Brain Imaging & Analysis Center

usage: -expr bandpass flag minfreq maxfreq scalefact

The BANDPASS function will filter out frequencies below MINFREQ and above MAXFREQ. If MINFREQ is greater than MAXFREQ, then BANDPASS acts as a notch filter to remove frequencies between MAXFREQ and MINFREQ.

SCALEFACT is a scaling factor; output intensity values will be divided by SCALEFACT. Default SCALEFACT is 1000.

The FLAG argument can be used to select filtering options.

FLAG:

• 1 - frequencies are in time axis units (i.e. TR's) (default: frequencies are Hertz)
• 2 - 2-d spatial filtering (default is temporal filtering) [not implemented yet]
• 4 - make output wordsize same as input (default: output is FLOAT32)

See Also:
fScan Home, fScan Manual, CmdLineOptions, Expression Command, Manual Help