Multi-frequency impedance imaging system

Abstract

The invention discloses a multi-frequency impedance imaging system. The system mainly performs imaging according to different impedances displayed by biological tissue under various frequencies. The system comprises a data collecting card, a voltage to current circuit, a multi-way switch circuit, a to-be-tested object, a signal amplification circuit and a computer. The system is of a virtual instrument structure and is formed by combining a LabVIEW platform with the data collecting card and pheripheral hardware, the data collecting card with the high precision is used, the system testing precision and stability are improved, the advantages of flexibility and convenience of the virtual instrument technology building system are brought into full play, and the system is convenient to expand. Drive signals adopt mixing signals stacked by multiple frequency sinusoidal signals, the multi-frequency signals are injection into a physical model at a time, measured voltage signals are processed to obtain voltage information under each frequency, and therefore the system imaging speed is increased.

Description

technical field [0001] The invention relates to a novel non-invasive biomedical detection and imaging technology, in particular to a multi-frequency electrical impedance imaging system. Background technique [0002] In recent years, electrical impedance imaging technology, as a new type of imaging detection technology, has attracted extensive attention from the international academic community due to its characteristics of non-invasive, non-radiation, low cost, and rich information, and has shown a good application prospect. By applying a small excitation current to the driving electrodes around the measured object, and then measuring the voltage information distributed around the target, and reconstructing the impedance image that can reflect the physiological and pathological changes of the object. [0003] In the early 1980s, Barber and Brown of the University of Sheffield in the United Kingdom began to study EIT technology and built a complete EIT hardware system for the...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of low imaging resolution, real-time imaging, and imaging artifacts in the electrical impedance imaging process of the prior art, the present invention provides a multi-frequency electrical impedance imaging system, which utilizes the electrical impedance spectrum characteristics of biological tissues, adopts Mix rate excitation signal, collect voltage signals at different frequencies, and perform imaging after weighted subtraction of multiple frequency signals

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