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. 2021 Apr 27:2021:6644365.
doi: 10.1155/2021/6644365. eCollection 2021.

Hybrid Convolutional Neural Network for Localization of Epileptic Focus Based on iEEG

Linfeng Sui  1   2 , Xuyang Zhao  2   3 , Qibin Zhao  2 , Toshihisa Tanaka  2   3 , Jianting Cao  1   2
Affiliations

Hybrid Convolutional Neural Network for Localization of Epileptic Focus Based on iEEG

Linfeng Sui et al. Neural Plast. .

Abstract

Epileptic focus localization by analysing intracranial electroencephalogram (iEEG) plays a critical role in successful surgical therapy of resection of the epileptogenic lesion. However, manual analysis and classification of the iEEG signal by clinicians are arduous and time-consuming and excessively depend on the experience. Due to individual differences of patients, the iEEG signal from different patients usually shows very diverse features even if the features belong to the same class. Accordingly, automatic detection of epileptic focus is required to improve the accuracy and to shorten the time for treatment. In this paper, we propose a novel feature fusion-based iEEG classification method, a deep learning model termed Time-Frequency Hybrid Network (TF-HybridNet), in which short-time Fourier transform (STFT) and 1d convolution layers are performed on the input iEEG in parallel to extract features of the time-frequency domain and feature maps. And then, the time-frequency features and feature maps are fused and fed to a 2d convolutional neural network (CNN). We used the Bern-Barcelona iEEG dataset for evaluating the performance of TF-HybridNet, and the experimental results show that our approach is able to differentiate the focal from nonfocal iEEG signal with an average classification accuracy of 94.3% and demonstrates an improved accuracy rate compared to the model using only STFT or one-dimensional convolutional layers as feature extraction.

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Conflict of interest statement

The authors declare that they have no conflicts of interest.

Figures

Figure 1
Figure 1
An example of the focal and nonfocal iEEG signal.
Figure 2
Figure 2
STFT of the focal and nonfocal iEEG signal.
Figure 3
Figure 3
An overview of architectures of TFCNN (a), Mixed-CNN (b), and TF-HybridNet (c).
Figure 4
Figure 4
The accuracy of the validation set on TFCNN, Mixed-CNN, and TF-HybridNet.
See this image and copyright information in PMC

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