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Integration of EEG and SPECT data acquired from simultaneous examinations

Kowalczyk M., Bajera A., Goszczynska H., Zalewska E., Krolicki L.

Biocybernetics and Biomedical Engineering

2013

Vol. 33, no. 4

196--203

The aim of this study was to develop a convenient method for superimposing SPECT images and EEG maps. This work was performed as part of research concerning feasibility of improving the localization of epileptic foci comparing to the standard SPECT examination by applying the technique of EEG mapping. The described method relies on making five EEG electrodes visible in SPECT images, calculating the coordinates of these electrodes in SPECT image space, approximating the coordinates of the remaining electrodes used in EEG recording and then computing a sequence of 3D EEG maps spanning on all the electrodes. An example of visualization of EEG and SPECT data integration was presented. The maximum error of the five base electrodes location was assessed below 10 mm. Assuming the exact placement of the base electrodes the accuracy of the proposed method was estimated below 5.5 mm.

Goszczynska H., Doros M., Kowalczyk L., Zalewska E., Kolebska K.

Machine Graphics and Vision

2011

Vol. 20, No. 1

73-92

The aim of this study has been to develop a method to indicate the similar sequences of electroencephalographic (EEG) maps in a series. A method for the analysis of sequence similarity using the matrix of correlation coefficients for each pair of the EEG maps in the series has been proposed. The results for two series of EEG maps for seizure activity episodes and for activity before, during and after the seizure episode are presented. Analysis of images of the correlation coefficients matrices has allowed us to determine the characteristic features of the areas in these matrices corresponding to the assumed similarity relations, and to indicate the sequences fulfilling these relationships.