基于脑电单通道与多通道特征融合的致痫灶定位算法
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1.天津大学;2.天津工业大学;3.上海交通大学医学院附属瑞金医院脑病中心;4.天津职业技术师范大学

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R741.044

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国家自然科学基金项目


Epileptogenic Zone Localization Algorithm Based on Single-Channel and Multi-Channel EEG Feature Fusion
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National Natural Science Foundation of China

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    摘要:

    癫痫患者通常依赖致痫灶切除手术控制病情发作,而致痫灶精准定位是手术成功的关键.前期定位算法多基于单通道脑电时序特征,忽视了脑区间的相互作用,导致空间信息利用不足.本文基于23名癫痫患者的立体定向脑电图(SEEG)数据,采用一维卷积长短时记忆模型(Conv1D-LSTM)融合单通道与多通道特征进行致痫灶定位.该方法首先提取单通道SEEG的时域、频域和非线性特征,然后分别基于锁相值、转移熵和广义定向相干性构建脑功能网络并提取其图论特征.随后,将上述特征输入到Conv1D-LSTM模型,以融合时空信息进行致痫灶定位.结果表明,相较于单独使用单通道或多通道特征,基于两种特征融合的Conv1D-LSTM在SEEG数据集上达到93.31%的定位准确率.消融实验表明,脑网络图论特征在致痫灶定位中的作用大于单通道特征,并且双重注意力机制能显著提升定位性能.对比实验显示,Conv1D-LSTM性能优于支持向量机、卷积神经网络、时域卷积网络和双向LSTM等主流模型.本文研究为临床上精确定位致痫灶提供了新的辅助方法.

    Abstract:

    Epilepsy patients typically rely on resection surgery of the epileptogenic zone (EZ) to control seizure recurrence, and precise EZ localization is crucial for surgical success. Previous localization algorithms primarily relied on temporal features of single-channel electroencephalogram (EEG) signals, overlooking interactions between brain regions and resulting in insufficient utilization of spatial information. Based on stereotactic EEG (SEEG) data of 23 epilepsy patients, this study applies a one-dimensional convolutional and long short-term memory hybrid model (Conv1D-LSTM) to fuse single-channel and multi-channel features for EZ localization. The method first extracts time-domain, frequency-domain, and nonlinear features from single-channel SEEG signals. Then, it constructs brain functional networks during epileptic seizures based on phase locking value (PLV), transfer entropy (TE), and generalized partial directed coherence (GPDC), respectively. Graph theory features are extracted from each network, and statistical analysis is conducted to determine whether significant differences exist between epileptogenic and non-epileptogenic channels across the aforementioned features. Subsequently, these features are applied to the Conv1D-LSTM to integrate spatiotemporal information for EZ localization. Experimental results demonstrate that compared to using either single-channel or multi-channel features alone, the Conv1D-LSTM based on the fusion of both features achieves a localization accuracy of 93.31% on the SEEG dataset. Ablation experiments show that the graph-theoretic features of brain networks play a more significant role in the localization of EZ than single-channel features, and the dual-attention mechanism significantly improves the localization performance. Comparative experiments show that Conv1D-LSTM outperforms mainstream models such as support vector machine, convolutional neural network, temporal convolutional network, and bidirectional LSTM. This study provides a novel auxiliary tool for the precise EZ localization in clinics.

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  • 收稿日期:2025-09-27
  • 最后修改日期:2026-03-24
  • 录用日期:2026-03-25
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