An Investigation On The Nonlinearity Of `Soft' Field In Electrical Impedance Tomography System Based On Statistical Methods

In this paper, the nonlinearity in the electrical impedance tomography(EIT) system has been studied based on two statistical methods: the graph method and the uniform design method. The results show that the iterative reconstructing algorithms based on the sensitivity theorem [1][2] have their intrinsic limitations, as the coupling effect between different subareas could not be avoided. And as a result of the uniform design, a failure case has been obtained to validate the coupling effect based on BiConjugate gradients method although limiting the number of iterations controls the artificial errors introduced by the assumption of linearity and the ill-conditioned sensitivity matrix.