The surface is the more accurate representation of the surface and the images show the best voxel-wise equivalent of this. For analysing differences between groups (or correlations) the vertex analysis uses the information in the vtk files, not the images.
I hope this helps.
All the best,
Mark
On 25 Aug 2011, at 23:27, Xiaoying Tang wrote:
> Hi all,
>
> I am running FIRST to get subcortical segmentations of T1 image. After it is done, I get image of each subcortical structure. Besides, I get vtk surfaces of each subcortical structure. I am wondering whether that vtk surface exactly corresponds to the volume of the structure.
>
> Thanks a lot.
>
> Best,
> Xiaoying
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