Hi,
Internally the vertices are used to do the shape analysis, but these are then projected back into a volume in order to run the non-parametric statistics. The result is a volumetric image for the statistics, and this is what should be interpreted. So you can effectively ignore the fact that vertices were used internally and just interpret the volumetric output.
All the best,
Mark
On 18 Jun 2014, at 07:03, Dorian Bellwald <[log in to unmask]> wrote:
> Dear FSL experts
>
> I conducted a vertex-wise shape analysis with FIRST, following the user guide. I ran first_utils and then randomise by choosing the TFCE option. After randomise I ran the cluster command to extract cluster information. Because the shape analysis is vertex-based, I wonder how the randomise and cluster commands (which are voxel-based) have to be interpreted. For example: When running the cluster command revealing a cluster of 139 voxels, does the number of voxels correspond to the number of vertices?
>
> Thank you for your help.
> Best regards
> Dorian Bellwald
|