Hi,
these should be the corresponding XYZ coordinates at each voxel of your
mask.
Cheers,
Andreas
Von: John Sheppard <[log in to unmask]>
Antworten an: FSL - FMRIB's Software Library <[log in to unmask]>
Datum: Montag, 11. Mai 2015 23:21
An: <[log in to unmask]>
Betreff: [FSL] Different number of TRs appearing in fslmeants depending
on -showall option
Hello,
I have a question about using fslmeants.
I have been using fslmeants either to export the averaged time course
across all voxels in a mask for my functional data, or alternatively to
export the time course for *every* voxel in the mask separately by
applying the --showall option.
Example syntax
Method 1:
fslmeants -i funcdata.nii.gz -m mask.nii.gz -o roi_mean_TS.txt
Method 2:
fslmeants -i funcdata.nii.gz -m mask.nii.gz --showall -o
roi_voxelwise_TS.txt
I expect to get the same number of rows of text output for either the
averaged or voxel-wise outputs described above, which should equal the
number of time points (TRs) in the functional data.
I indeed get the appropriate number of rows --198 -- of text output from
the averaged time-series (method 1), but I get three extra rows -- 201 --
of text output for the voxelwise time series when I use method 2.
Can anyone explain this discrepancy? Why are there extra rows of time
points inserted into the output when I use the --showall option with
fslmeants?
For reference, I attached a couple output files here. One is the roi mean
(averaged) ts from a mask I had, which should load a 198x1 vector. The
other is the voxel-wise ts matrix I get from when I use the --showall
option, and it gives a 201 x 68 matrix instead of a 198 x 68 matrix as I
expect for 198 TRs and 68 voxels. I think the first three rows of this
matrix are erroneous but I'm not 100% sure, and I'm not sure why they are
present in the first place.
Thank you!
John Sheppard
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