FPGA-based portable electrical impedance imaging system and working method thereof

Abstract

The invention discloses an FPGA-based portable electrical impedance imaging system and a working method thereof. Imaging is mainly performed according to the characteristic of different conductivity of different biological tissue or the same biological tissue in different physiological states, and distribution information of conductivity in the tissue is reflected. A Red pitaya development board kit based on the ZYNQ series FPGA chip is adopted as the core, Red pitaya OS runs in embedded main control, and a board is loaded with a wireless / wired network module, a DDS signal generator, a signal conditioning module, an operational amplifier and filter circuit and a data acquisition circuit, and a voltage-controlled constant current source, a C51-based analog multiplexer with variable channel number and an electrode sensor are matched to be adopted as peripheral measurement equipment. High-precision, informationized and intelligent biological tissue information detection is realized by PC-side STEM lab development environment and Matlab software. A solution with high imaging quality, high accuracy rate and portability is provided by fully considering problems such as EMC.

Description

Technical field: [0001] The invention relates to a portable electrical impedance imaging system of biological tissues and a working method thereof, and particularly designs a portable electrical impedance imaging system based on FPGA. Background technique: [0002] Electrical impedance imaging (EIT) includes capacitance imaging (ECT) and electrical resistance imaging (ERT), which is widely used in industrial fields, especially for the detection of multiphase flow, while ERT is oriented to biomedical fields, especially It is various tumor examinations. The measurement method is a non-invasive inspection. The inspection process is: distribute electrode sensors around the biological tissue, inject a safe sinusoidal constant current excitation signal, and the excitation signal will generate an electric field after passing through the biological tissue, while different biological tissues or the same biological The different electrical conductivities of tissues in different physi...

AI Technical Summary

Problems solved by technology

[0003] Most of the electrical impedance measurement equipment currently on the market is bulky, complicated to operate, high in cost, and not portable, and only sensors with a fixed number of electrodes can be used for different measurement objects during the measurement process, while different measurement objects The design of the sensor is quite different

Traditional EIT equipment is difficult to adapt to different usage occasions, and its flexibility is poor, which is not conducive to improving imaging accuracy

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