Title :
Can dipole modelling be improved by removing muscular and ocular artifacts from ictal scalp EEG?
Author :
Hallez, Hans ; De Vos, Maarten ; Phlypo, Ronald ; Vanrumste, Bart ; Van Hese, Peter ; D´Asseler, Yves ; Van Paesschen, Wim ; Van Huffel, Sabine ; Lemahieu, Ignace
Author_Institution :
Dept. of Electron. & Inf. Syst., Ghent Univ.
Abstract :
Muscle artifacts and eye movement artifacts distort the EEG and make EEG dipole source localization near the ictal onset of the seizure very difficult and unreliable. Recently, two algorithms to remove these artifacts have been developed and validated. In our study we want to investigate if the multiple dipole model can be used in ictal EEG source localization. Furthermore, we want to investigate whether the use of the dipole model returns better interpretable results when artifacts are suppressed. The EEG dipole source localization was done by using the RAP-MUSIC algorithm. We used the relative residual energy as a goodness of fit for the dipole model. We found that in the unfiltered EEG the relative residual energy was very high, indicating that EEG dipole source localization is heavily affected by the noise. By removing the artifacts, we obtain a lower relative residual energy, which suggests that the multiple dipole model becomes an adequate model for EEG dipole source localization during ictal period.
Keywords :
electroencephalography; muscle; RAP-MUSIC algorithm; dipole modelling; electroencephalography; eye movement artifact; ictal EEG dipole source localization; ictal period; ictal scalp EEG; multiple dipole model; muscle artifact; muscular artifact; ocular artifact; Brain modeling; Electroencephalography; Epilepsy; Focusing; Independent component analysis; Muscles; Neural engineering; Scalp; Source separation; USA Councils;
Conference_Titel :
Neural Engineering, 2007. CNE '07. 3rd International IEEE/EMBS Conference on
Conference_Location :
Kohala Coast, HI
Print_ISBN :
1-4244-0792-3
Electronic_ISBN :
1-4244-0792-3
DOI :
10.1109/CNE.2007.369659