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The stationary complex for EEG investigation is shown on the
picture. It includes 20-channel EEG-machine, photic stimulator, Pentium computer and color
printer.
On users request the system is additionaly completed with audiostimulator, laser printer,
the data archiving devices ZIP or CD-W, camera for videoimage monitoring and recording. |
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A compact 16-channel amplifier with
photic stimulator and Notebook with color display may be used as portable EEG-machine, which provides the recording
quality on the top-level stationary devices. |
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Neurokartograph version 4 is a 32-bit
multithread program for Windows 95/98 or NT. The program combines the powerfull set of functions for the mathematical
analysys of the EEG with the simple, intuitive clear interface. |
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During the process of the EEG
recording the user can executively
change the parameters of the amplifier
and stimulators by means of special control panel. |
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During the process of the EEG
recording the user can "scroll
back" the record, comparing on the
single screen the different epochs of the record. This for example may be usefull for the
visual analysis of the EEG structure changes during the functional test, such as the
hyperventilation. There also exists the
possibility to display on the screen two (and more) different records, and not only the
native curves but alse any kind of procession result. |
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The regular configuration contains 8
bipolar montages standard for the '10-20 % system'. The user can construct and save his
own configurations for the less number of channels, Yung system, averaged electrode ets.
The quantity of user-defined montages is not restricted. The process of montage edition is shown here. |
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One of the most significant methods
of the numeric procession of the EEG is the frequency
filtering. The software filtering during the data input gives the
opportunity to widen the list of possible values of the time constant and higher
frequency, increase the quality of the net rejection, without the complicated hardware
(and consiquently increased safety and decreased price). Recurring filtering of recorded
data, shown at the illustration, allows to reject the artifacts, appeared during the
record (electrode vibration and so on) and to pick out the separate rhythms (for example,
the picking out of the Delta-rhythm increases the accuracy of 3D localization of the
tumour by the BrainLoc) |
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The presentation of the momental
potentials values as the topographic maps - amplitude mapping - allows to track the dynamics and localize the sources of the
generation of the EEG activity. |
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Spectral
analysis of the EEG is most frequently
used in clinical practice. The analysis by the Fourieur method not only allows to quickly
and objectively calculate the rhythms indexes in the selected record sections , but also
to reveal the microchanges in the structure of the EEG activity. |
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The topographic maps of the power spectrum give the clear representation about the dominating rhythms and
there localization. The power maps in 4 standard bands are shown here: Delta, Theta, Alpha
and Beta. |
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Here is shown another example of the
usage of the method of
spectral mapping. Presented 6 maps,
calculated for the same frequency band 2-5 Hz in the different record parts shows the
dynamics and the localization of the epileptiformic activity source. |
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The number of publications devoted
the usage of the coherence
function in clinical practice is
increased during last years. The different
methods of the presentation of the results of the coherence analysis are realised in the
program: graphics, histograms, tables and topographic maps. |
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The data base allows to manage the card-index of the investigated patients,
to devide the records list into the groups, to sort by patients family, record date,
diagnosis and to quickly find on the any of field; export and import data to the standard
formats to process by other programs; backup data to ZIP or CD ets. |
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All procession results may be
displayed as the table of
values, written to ASCII file or exported
into Microsoft Excel. |
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The specially designed set of templates and macros allows to use the
powerfull editor Microsoft WinWord for semiautomatic forming
and printout of the conclusion. |
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