Hello
I am trying to do Temporal bandpass filtering using the ip command on the
output of BET(.img).I am not sure what I am doing is right.I know that the
values for highpass and lowpass are to be specified in volumes and not in
seconds.The exact command line I am running is something like this
ip I/Pfile O/Pfile -t hp_value lp_value
where "value" is the numbers I plug in.
When I run this command it just prints out this....
Usage: /usr/pubsw/packages/fsl/current/bin/ip_16SI <DEFANGED_input> <output>
<%threshold> [options]
-s <sigma> : spatial lowpass Gaussian linear filtering (sigma in mm, not voxels)
-S <width> : spatial lowpass median filtering (width is full cube width in
voxels)
-m <mask_filename> : create binary mask, apply to fmri data and save mask to
file
-i <target mean> : global intensity normalisation (separate intensity
rescaling for each 3D volume)
-I <target mean> : grand mean intensity normalisation (one intensity scaling
for the whole 4D data set)
-t <hp_sigma> <lp_sigma> : Bandpass temporal filtering; nonlinear highpass
and Gaussian linear lowpass (with sigmas in volumes, not seconds); set
either sigma<0 to skip that filter
-T <hp_sigma> <lp_sigma> : Same as -t, but only uses previous timepoints wrt
each timepoint for filtering
I am not sure what is going wrong.Does anyone know what to do?
Thanks
Shru
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