Lokalisierung von EEG-Potentialen unter Berücksichtigung der unterschiedlichen Montagetypen

Abstract

This article aims to outline the principles of localizing scalp EEG potentials using different EEG montages.

Localization of potentials plays a critical role in the clinical EEG interpretation and is based on visual pattern recognition (e. g. epileptiform potentials) and on correct identification of their polarity.

In digital EEG recording of EEG signals is performed using a referential derivation, and the recorded signal can be reformatted to different, user-defined montages.

Montages are logical and orderly arrangements of EEG channels (i. e. the output of electrode pairs, with a trace representing the amplified potential difference between the two electrodes) that display EEG activity over the entire scalp and allow interpretation of recorded signals of different brain regions.

Montages are divided into two large groups, referential and bipolar, denoting the technique by which EEG data are displayed.

The article presents different montage types (bipolar, referential, average reference, Laplacian montage). Advantages and limitations of different montages for localization techniques are discussed.

Topographic analysis and field mapping of EEG potentials are demonstrated in examples.