Two-part electrodes of the physical phantom for EIT

Abstract

In this article explored methods for increasing of the accuracy of measurement in the hardware part of the electrical impedance tomograph, in particular, in its electrode system, which contains two-parts (combined) electrodes and are installed directly in a physical phantom. The principles of construction of the measuring part of the EITomograph using simple and combined electric drives are considered. Justified the choice of material for the producing of electrodes. Presented the construction of combined electrodes and the parameters of different materials for their producing. In the article describe the influence of non-identity for physical sizes of combined electrodes. Shown possible variants for the compensation of inaccuracy in the producing of electrodes and the inaccuracy of their installation. Increased ease of use and maintainability signal transmission lines by using these electrodes. Compared to simple electrodes, combined have several advantages: maintainability; rapid replacement of the electrode in a physical phantom (even in the presence of an electrolyte); manufacturability of producing; higher mechanical resistance and reliability; absolute decoupling of the measuring circle and power circle in the hardware part of the EITomograph; significantly lower amount of occurrence of artifacts during the image reconstruction. That's why application of combined electrodes leads not only to facilitate the physical construction and setting of the EITomograph. It also increases the quality of the solution of the inverse problem.