A DC attenuator allows common EEG equipment to record fullband EEG, and fits fullband EEG into standard European Data Format

作者：Kemp Bob^*; van Beelen Teunis; Stijl Marion; van Someren Paul; Roessen Marco; van Dijk J Gert

来源：Clinical Neurophysiology, 2010, 121(12): 1992-1997.

DOI：10.1016/j.clinph.2010.05.006

• EEG
• Fullband EEG
• DC EEG
• European Data Format
• EDF
• Filtering
• Inverse filter
• Analysis
• EEG analysis

Objective: Traditional electroencephalogram (EEG) recorders reject low frequencies and DC and therefore cannot handle fullband EEG. Dedicated fullband recorders use non-standard file formats, because the standard format (EDF) cannot handle large DC electrode offset voltages. Both facts limit the development and use of fullband EEG. We developed a modification that allows conventional equipment to record fullband EEG, and adapts both types of recorders to EDF.
Methods: The modification is a simple filter that attenuates the DC component and thus makes the EEG fit within traditional equipment limitations and EDF. The review software automatically 'de-attenuates' the DC component, without loss of information.
Results: DC attenuation by a factor of 10 made both types of recorders store DC attenuated fullband EEG into EDF files. Recordings were made during 0.5-24 h in 46 subjects. The DC de-attenuator automatically reconstructed the original fullband EEG within an amplitude range of +/- 100 mV and with a resolution of 0.3 mu V. Using sintered Ag-AgCl electrodes attached with common procedures, reconstructed DC EEG in spontaneously moving subjects ranged between +/- 32 mV.
Conclusions: The modification works. Fullband recordings can now be analyzed by independent software, archived and exchanged.
Significance: Any EEG system can be made to record fullband EEG into standard EDF.

• 出版日期2010-12