Enhancement of Signal-to-noise Ratio of Peroneal Nerve Somatosensory Evoked Potential Using Independent Component Analysis and Time-Frequency Template

C. I. Hung, Y. R. Yang, R. Y. Wang, W. L. Chou, J. C. Hsieh, Y. T. Wu

研究成果: Conference contribution同行評審

摘要

This study aims to recover the somatosensory evoked potentials (SSEPs) from the smearing electroencephalography (EEG) recordings using independent component analysis (ICA) in conjunction with the proposed timefrequency SSEP template (TF-SSEP). The SSEPs induced from patients with the impaired motor functions exhibit longer latency and lower amplitude than the normal SSEPs and are inevitably contaminated by artifacts and environmental noise. Although ICA has been demonstrated as a novel technique to segregate the EEG into independent sources, the selection of task-related components needs to be further elaborated. The TF-SSEP template, generated by the Morelet wavelet transformation of the averaged SSEPs from three normal subjects, was used to automatically extract the SSEP-related features. The performance of the TF-SSEP template was further validated using EEGs through the left and right peroneal nerve stimulation of four stroke patients. After ICA decomposition, the sources were selected for reconstruction if their correlation coefficients with the TF-SSEP template were higher than the predetermined threshold. On the other hand, the unselected sources were considered as the event-unrelated components or artifacts. Among all patients, the topography maps at four peak times, namely P40, N45, P60 and N75, showed higher contrast in the vicinity of the foot-associated motor area, and the resolved SSEPs demonstrated uncontaminated waveforms in comparison with the conventionally averaging method. This indicated that the proposed method can remarkably suppress artifacts and effectively extracted the SSEP-related features.

原文English
主出版物標題13th International Conference on Biomedical Engineering - ICBME 2008
頁面718-721
頁數4
DOIs
出版狀態Published - 2009
事件13th International Conference on Biomedical Engineering, ICBME 2008 - , Singapore
持續時間: 3 12月 20086 12月 2008

出版系列

名字IFMBE Proceedings
23
ISSN(列印)1680-0737

Conference

Conference13th International Conference on Biomedical Engineering, ICBME 2008
國家/地區Singapore
期間3/12/086/12/08

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