Electrical impedance tomography imaging system and electrode shielding method thereof

Abstract

The invention discloses an electrical impedance tomography imaging system and an electrode shielding method, which mainly solve the problem that a too small capacitive reactance due to high working frequency, an increase in capacitance due to increase in wire length and the like affect the signal amplitude on a passageway of an electrode in the prior art. The electrical impedance tomography imaging system, comprises master control equipment, an image processing and displaying device, a signal processor and analogue and digital converter circuit, a switch system, a shield driving circuit and an excitation source generating circuit which are respectively connected with the master control equipment, and a shielded electrode which is connected with the switch system and the shielding driving circuit, wherein the switch system is respectively connected with the signal processor and analogue and digital converter circuit, the shield driving circuit and the excitation source generating circuit. Based on the electrical impedance tomography imaging system, the invention also provides a corresponding electrode shielding method, which is efficient and requires low cost for shielding the electrode.

Description

technical field [0001] The invention relates to a shielding method, in particular to a shielding method applied to electrodes in an electrical impedance tomography system. Background technique [0002] Electrical impedance tomography system, referred to as EIT system, is a new generation of medical imaging technology developed in the past 20 years. It has outstanding advantages such as non-invasive, functional imaging and medical image monitoring. The EIT system injects a small current through the body surface electrodes, and measures the corresponding voltage signals on other electrodes at the same time, and reconstructs the image of the conductivity distribution or its change of the measurement target by solving the inverse problem of the Laplace equation. Compared with nuclear medicine imaging techniques such as CT and MRI, EIT has the advantages of non-destructive and harmless, low cost, small size, safety, simple operation, and sensitivity to early cancer lesions, a...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an electrical impedance tomography system and its electrode shielding method, which can solve the problems in the prior art that the capacitive reactance is too small when the operating frequency is high, and the capacitance value will increase when the length of the electrode line increases, which will affect the electrode channel. On the premise of ensuring signal transmission, the efficiency of electrode shielding can be improved, and the cost of system development and use can be reduced.

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