Active electrode design suitable for simultaneous EIT and EEG

作者：Gargiulo G D^*; Cohen G; McEwan A L; Oh T I; Mohamed A; Tapson J; Nguyen D T; van Schaik A; Wabnitz A

来源：Electronics Letters, 2012, 48(25).

DOI：10.1049/el.2012.3212

Presented is an active electrode design for electrical impedance tomography spectroscopy (EITS) which contains both current stimulation and sensing pathways, and also enables the simultaneous measurement of bio-potential signals (EEG/ECG). The entire circuit is manufactured on a small circular FR4 PCB with the bottom layer forming the electrode plate. A custom sealed plastic enclosure was designed and forms a classical %26apos;cup%26apos;-shaped scalp electrode to hold the conductive paste. The proposed design is of low power, drawing 8 mW when powered at 5 V, and provides a large bandwidth (20 MHz). It has a large input impedance (%26gt;10(10) [Omega] // 5 [pF]) and is low noise (%26lt;300 nV(pp) in the EEG bandwidth 0.1 divided by 10 [Hz] and of negligible noise figure in the EIT bandwidth %26gt;10 kHz). Performance was evaluated using a bench test (EIT image phantom) and in vivo recordings (EEG).

• 出版日期2012-12-6