Removal of Pulse Artefact from EEG Data Recorded in MR Environment at 3T. Setting of ICA Parameters for Marking Artefactual Components: Application to Resting-State Data

• Published in: PloS one Vol. 9; no. 11; p. e112147
• Main Authors: Maggioni, Eleonora, Arrubla, Jorge, Warbrick, Tracy, Dammers, Jürgen, Bianchi, Anna M., Reni, Gianluigi, Tosetti, Michela, Neuner, Irene, Shah, N. Jon
• Format: Journal Article Web Resource
• Language: English
• Published: United States Public Library of Science 10.11.2014; Public Library of Science (PLoS)
• Subjects: Adult; Bioengineering; Biology and Life Sciences; Brain - physiology; Conservation; Data processing; EEG; Electroencephalography; Female; Functional magnetic resonance imaging; Human health sciences; Humans; Identification methods; Independent component analysis; Latency; Magnetic resonance; Magnetic Resonance Imaging; Male; Marking; Mathematical analysis; Medicine; Medicine and Health Sciences; Morlet wavelet; Neurosciences; NMR; Nuclear magnetic resonance; Physical Sciences; Psychotherapy; Reproducibility of Results; Research and Analysis Methods; Resonance; Rest; Sciences de la santé humaine; Signal Processing, Computer-Assisted; Spatial resolution; Time Factors
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0112147

Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) allow for a non-invasive investigation of cerebral functions with high temporal and spatial resolution. The main challenge of such integration is the removal of the pulse artefact (PA) that affects EEG signals recorded in the magnetic resonance (MR) scanner. Often applied techniques for this purpose are Optimal Basis Set (OBS) and Independent Component Analysis (ICA). The combination of OBS and ICA is increasingly used, since it can potentially improve the correction performed by each technique separately. The present study is focused on the OBS-ICA combination and is aimed at providing the optimal ICA parameters for PA correction in resting-state EEG data, where the information of interest is not specified in latency and amplitude as in, for example, evoked potential. A comparison between two intervals for ICA calculation and four methods for marking artefactual components was performed. The performance of the methods was discussed in terms of their capability to 1) remove the artefact and 2) preserve the information of interest. The analysis included 12 subjects and two resting-state datasets for each of them. The results showed that none of the signal lengths for the ICA calculation was highly preferable to the other. Among the methods for the identification of PA-related components, the one based on the wavelets transform of each component emerged as the best compromise between the effectiveness in removing PA and the conservation of the physiological neuronal content.