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Results: 3

1.
Fig. 3

Fig. 3. From: Magnetoencephalography's higher sensitivity to epileptic spikes may elucidate the profile of electroencephalographically-negative epileptic seizures.

Spike amplitude of a MEG sensor is defined from baseline to peak.

Yosuke Kakisaka, et al. Epilepsy Behav. 2012 February;23(2):171-173.
2.
Fig. 1

Fig. 1. From: Magnetoencephalography's higher sensitivity to epileptic spikes may elucidate the profile of electroencephalographically-negative epileptic seizures.

Axial T2- weighted image (3 Tesla) indicates a subtle blurring of the gray-white matter junction suggesting malformation of cortical development in the right orbitofrontal gyrus (white arrow).

Yosuke Kakisaka, et al. Epilepsy Behav. 2012 February;23(2):171-173.
3.
Fig. 2

Fig. 2. From: Magnetoencephalography's higher sensitivity to epileptic spikes may elucidate the profile of electroencephalographically-negative epileptic seizures.

Upper Column EEG and MEG waveforms and dipole analysis of the spikes. The set of spikes exemplified by the discharge enclosed by the broken line and labeled as #1 were detected with MEG only (MEG unique) whereas the set labeled as #2 are typical of those that were detected with both EEG and MEG (EEG/MEG spike)
Lower column: A magnified spike waveform, MEG contour map, and spike dipole source locations on the patient’s individual MRI for spikes #1 and 2 are shown. MEG contour maps: Arrows on the contour maps reflect the estimated dipoles projected to the sensor surface. The solid line indicates the efflux of the magnetic field from the head surface, and the broken line indicates influx of the magnetic field into the head. MRI: The circle and bar on the MRI scans indicate the dipole location and orientation, respectively. Note that the patient has two types of spikes: MEG unique spikes (#1) and EEG/MEG spikes (#2). Spike dipoles of both are estimated on the same area, the right orbito-frontal area, where an axial T2- weighted image (3 Tesla) indicates as abnormal.

Yosuke Kakisaka, et al. Epilepsy Behav. 2012 February;23(2):171-173.

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