Conversion device and conversion method for electroencephalogram record references

Abstract

The invention provides a conversion device and a conversion method for electroencephalogram record references; the conversion device and the conversion method are used for converting references of the left ear and the right ear into a uniform infinite reference respectively, and belong to the technical field of biological information. The conversion method provided by the invention is implemented by the following steps of determining spatial positions of electroencephalogram collection electrodes, a to-be-detected head model and equivalent distributed source model information; computing transfer matrixes G and Glr by a boundary element method; computing generalized inverse Glr+ of Glr by a singular value decomposition method, and computing a standardized matrix Rlr according to Rlr=GGlr+; finally, working out electroencephalogram data V minute=Rlr/Vlr taking an infinite point as the uniform reference according to original electroencephalogram data Vlr respectively referenced by the left ear and the right ear. Compared with previous methods, the conversion method has the advantages that the influence brought to electroencephalograms by the electrode movement of the left ear and the right ear in original record data can be eliminated; meanwhile, signals of the electrodes of the left ear and the right ear and proximity electrodes are reduced, and therefore unprecedented exchange between bipolar lead and unipolar lead is realized.

Description

technical field [0001] The invention belongs to the technical field of biological information, and in particular relates to a conversion device and a conversion method of an EEG reference electrode. Background technique [0002] EEG mainly studies the electrophysiological activities in the process of brain information processing by measuring the electromagnetic field generated by the neural electrical activity in the brain, and usually uses characteristics such as polarity, scalp area, frequency spectrum, latency, and voltage amplitude to describe and reflect different neural sources. Various specific EEG components of activity. In order to accurately measure these characteristics of EEG components, the ideal situation is to select potential inactive electrodes as reference for measurement. But in practice only the potential difference can be detected, so it is unavoidable to set the reference electrode during the scalp recording measurement. There are two types of common ...

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Problems solved by technology

However, this method mainly solves the problem of standardization of EEG recordings with a single electrode as a reference, while multi-electrode references (such as figure 1 example), so the above method cannot be directly introduced into the study of clinical EEG data

The biggest disadvantage of using multi-electrode reference in clinical EEG detection is that once the acquisition is completed, the data obtained by using different reference electrodes, although they all come from the same brain, become an "island" that cannot be linked, because there is no relevant technology at present. Then convert it into a common reference, which seriously affects the subsequent in-depth analysis of the data

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