Improved Spatial Resolution of Electroencephalogram Using Tripolar Concentric Ring Electrode Sensors
Improved Spatial Resolution of Electroencephalogram Using Tripolar Concentric Ring Electrode Sensors
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DOI：
10.1155/2020/6269394
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发表时间：
2020-06-08
影响因子：
1.9
通讯作者：
Besio, Walter
中科院分区：
文献类型：
--
作者：
Liu, Xiang;Makeyev, Oleksandr;Besio, Walter
脑电图（EEG）被广泛应用于脑活动的研究和脑疾病的诊断。虽然EEG提供毫秒或更小的良好时间分辨率，但它不提供良好的空间分辨率。空间分辨率差的主要原因有两个：头部体积导体的模糊效应和差的信噪比。我们已经开发了一个三极同心环电极（TCRE）拉普拉斯传感器，现在报告的计算机模拟比较传统的EEG盘电极传感器和TCRE拉普拉斯传感器之间的空间分辨率。我们还进行了视觉诱发刺激实验，并从健康的人类受试者获得视觉诱发电位（VEPs）。从模拟中，我们发现TCRE拉普拉斯传感器可以提供大约十倍的空间分辨率提高，并通过来自特定体积的信号。将TCRE传感器放置在感兴趣的大脑区域附近将允许想要的信号通过并拒绝远处的干扰信号。我们还能够检测头皮表面上的VEP，并表明TCREs比传统的圆盘电极更好地分离VEP源。
The electroencephalogram (EEG) is broadly used for research of brain activities and diagnosis of brain diseases and disorders. Although EEG provides good temporal resolution of millisecond or less, it does not provide good spatial resolution. There are two main reasons for the poor spatial resolution: the blurring effects of the head volume conductor and poor signal-to-noise ratio. We have developed a tripolar concentric ring electrode (TCRE) Laplacian sensor and now report on computer simulations comparing spatial resolution between conventional EEG disc electrode sensors and TCRE Laplacian sensors. We also performed visual evoked stimulus experiments and acquired visual evoked potentials (VEPs) from healthy human subjects. From the simulations, we found that TCRE Laplacian sensors can provide approximately a tenfold improvement in spatial resolution and pass signals from specific volumes. Placing TCRE sensors near the brain region of interest will allow passage of the wanted signals and rejection of distant interference signals. We were also able to detect VEPs on the scalp surface and show that TCREs separated VEP sources better than conventional disc electrodes.