Beyond the Double Banana

Abstract

The findings advocate for the use of these digital EEG technology-derived analysis methods in clinical practice.

Added clinical value of the inferior temporal EEG electrode chain

“…Peak negativity was defined as phase reversal in longitudinal and transversal bipolar montages, and maximum negative amplitude of the signals in common average montage. In addition, scalp-topography of the voltage distribution were visualized using voltage-maps (Rosenzweig et al 2014). In case of disagreement in scoring, this was resolved in joint reading sessions.…”

“…A previous study demonstrated that adding six electrodes in the inferior temporal chain to the 10-20 array, in the long-term video-EEG monitoring, significantly increased the accuracy of estimating the source of the ictal signals in patients with foci in the temporal lobe, as evaluated by a panel of trained experts (Rosenzweig et al 2014).…”

Ictal EEG source imaging in presurgical evaluation: High agreement between analysis methods

“…Five different source analysis methods were applied: phase-mapping (PM), dipole fitting, CLARA, cortical-CLARA and minimum norm estimation (MN). The analysis methods are described in detail elsewhere [12], [13]. Briefly:…”

“…By combining the real and imaginary peak FFT coefficients at different phase angles, phase maps were calculated, i.e., voltage maps at various relative latencies by transforming phase into time [13], [15].…”

“…Several methods of ictal source imaging have been previously described and validated in clinical practice [7], [8], [9], [10], [11], [12], [13]. However, it is not known to what extent the different methods lead to the same source location, and which is the best approach for localizing ictal sources.…”