期刊
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
卷 127, 期 -, 页码 114-125出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.cmpb.2016.01.018
关键词
Simultaneous EEG-fMRI; Ballistocardiogram artifacts; Real-time optimal basis sets
类别
资金
- National Natural Science Foundation of China [6121001, 61571047, 31400973]
- State Key Laboratory of Networking and Switching Technology (Beijing University of Posts and Telecommunications) [SKLNST-2013-1-03]
- Fundamental Research Funds for the Central Universities
- Renmin University of China [14XNLF11, 15XNQ037, 15XNLQ05]
Background: The simultaneous acquisition of electroencephalogram (EEG) and functional magnetic resonance imaging (fMRI) provides both high temporal and spatial resolution when measuring brain activity. A real-time analysis during a simultaneous EEG-fMRI acquisition is essential when studying neurofeedback and conducting effective brain activity monitoring. However, the ballistocardiogram (BCG) artifacts which are induced by heartbeat-related electrode movements in an MRI scanner severely contaminate the EEG signals and hinder a reliable real-time analysis. New method: The optimal basis sets (OBS) method is an effective candidate for removing BCG artifacts in a traditional offline EEG-fMRI analysis, but has yet to be applied to a real-time EEG-fMRI analysis. Here, a novel real-time technique based on OBS method (rtOBS) is proposed to remove BCG artifacts on a moment-to-moment basis. Real-time electrocardiogram R-peak detection procedure and sliding window OBS method were adopted. Results: A series of simulated data was constructed to verify the feasibility of the rtOBS technique. Furthermore, this method was applied to real EEG-fMRI data to remove BCG artifacts. The results of both simulated data and real EEG-fMRI data from eight healthy human subjects demonstrate the effectiveness of rtOBS in both the time and frequency domains. Comparison with existing methods: A comparison between rtOBS and real-time averaged artifact subtraction (rtAAS) was conducted. The results suggest the efficacy and advantage of rtOBS in the real-time removal of BCG artifacts. Conclusions: In this study, a novel real-time OBS technique was proposed for the real-time removal of BCG artifacts. The proposed method was tested using simulated data and applied to real simultaneous EEG-fMRI data. The results suggest the effectiveness of this method. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
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