Dynamic Link Library and Signal Conditioning System for Electrical Impedance Tomography Virtual Instrumentation

Abstract

This paper presents the implementation of a Dynamic Link Library (DLL) and Signal Conditioning System for on-line qualitative reconstruction and analysis of Electrical Impedance Tomography (EIT) images. Three different finite element circular meshes were developed for use with the DLL: 104, 464 and 1016 triangular elements. The library allows the user to choose between three different post-reconstruction options for data visualization: raw data, bilinear interpolation and radial basis function (RBF) interpolation. The DLL can thus be imported into a Virtual Instrumentation software, such as National Instruments LabWindows© and Agilent Technologies HPVEE© to ease the implementation of virtual instrumentation for EIT measurements. A case study is presented: in-phantom object tracking in laboratory test trials.The results suggest that the EIT DLL can be used as part of a virtual instrumentation program, reducing development time for on-line real-time analysis in multiple applications.

Development and research of a virtual test bench for electric impedance tomography channel main components simulation

“…This advantage allows to significantly increase the speed of obtaining research results and their analysis. In addition, the use of such a bench can significantly reduce the cost of testing without the use of expensive hardware solutions that require the involvement of a large number of qualified specialists, as required by the research described in [5,6].…”

“…The work [5] describes the development of the creation of a universal virtual instrumentation in tasks of electrical impedance tomography based on National Instruments LabWindows [5]. It should be noted that the development described in the article is designed to work together with expensive hardware in the form of a data capture card.…”

“…These studies could have a certain value for solving the problems of designing technical means of electrical impedance tomography, however, unresolved issues in the form of an insufficient description of the bench development for studying the signal transmission through analog circuits of semiconductor devices, in particular for medical purposes, impede their use. The works [5][6][7] investigate the issues of creating specialized benches for EIT problems. A common drawback of these works is the widespread use of hardware, which is accompanied by high costs for such studies.…”