On 4/2/19 4:23 PM, Zhi Li wrote:
>
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>
> Dear Freesurfer experts,
>
> I would like to transform the task-based surface data to volume. May I
> know if it is applicable? I tried "mri_surf2vol --o test.nii.gz
> --subject sub002 --so fs/sub002/surf/lh.white
> fMRI/sub002/task/001/fmcpr.odd.sm5.fsaverage.lh.nii.gz", but my system
> frozen. Any suggestions would be appreciated.
You are trying to convert the raw time series data into the anatomical
space. The anat space is 256*256*256. If you have many time points, the
functional volume in the anatomical space is going to be huge. This
would explain why your computer is frozen. Also, the surface fmri data
is on subject fsaverage, not on sub002.
>
> Another problem is that in some individuals I found the RAS
> information of preprocessed surface data of different sessions are not
> identical, that means the "voxel to ras transform" and "ras to voxel
> transform" in fmcpr.odd.sm5.fsaverage.lh.nii.gz are different between
> seesion1 (folder 001) and session2 (folder 002). May I know how this
> happened and will it influence the final result? Should I keep them
> the same?
The vox2ras for surface overlay data is not valid, so ignore it.
>
> Thanks,
>
> LIzhi
>
>
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