Epileptic seizure detection in EEGs using time-frequency analysis

  • Authors:
  • Alexandros T. Tzallas;Markos G. Tsipouras;Dimitrios I. Fotiadis

  • Affiliations:
  • Department of Material Science and Technology, University of Ioannina and Department of Medical Physics, Medical School, University of Ioannina, Ioannina, Greece;Department of Material Science and Technology, University of Ioannina, Ioannina, Greece;Department of Material Science and Technology, University of Ioannina and Biomedical Research Institute, Foundation for Research and Technology-Hellas, Ioannina, Greece

  • Venue:
  • IEEE Transactions on Information Technology in Biomedicine - Special section on computational intelligence in medical systems
  • Year:
  • 2009

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Abstract

The detection of recorded epileptic seizure activity in EEG segments is crucial for the localization and classification of epileptic seizures. However, since seizure evolution is typically a dynamic and nonstationary process and the signals are composed of multiple frequencies, visual and conventional frequency-based methods have limited application. In this paper, we demonstrate the suitability of the time-frequency (t-f) analysis to classify EEG segments for epileptic seizures, and we compare several methods for t-f analysis of EEGs. Short-time Fourier transform and several t-f distributions are used to calculate the power spectrum density (PSD) of each segment. The analysis is performed in three stages: 1) t-f analysis and calculation of the PSD of each EEG segment; 2) feature extraction, measuring the signal segment fractional energy on specific t-f windows; and 3) classification of the EEG segment (existence of epileptic seizure or not), using artificial neural networks. The methods are evaluated using three classification problems obtained from a benchmark EEG dataset, and qualitative and quantitative results are presented.