Calibration device for electric impedance tomography system

Abstract

The invention discloses a calibration device for an electric impedance tomography system. The calibration device comprises basic impedance units for simulating impedance distribution or the disturbance of the impedance distribution and electrode / skin contact units for simulating electrode / skin contact characteristics, wherein the basic impedance units are distributed to form a calibration network with a known conductivity; at least four layers of basic impedance units are arranged from the central point to the edges of the calibration network; and the electrode / skin contact units are formed by electrode / skin contact impedance modules and electrode polarization potential simulation modules, distributed around the calibration network at equal interval and connected with the basic impedance units on the outermost layer of the calibration network. The device provided by the invention can meet the evaluating requirements of performance and an image reconstruction effect of an electric impedance tomography data acquisition system.

Description

Technical field [0001] The invention belongs to the technical field of electrical impedance tomography imaging, and relates to a calibration device for an electrical impedance tomography imaging system. Background technique [0002] Electrical impedance tomography is a new type of medical imaging technology. This technology is based on the fact that different biological tissues have different resistivity characteristics, and changes in pathophysiological functions will also significantly change the electrical impedance characteristics of the tissue. By sticking it on the target area of ​​the human body, Place a circle of electrodes on the body surface, inject a weak AC current into the body through these electrodes, which is completely non-invasive to the human body, then measure the response voltage signal on each electrode, and finally use a specific image reconstruction algorithm to achieve the desired result within a certain section or area. Imaging of the two- or three-...

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Problems solved by technology

However, because the structure of the device is too simple, the radial positioning of the disturbance position cannot be realized, so it is difficult to meet the application requirements.

[0006] In addition, in the data acquisition of electrical impedance tomography, both the application of the excitation signal and the measurement of the response signal need to be realized through electrodes connected to the skin, and the electrical signal conversion process between the electrodes and the skin is a complex electrochemical process. process, and will have a non-negligible impact on the accuracy of electrical impedance signal measurement

However, none of the existing models can simulate or control this process, so it cannot be used to evaluate the influence of electrode performance on imaging

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