Entropy features for focal EEG and non focal EEG
Introduction
Epilepsy is a neurological disorder in the present world today. This causes involuntary convulsion to the patient’s muscles and at times lead to loss of consciousness. In this world about 50 million people are living with epilepsy [[1], [2], [3], [4]].
Electroencephalogram (EEG) is widely used for various analysis of brain activity [[1], [2], [3], [5], [6]]. Epilepsy is clinically analysed using EEG. Some people with epilepsy become resistant to drugs and thus they need surgical removal of those parts of the brain which causes epilepsy to get rid of this disease. That portion of the brain which causes epileptic seizures is called as the epileptogenic foci. Such surgery is common in the present society now. The outcome of the surgery has successfully removed or significantly reduced the occurrence of the epileptic seizure in the patients [7]. Hence there is a precise need to find the exact region of the brain causing the epileptic seizures for surgical planning [8]. Presently locating the epileptogenic foci is being performed manually by the physician by clinical procedure which is subjective. This type of treatment is done in the case of partial epilepsy or partial seizures. In partial seizures, some portions of the brain are affected by the epileptic seizures and other portions are normal. In this context, FEEG is the EEG that is recorded from the brain areas where the first ictal EEG (seizure) changes were detected. And NFEEG is that EEG that is recorded from the brain areas that were not involved at the seizure onset [9].
Hence an automatic identification between these two signals – FEEG and NFEEG will assist doctors in identification of the epileptogenic foci for their surgical evaluation of the regions of the brain. In attempt to this, Bern Barcelona database [9] is considered and used it towards building algorithms for automatic classification of FEEG and NFEEG. In the literature, there are only a very few works who used this database for this purpose. The highest accuracy reported in the literature is 87% [10]). Here a simple method is presented in comparison to the existing methods that achieved the highest accuracy of 100%, 100% sensitivity and 100% specificity.
The paper is organized as follows. Section 2 presents the details of the data, brief information about the entropies used as features and the various classifiers which have used in this work. Section 3 presents the results obtained in this work. Section 4 presents a discussion on related studies of this database and compares our results with other methods and results in the literature. The conclusion is given in Section 5.
Section snippets
Methods and materials
This section describes the methods employed for automatic classification of FEEG and NFEEG.
Results
In this work, the features considered namely ApEn, SampEn, RE and FuzzyEn were applied directly to the raw EEG data from the database considered for the full length of samples i.e., 10, 240. Table 1 shows the mean and variance of these features calculated for 100 FEEG and 100 NFEEG data from the database. Table 1 also shows Student’s t-test p value for each of the features considered is very less than 0.0001 which shows that these features has strong discrimination for this dataset for
Discussion
Earlier also some of these entropy features have been applied to another famous database i.e., Bonn University database by few researchers [[1], [2], [3]] and they achieved accuracies as high as 98% and 99.7% [[1], [2], [3], [5]] for that database. In this work, a different combination of various entropy features was applied towards classification of FEEG and NFEEG for the Berlin Barcelona database and achieved the highest possible accuracy of 99%, sensitivity of 99% and specificity of 99%.
Conclusions
Epilespy is one of the common disorder of the population at large and a lot of people undergo surgical procedures in the brain to get rid of epilepsy − particularly for those who have drug resistant epilepsy. Locating the epileptogenic focus is one of the challenging task for the doctors which is very important as removing those portions of the brain helps the patient in totally recovering from the epilepsy disorder. In this work, a method using only simple entropy calculation measures is
N. Arunkumar is working as a faculty in SASTRA University since 2005. He specialization is in Biomedical Signal Processing. He has published several papers in International Peer reviewed journals. He has excelled in academics. His core area of research includes brain signals, clinical research and ayurvedic pulse signal processing.
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N. Arunkumar is working as a faculty in SASTRA University since 2005. He specialization is in Biomedical Signal Processing. He has published several papers in International Peer reviewed journals. He has excelled in academics. His core area of research includes brain signals, clinical research and ayurvedic pulse signal processing.
K. Ramkumar is working as faculty in SASTRA University for about 18 years. He research area is control systems, robotics and electric cars modeling. He has excelled in his academics and has been a pioneer in his research and published several research papers.
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