A high-precision data acquisition system for electrical impedance imaging
A data acquisition system and electrical impedance imaging technology, applied in the measurement of resistance/reactance/impedance, application, measurement of electrical variables, etc., can solve problems affecting system stability, self-excited oscillation of the measurement system, and difficulty in adapting to the requirements of broadband systems , to achieve the effect of improving usability, improving performance, and ensuring convenience
Active Publication Date: 2017-05-17
FOURTH MILITARY MEDICAL UNIVERSITY
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0006] Aiming at the influence of the shunt effect of distributed parameters on the excitation current, some studies have proposed to connect a negative impedance generator in parallel with the output of the current source to generate negative impedance loads that are equal in size and opposite in direction to these distributed parameters, and neutralize the influence of distributed parameters. However, on the one hand, the negative impedance generator can only be neutralized for a fixed frequency, and it is difficult to adapt to the requirements of the broadband system. On the other hand, it will seriously affect the stability of the system, which will easily lead to the measurement system problem of self-oscillating oscillations, and thus has not been widely accepted
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0062] The technical idea of the present invention is that a programmable current source is used to generate excitation current, and the excitation and measurement electrodes are selected through the electrode interface module, so that the excitation current is injected into the measured target area and the response voltage signal is measured through the voltage amplifier; The intensity of the current flowing out of the target area, and adjust the output amplitude of the current source according to the measured results; finally, the accurate extraction of the measured impedance information is realized through digital demodulation and correlation calculation of the response voltage and the detection current.
[0063] 1. Working principle
[0064] In theory, there are two methods of electrical impedance measurement: one is the voltage excitati...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A high-precision data collection system for electrical impedance imaging. The system is constructed by a main control module, a programmable current source, an electrode interface module, a voltage measurement module, a current detection module, a digital demodulation module, a communication interface module and the like. Excitation currents in an imaging target region are accurately regulated and controlled through the current detection module and the programmable current source, distribution differences are effectively suppressed through an electrode selection switch system in the electrode interface module, external interference is effectively blocked through an electrode wire double-shielding system in the electrode interface module, and coherent demodulation of response signals and excitation signals is achieved through the digital demodulation module. Therefore, the influence of distribution parameters and external interference in the data collection system for electrical impedance imaging can be effectively suppressed, nonlinear errors of a measurement result are reduced, the signal to noise ratio of measured data is increased, the key problem that it is difficult to further improve data collection accuracy in the electrical impedance imaging research is solved, and high application value is achieved.
Description
technical field [0001] The invention belongs to the technical field of electrical impedance imaging, and relates to an electrical impedance imaging data acquisition technology, in particular to a data acquisition system for electrical impedance imaging. The system realizes the accurate collection of electrical impedance information through the feedback control of the excitation current, the reasonable design of the electrode interface and the accurate demodulation of the measured impedance information, so as to meet the requirements of electrical impedance imaging. Background technique [0002] Electrical impedance imaging technology is based on the fact that different biological tissues have different resistivity characteristics, and changes in pathophysiological functions will also significantly change the characteristics of tissue electrical impedance characteristics. It is a new type of medical imaging technology that uses completely non-invasive alternating current, mea...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityPatents(China)
IPC IPC(8): G01R27/14
CPCA61B5/053G01R27/14
Inventor史学涛董秀珍尤富生季振宇付峰刘锐岗徐灿华杨滨代萌李靖
OwnerFOURTH MILITARY MEDICAL UNIVERSITY