癫痫病人脑电信号的奇异谱

癫痫是一种常见的神经系统疾患，其唯一客观证据为脑电图的癫痫样发放。在癫痫发作间期，仅有偶发的很难辨别的癫痫样放电，为了正确诊断癫痫病，往往需要医生长时间监测病人的脑电信号，在对脑电信号进行相空间重构，进而对其进行奇异系统分析，发现癫痫病人无论在癫痫发作前、发作中、发作后，其脑电信号的奇异谱曲线不存在噪声平台，明显区别于正常人。是否可以认为脑电信号的奇异谱正代表着大脑的一种基本状态，癫痫患者在未发作时，大脑的基本状态已经处于异常。无论如休，奇异系统分析方法使得可以利用很短的一段脑电数据诊断癫痫。无疑为癫痫病人的临床诊断提供了一条简单、有效的途径。

THE SINGULAR SPECTRUM OF EEG FROM EPILEPTIC PATIENTS

The diagnosis of epilepsy relies on an identification of epileptic spikes in EEG. However, between seizures it is difficult to identify such spikes in the EEG of an epileptic patient. Doctors have to supervise a long term of EEG to detect those spikes. In our study, we reconstruct EEG time series and find the singular spectra of epileptic patients are significantly different from the one of normal subjects, not only during the seizures , but also before,or after the seizures. We suggest that the singular spectrum of EEG may characterize the basic state of brain. It may provide a simple, effective method for epilepsy diagnosis.