Lege Artis Medicinae

[Mapping of EEG in neurological disorders]

SZIRMAI Imre1, JUHÁSZ Csaba2, SUREK György3, DOLOGH Ervin4

FEBRUARY 26, 1992

Lege Artis Medicinae - 1992;2(02)

[Mapping is a new way to convey the information of the mathematical analysis of the EEG in an immediately understandable form. In this article, the history of EEG mapping is surveyed. Sixteen channel EEG mapping system was programmed on an IBM-AT personal computer which constructs absolute and relative power spectra topograms on the scalp. Hemispheric asymmetry and long term changes of absolute and relative power estimates were calculated by statistical methods (Wilcoxon and Student t-test). In comparison traditional reading of the EEG the mapping has the following advantages: 1. it uses exact procedures instead of qualitative estimation; 2. in can detect minimal cortical damages; 3. it has the ability to store data for later comparison: the power ratios in selected frequency ranges proved to be a reliable indicator of post-ischemic restitution of EEG; 4. it can evaluate of event related reactions of bioelectric signals in higher resolution. EEG topography provides early information regarding the severity of ischemic lesions in the acute stage of stroke before to the CT scan can visualize the tissue hypodensity. In cases of permanent epileptic waves, the mapping visualizes the local power maxima of dominant frequency ranges and detects the post-ic talimpairment of cortical fields of epileptic foci. Probability significance mapping has reinstated the diagnostic value of EEG by the applica tion of the neuroimaging techniques.]

AFFILIATIONS

  1. Egyetemi Tanár
  2. Klinikai Gyakornok Pécsi Orvostudományi Egyetem Neurológiai Klinika
  3. Tanár, Matematikus
  4. Programozó Matematikus

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