A multi-frequency electrical impedance imaging device based on fpga

Abstract

The invention discloses a multi-frequency electrical impedance imaging device based on FPGA, comprising: FPGA processor, DA conversion circuit, differential current to single-end voltage circuit, voltage amplitude adjustment circuit, voltage control current source circuit, multi-way switch, Physical model, pre-high-pass filter circuit, differential amplifier circuit, variable gain amplifier circuit, program-controlled filter circuit, phase-sensitive demodulation circuit, AD conversion circuit and PC; the FPGA processor generates sine and cosine digital signals, which are converted into constant When the current source is used as the excitation current to select the excitation current channel through the multi-way switch, the physical model is input; the FPGA processor inputs the voltage signal generated by the collected physical model into the pre-high-pass filter circuit for filtering, and performs secondary amplification and program-controlled filtering in turn. And phase-sensitive demodulation, the electrical impedance imaging map of the object to be measured is obtained by the PC according to the digital signal processing. The invention overcomes the parameter error, can effectively carry out pertinent filtering on the collected voltage signal, and provides good precision.

Description

technical field [0001] The invention relates to an FPGA-based multi-frequency electrical impedance imaging device, which belongs to the technical field of medical detection equipment. Background technique [0002] Electrical Impedance Tomography (EIT) is one of the major research topics in bioinformatics and biomedical engineering today. It is a new generation of medical imaging technology that only appeared in the past 30 years after morphology and structure imaging. It has three outstanding advantages of functional imaging, non-injury and medical image monitoring. It is an ideal and attractive application prospect. Information detection and imaging means. Electrical impedance imaging is a new type of medical imaging technology based on the traditional CT idea, which takes the distribution of the internal resistivity (conductivity) of the organism as the imaging target. According to the phenomenon that different tissues in the organism have different impedances, it makes ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a multi-frequency electrical impedance imaging device based on FPGA, and solve the unavoidable parameter error caused by the phase shifter used in the hardware circuit design of the current imaging device, Reduced flexibility and inability to have better precision, design a multi-frequency electrical impedance imaging device with better real-time performance, higher data acquisition accuracy and resolution

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