Hi Joana - You can try our in-house tool for within-subject registration, 
bbregister, with the --dti option.

a.y

On Thu, 13 Oct 2011, Joana Braga Pereira wrote:

> Dear FreeSurfers,
> I'm trying to coregister FA images pre-processed with FSL to Freesurfer, 
> however i'm having a few problems and
> was wondering if someone could help me out.
> 
> These are the steps that i carried out:
> 
> mri_convert subj_01/mri/brain.mgz brain.nii.gz
> 
> fslswapdim brain.nii.gz x z -y brain_swap.nii.gz
> 
> flirt -ref brain_swap.nii.gz -in nodif_brain.nii.gz -out XXX.nii.gz -omat 
> XXX.mat -cost corratio -dof 6
> -interp trilinear
> 
> flirt -in myFA.nii.gz -ref XXX.nii.gz -out myFA_coregistered.nii.gz -applyxfm 
> -init XXX.mat
> 
> 
> Unfortunately myFA_coregistered.nii.gz was not as good as i expected since I 
> want to extract the mean FA
> values of a subcortical ROI from freesurfer and to do that you need quite 
> good coregistration.
> 
> Does anyone know a better way to do this?
> 
> Many thanks,
> 
> Joana
> 
>
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