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Nearly twenty years developed electrical impedance tomography (Electrical Impedance Tomogra-phy - EIT), compared to the other CT technology , its non - invasive , portable , cheap , and in response to the fast technical advantages , has important applications in the industrial and medical fields . From several angles , to study the low-frequency to inject current-type EIT system . First , it is pointed out that the EIT image reconstruction problem is essentially a control problem ; and discuss the advantages and disadvantages of the common algorithms ; Second , starting from the point of view of the description of the electric field lines , the establishment of an intuitive , simple and uniform object field model and the model is given in imaging ; again , to establish the exact analytical solution for the distribution of injected current EIT system - circular objects , given the convergence analysis ; given the parameters of the model - based recognition applications ; then , in view of the sensitivity matrix is thinking of getting perturbed by using a statistical method of the the common sensitivity matrix due to coupling phenomena research , calculation results illustrate the sensitivity matrix - based approach has limitations , and iterative process ' the due provision residuals ' significance ; Finally, the low-pass filter for EIT system link optimization design and provides a method of analysis similar coupling ; facing technical difficulties and EIT technology simple review .
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