Switching system for electrical impedance tomography

Abstract

The invention discloses a switching system for electrical impedance tomography (EIT). The switching system comprises a flexible flat cable pin-shaped socket, a D-SUB connector, four shape memory alloy (SMA) connectors, four groups of decoding circuits, four groups of electric control switch circuits and a shielding driving circuit, wherein the shielding driving circuit is connected with the D-SUB connector through a shielding signal connecting wire; the input ends of the four groups of electric control switch circuits are connected with the D-SUB connector through an internal connecting bus respectively; the input end of each group of decoding circuit is connected with the output end of a group of electric control switch circuit respectively; the output ends of the four groups of decoding circuits are connected to the same flexible flat cable pin-shaped socket; and each SMA connector is connected to a group of electric control switch circuit. The switching system is ingenious in concept; the switching system of the conventional EIT system forms a subsystem independent from a data acquisition system, so that an electrode distribution parameter is reduced; and due to the adoption of novel switches and a shielding driving technology, the whole EIT system has the advantages of high imaging accuracy, high imaging speed, long service life, wide working frequency range and the like.

Description

technical field [0001] The invention relates to a switch system, in particular to a switch system for electrical impedance tomography. Background technique [0002] Electrical impedance tomography (Electrical Impedance Tomography, EIT) is a non-invasive technique that aims at the electrical resistivity distribution inside the human body to reconstruct tissue images in the body. The human body is a large bioelectrical conductor, and each tissue and organ has a certain impedance. When a local organ of the human body becomes diseased, the impedance of the local part must be different from that of other parts. Make a diagnosis. 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, and is easily accepted by doctors and patients. However, the imaging accuracy of EIT is relatively low. Due to the high data acquisition and...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a switch system for electrical impedance tomography, which solves the problems of crosstalk, distortion, leakage, noise and capacitive effect in the current electronic switch system, which cause the data accuracy and maximum operating frequency of the EIT system to be inconsistent. high problem

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