Hi Elisa
if you only use --s fsaverage, then mri_surf2surf assumes you are mapping
within subject. If you want to map from one subject to another you need
to use --srcsubject sub01 --trgsubject fsaverage
And yes, if you get that working I think fscalc should do the trick (or it
would be easy to do in matlab).
cheers
Bruce
On Fri, 13 Jul 2018, Elisa
Castaldi wrote:
External Email - Use Caution
Dear experts,
I would like to show the across-subject overlap of voxels by creating a map
with color coding
indicating the number of subjects activating corresponding voxels.
For each subject I have run the first level model in spss and saved the 1000
most activated voxels
for a given contrast as an roi (binary file).
Now with freesurfer I am trying to :
1) display the saved roi on the subject's surface (which has been obtained with
recon all) - this
step worked
2) align each subject's surface to fsaverage - this step gave me the problem
3) add all subjects together and create the map showing how many subjects
activated each location
To do so I have done the following:
1) this first step worked fine and I could display the roi on my subject's
surface
mri_vol2surf --mov ${DATA_DIR}/sub01/vois/1000vox_IPS.nii \
--reg ${DATA_DIR}/sub01/fmri/register.dat \
--hemi rh \
--o ${DATA_DIR}/sub01/probmap/testIPS.rh.mgh \
--projfrac ${thisprojfrac}
2) this step crashed
mri_surf2surf --hemi rh --s fsaverage --fwhm 3 --cortex \
--sval ${DATA_DIR}/sub01/probmap/testIPS.rh.mgh --tval
${DATA_DIR}/sub01/probmap/testIPSfs.mgh
The error is:
Loading source data
ERROR: dimension inconsistency in source data
Number of surface vertices = 163842
Number of value vertices = 133030
Do you have any idea why?
3)Then I was planning to use fscalc and add all subjects together, is this
correct?
If there is another/easier way to do the same thing, please let me know
Thanks in advance for your help,
Best
Elisa
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