Download MaxFilter 2.0 Manual

1
Introduction
1.3 Software functionality
MaxFilter 2.0 software provides three separate programs:
MaxFilter
The main application for doing Maxwell filtering called from
a command line. This program includes also MaxST and MaxMove functions.
MaxAve
Off-line version of the on-line averager, provided for convenient re-averaging of raw data before or after Maxwell filtering.
MaxFilter_GUI
Graphical user interface program which collects the input
arguments, and then starts MaxFilter or MaxAve as a subprocess. Information of the data processing is displayed on the
main display and in a log window.
The main functions of MaxFilter are:
Software shielding
By subtracting the component b out from measured signals b ,
the program performs software shielding on the measured
MEG data.
Automated detection of bad channels
By comparing the reconstructed sum b in + b out with measured signals b , the program can automatically detect if there
are MEG channels with bad data that need to be excluded
from Maxwell filtering.
Spatio-temporal suppression of S T -space artifacts
By subtracting the reconstructed waveforms b in ( t ) + b out ( t )
from measured signals b ( t ) , the program can identify and
suppress artifact waveforms which arise in the S T -space.
Transformation of MEG data between different head positions
By transforming the component b in into harmonic amplitudes
(i.e. virtual channels), MEG signals in a different head position can be estimated easily.
Compensation of disturbances caused by head movements
By extracting head position indicator (HPI) signals applied
continuosly during a measurement, the data transformation
capability is utilized to estimate the corresponding MEG signals in a static reference head position.
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2006-10-31
NM21993A