I am not very familiar with QDEC, but found this on the freesurfer list that might help you get your clusters back into individual subject structural space

If your tractography has been performed in DTI space, as it looks like it has, you will also need to calculate the transformation between DTI and the freesurfer structural volume before you can overlap the results.

Once the clusters are in volume space you would also be able to use them as seed regions for tractography should you wish to. Tractography can be run directly from the T1 space provided you supply FDT with the T1-diffusion transformation.

On 20 August 2012 21:10, antonella torok <[log in to unmask]> wrote:

Dear FSL's experts,

I am trying to find what is the conncetion between white matter tracts with reduced FA and a number of cortical regions/clusters with significant reduction in cortical thickness from QDEC.

1) Is there a way to overlap the connectivity maps and cortical regions more exactly the clusters from QDEC.

2) Do I need to run tractography using this clusters so do I also need to get a connectivity map of this clusters and then overlap this map over my DTI connectivity map?

Any suggestion will be greatly appreciated.

Thank you.
Antonella