Novel TiN-based dry EEG electrodes: Influence of electrode shape and number on contact impedance and signal quality

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

Fiedler, P (Author) Other; Brodkorb, S (Author) Other; C. Fonseca (Author) FEUP; Vaz, F (Author) Other; Zanow, F (Author) Other; Haueisen, J (Author) Other

Conference proceedings International

Title: IFMBE Proceedings

Pages: 418-421

12th Mediterranean Conference on Medical and Biological Engineering and Computing, MEDICON 2010

Chalkidiki, 27 May 2010 through 30 May 2010

Indexing

Scopus - 9 Citations

Other information

Authenticus ID: P-007-VRR

DOI: 10.1007/978-3-642-13039-7_105

Abstract (EN): Usability of conventional wet electrodes for electroencephalography (EEG) is depending on a set of requirements, including time consuming and complex preparation of the skin of a subject, thus limiting possible application. A new class of "dry" electrodes without the need for electrolyte gels or pastes is being investigated. The dry application scenario of these novel electrodes requires a stable and reliable contact with the subject's skin. In order to develop an electrode shape with large contact surface for low electrode-skin impedance while also ensuring a sufficient hair layer penetration, several studies were performed. In this paper a distinct titanium electrode substrate shape for titanium nitride (TiN) coated electrodes was analyzed regarding influences of the number of interconnected electrodes and contact surface on electrodeskin impedance and biosignal quality. As a result 10 interconnected TiN pins had the lowest impedance values of 14 to 55 k¿ (depending on signal frequency) in comparison to 2 to 44 k¿ using conventional Ag/AgCl electrodes. Also the mean average deviation (MAD) of 5 seconds long EEG episodes were computed. The lowest MADs of 2.00 to 2.25 ¿V were determined using three interconnected TiN pins. In comparison to MADs of 2.13 to 2.54 ¿V, using a second set of Ag/AgCl electrodes, this leads to the conclusion that most of the error was related to spatial distance. This first step in optimization of electrode shape for dry TiN based electrodes showed very promising results and enable their use for EEG acquisition. © 2010 International Federation for Medical and Biological Engineering.

Language: English

Type (Professor's evaluation): Scientific