CUED Publications database

Accurate real-time feedback of surface EMG during fMRI.

Ganesh, G and Franklin, DW and Gassert, R and Imamizu, H and Kawato, M (2007) Accurate real-time feedback of surface EMG during fMRI. J Neurophysiol, 97. pp. 912-920. ISSN 0022-3077

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Abstract

Real-time acquisition of EMG during functional MRI (fMRI) provides a novel method of controlling motor experiments in the scanner using feedback of EMG. Because of the redundancy in the human muscle system, this is not possible from recordings of joint torque and kinematics alone, because these provide no information about individual muscle activation. This is particularly critical during brain imaging because brain activations are not only related to joint torques and kinematics but are also related to individual muscle activation. However, EMG collected during imaging is corrupted by large artifacts induced by the varying magnetic fields and radio frequency (RF) pulses in the scanner. Methods proposed in literature for artifact removal are complex, computationally expensive, and difficult to implement for real-time noise removal. We describe an acquisition system and algorithm that enables real-time acquisition for the first time. The algorithm removes particular frequencies from the EMG spectrum in which the noise is concentrated. Although this decreases the power content of the EMG, this method provides excellent estimates of EMG with good resolution. Comparisons show that the cleaned EMG obtained with the algorithm is, like actual EMG, very well correlated with joint torque and can thus be used for real-time visual feedback during functional studies.

Item Type: Article
Uncontrolled Keywords: Adult Algorithms Artifacts Brain Electromagnetic Fields Electromyography Feedback Humans Joints Magnetic Resonance Imaging Male Movement Muscle Contraction Muscle, Skeletal Time Factors Torque Visual Perception
Subjects: UNSPECIFIED
Divisions: Div F > Computational and Biological Learning
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:30
Last Modified: 10 Mar 2014 17:35
DOI: 10.1152/jn.00679.2006

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