FACET is a modular toolbox for the fast and flexible correction and evaluation of imaging artefacts of concurrently recorded EEG datasets. FACET is implemented in Matlab and relies on the EEGLAB data structure (Delorme & Makeig 2004). The whole toolbox consists of a "Correction" and an "Evaluation" part. Within the "Correction" framework a selection of various algorithms for correcting imaging induced artefacts are provided: average artefact subtraction (AAS) (Allen et al. 2000), PCA based (Niazy et al. 2005) and adaptive template approaches (van der Meer et al. 2010; Moosmann et al. 2009).

Additionally, various pre- and post-processing steps are implemented like volume onset detection, sub-sample alignment or OBS and ANC. All steps are implemented in a modular fashion to allow flexible combinations of different approaches. The "Evaluation" part of FACET allows to assess the quality of the chosen correction approach and to compare different settings.

Requirements

FACET relies on the EEGLAB data structure (Delorme & Makeig 2004) available at http://sccn.ucsd.edu/eeglab/. To run the example scripts, one also needs to install the FASTR algorithm (Niazy et al. 2005) available as an EEGLAB plugin at http://www.fmrib.ox.ac.uk/eeglab/fmribplugin.

Documentation

The Toolbox is extensively explained in the book fMRI Artifact Correction in EEG and EMG Data: Introducing FACET: A Flexible Artifact Correction and Evaluation Toolbox for EEG/fMRI Data and in my diploma thesis doc/thesis.pdf. Please see src/README for more information.

Additional documentation with sample scripts implementing the most common algorithms can be found in Glaser et al. (2013).

Citing the toolbox

While FACET is free software provided under the GPL we would like to ask those who use this software and find it useful to refer it as "FACET - a flexible artifact correction and evaluation toolbox for concurrently recorded EEG/fMRI data provided by the Medical University of Vienna, Department of Neurology" and cite it as:

Glaser, J., Beisteiner, R., Bauer, H., & Fischmeister, F. P. S. (2013). FACET - a "Flexible Artifact Correction and Evaluation Toolbox" for concurrently recorded EEG/fMRI data. BMC neuroscience, 14(1), 138. doi:10.1186/1471-2202-14-138, http://www.biomedcentral.com/1471-2202/14/138.

License

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version the terms of the GNU General Public License (GPL) to provide powerful collaboration, review, and code management of possible future extensions.

References

• Allen PJ, Josephs O, Turner R: A method for removing imaging artifact from continuous EEG recorded during functional MRI. NeuroImage 2000, 12(2):230-239.
• Delorme A, Makeig S: EEGLAB: an open source toolbox for analysis of single-trial EEG dynamics including independent component analysis. JNeurosciMethods 2004, 134:9-21.
• Glaser, J., Beisteiner, R., Bauer, H., & Fischmeister, F. P. S. (2013). FACET - a "Flexible Artifact Correction and Evaluation Toolbox" for concurrently recorded EEG/fMRI data. BMC neuroscience, 14(1), 138.
• Niazy RK, Beckmann CF, Iannetti GD, Brady JM, Smith SM: Removal of FMRI environment artifacts from EEG data using optimal basis sets. NeuroImage 2005, 28(3):720-737.
• Moosmann M, Schönfelder V, Specht K: Realignment parameter-informed artefact correction for simultaneous EEG-fMRI recordings. NeuroImage 2009, 45(4):1144-1150.
• Van Der Meer JN, TijssenMAJ, Bour LJ, Rootselaar AFV, Nederveen AJ, van der Meer JN, van Rootselaar AFF: Robust EMG-fMRI artifact reduction for motion (FARM). Clin Neurophysiol Official J Int Fed Clin Neurophysiol 2010, 121(5):766-776.