techniques.For the calculation of conductivity in tested samples,the algorithm exploits the measured values of magnetic fix density B in the vicinity of these samples.Generally,problems based on electrical impedance tomography are non-linear and ill-posed.The reconstruction process is described as the minimization of the suitably chosen objective function Ψ(σ)with respect to σ.In the algorithm for the conductivity image reconstruction,we tested the values of initial conditions that exert significant influence on both the stability of the solution and the accuracy of the resulting conductivity image.The influence of the initial value of regularization parameter σ was subject to testing; the initial value was changed within several orders.Moreover,we tested the magnitude of the change of regularization parameter Δα during the iteration process.The testing of the conductivity initial value was realized in such a manner that the initial value was selected within several intervals and as a random value on each element.In all the parameters tested,we evaluated the relative error,solution time,and stability of the reconstruction process.The conductivity reconstruction result,the accuracy,the time consumption,and the reconstruction time are presented in the article.
T.K(r)í(z) J.Dědková
Department of Theoretical and Experimental Electrical Engineering Brno University of Technology,Kolejní4,Brno 612 00,Czech Republic
国际会议
Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)
台北
英文
171-174
2013-03-01（万方平台首次上网日期，不代表论文的发表时间）