Thanks for the reply. I am using FSL v5.0.8, but have also tried with 5.0.6.

Does that mean that there is no way to do seed-to-wholebrain connectivity
based on surfaces right now? Or is it possible to do a similar thing using
one of the other --omatrix options?

-M


On Thu, Jul 9, 2015 at 5:49 PM, Glasser, Matthew <[email protected]>
wrote:

>  That error suggests that that particular flag is not ready for surfaces
> yet and is looking for a NIFTI volume.  Do you have the latest version of
> FSL?  Perhaps Stam can comment on whether --target2 will be able to handle
> surfaces in the future.
>
>  Peace,
>
>  Matt.
>
>   From: <[email protected]> on behalf of Maarten
> Vaessen <[email protected]>
> Date: Thursday, July 9, 2015 at 9:43 AM
> To: "[email protected]" <[email protected]>
> Subject: [HCP-Users] probtrackx2 surface tracking in matrix2 mode
>
>   Hello experts,
>
>  I am trying track from a seed surface roi to all WM surface vertices
> using matrix2 mode in probtackx2 using data from the HCP. I have followed
> the guide on how to convert surfaces using the surf2surf command where
> necessary. However I get this error when running probtrackx2
>
>  Done loading samples.
> Image Exception : #22 :: ERROR: Could not open image
> ../fsaverage_LR32k/102816.L.white.32k_fs_LR.surf.gii
> terminate called after throwing an instance of 'RBD_COMMON::BaseException'
> Aborted
>
>  I am not sure what is wrong, the file is definitely there. Moreover when
> I take this file as the seed (-x
> ../fsaverage_LR32k/102816.L.white.32k_fs_LR.surf.gii), there is no error
> when loading the seeds:
>
>  Running in seedmask mode
> load seeds
> read gifti
> done.
>
>  Here is the full command:
>
>  probtrackx2 -x L.STS.fsl.gii --onewaycondition --omatrix2
> --target2=../fsaverage_LR32k/102816.L.white.32k_fs_LR.surf.gii -P 50
> --forcedir --dir=./test_surf_track_STS_Lwhite -s
> ../Diffusion.bedpostX/merged -m nodif_brain_mask.nii.gz
>  --seedref=nodif_brain_mask.nii.gz
>
>
>  Thanks for the help!
>
>  -Maarten
>
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