Device and measuring method for measuring multi-channel electrode/ scalp contact impedance in real time

Abstract

The invention discloses a device and measuring method for measuring multi-channel electrode / scalp contact impedance in real time, and belongs to the technical and application field of bioelectrical impedance imaging. The device includes a host computer, a main control unit, an excitation current signal generating unit, a boundary voltage signal measuring unit, an excitation channel, a measuring channel and a contact impedance measuring module. On the basis of an original imaging electrode, the device introduces a distal reference electrode. During the contact impedance measurement, a plurality of imaging electrodes are switched to contact impedance measurement circuits in order through an electrode channel control unit, and real-time synchronous measurement of boundary voltage data and contact impedance data can be realized through the electrode channel control unit. According to the method, accuracy measurement can be carried out to obtain information of the contact impedance in thefollowing two dimensions: 1, spatial consistency of the multi-channel contact impedance; and 2, time stability of single-channel contact impedance. Compared with a conventional measuring method, the measuring method of the invention is simple in operation and can carry out measurement in real time.

Description

technical field [0001] The invention belongs to the field of bioelectrical impedance imaging, in particular to a device and a measurement method for real-time measurement of multi-channel electrode / scalp contact impedance. Background technique [0002] Brain electrical impedance imaging technology is a new type of brain functional imaging technology, which has the advantages of non-invasive, non-radiation, fast imaging, and long-term continuous imaging. The basic principle is: use the electrodes pasted on the surface of the scalp to inject quantitative and safe AC current signals into the brain in sequence, measure the response voltage signals on each related electrode at the same time, and reconstruct the image that can respond to the brain through a specific image reconstruction algorithm. An image of the electrical impedance distribution inside the brain. [0003] The brain electrical impedance imaging system includes multiple imaging electrodes, usually 16 electrodes or...

AI Technical Summary

Problems solved by technology

Relevant studies have proved that when there is a large difference between the contact impedances of multiple imaging electrodes, measurement errors will be caused by affecting the performance of the signal acquisition system; during long-term continuous acquisition, when the contact impedance fluctuates greatly over time When , the imaging error is introduced in the differential imaging process

[0004] At present, the research on the influence of electrode / scalp contact impedance in brain electrical impedance imaging mostly stays in the stage of simulation research, and there is a lack of means to obtain the spatial consistency and temporal stability of multi-channel contact impedance in real time

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