Hi Antonella,
1). I wonder if the GLM group analysis that is described on the webpage you sent me (as instructed by Doug and Bruce, I was aware of this webpage and I used it for my QDEC studies but I am not sure if can be used for DTI data analysis) can be used for a DTI group analysis.
The concepts are the same, so you shoudl be able to use the same guideline for your diffusion analysis.
Can I use the tksurfer to analyse my data and see the significant clusters OR I will need to use the freeview as described on the DTI basic website?
You would only use tksurfer if your data is represented on surface maps. I assume that you are doing your diffusion analysis in the volume so you can follow the wiki instructions about using FreeView.
2). Also registration of lowb to same-subject anatomical using FSLs flirt creates mask.nii and register.dat files. Can you please expalin what is the mask.nii?
These files are created by the dt_recon stream if I am correct. We do not use the mask.nii file, but it is one attempt to create a brainmask file from the diffusion data. The register.dat file represents the transform between diffusion and structural space.
3). Is fa-tal.nii the resampled image in TAL_to_avg35 template?
It is the resampled image in Talairach space.
- How can I gaet the TAL_to_avg35 template?
I am not sure what template you are referring to.
--Lilla