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Maxfilter software v2

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MaxFilter software v2.2 is a tool designed to process and analyze data from magnetic resonance imaging (MRI) and magnetoencephalography (MEG) systems. The software's core function is to apply advanced signal processing techniques to enhance the quality and accuracy of the acquired data.

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2 protocols using maxfilter software v2

1

MEG Signal Cleaning and Artifact Removal

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A temporal variant of signal space separation using MaxFilter software v2.2 (Elekta-Neuromag, Helsinki, Finland) was applied to remove external magnetic interferences and discard noisy sensors (Taulu and Simola, 2006 (link)). The data were downsampled to 1 kHz, segmented into 1-sec epochs, and bandpass filtered (Butterworth with an order of 4) in a frequency range of 1 to 40 Hz. Epochs containing artifacts (SQUID jumps, eye blinks, head movement, or muscles) were removed by thresholding based on a variance exceeding 3×10−24 T, kurtosis larger than 15, and z-score larger than 4. Cardiac artifacts were removed using independent component analysis (ICA) based on the infomax algorithm (Bell and Sejnowski, 1995 (link)). On average (± SD), 8 ± 4.5 epochs (i.e., seconds) per run were removed across participants.
Youssofzadeh V., Conant L., Stout J., Ustine C., Humphries C., Gross W.L., Shah-Basak P., Mathis J., Awe E., Allen L., DeYoe E.A., Carlson C., Anderson C.T., Maganti R., Hermann B., Nair V.A., Prabhakaran V., Meyerand B., Binder J.R, & Raghavan M. (2022). Late dominance of the right hemisphere during narrative comprehension. NeuroImage, 264, 119749.
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2

MEG Signal Cleaning and Artifact Removal

Check if the same lab product or an alternative is used in the 5 most similar protocols
A temporal variant of signal space separation using MaxFilter software v2.2 (Elekta-Neuromag, Helsinki, Finland) was applied to remove external magnetic interferences and discard noisy sensors (Taulu and Simola, 2006 (link)). The data were downsampled to 1 kHz, segmented into 1-sec epochs, and bandpass filtered (Butterworth with an order of 4) in a frequency range of 1 to 40 Hz. Epochs containing artifacts (SQUID jumps, eye blinks, head movement, or muscles) were removed by thresholding based on a variance exceeding 3×10−24 T, kurtosis larger than 15, and z-score larger than 4. Cardiac artifacts were removed using independent component analysis (ICA) based on the infomax algorithm (Bell and Sejnowski, 1995 (link)). On average (± SD), 8 ± 4.5 epochs (i.e., seconds) per run were removed across participants.
Youssofzadeh V., Conant L., Stout J., Ustine C., Humphries C., Gross W.L., Shah-Basak P., Mathis J., Awe E., Allen L., DeYoe E.A., Carlson C., Anderson C.T., Maganti R., Hermann B., Nair V.A., Prabhakaran V., Meyerand B., Binder J.R, & Raghavan M. (2022). Late dominance of the right hemisphere during narrative comprehension. NeuroImage, 264, 119749.
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