Hi David,
you're right, trying to define your ROI in the CC of
T1-w images is tricky as even good non-linear
registrations hardly manage to compensate for the
distortion that is present (mainly) in the genu of the
CC. I would suggest that you use your FA image - which
is of good GM/WM contrast - to define your ROI instead
of your Bo image, even if both are low resoluted...
Cheers,
Gwenaelle
--- David Roalf <[log in to unmask]> a écrit :
> I am somewhat new to FSL and I am using FSL to
> analyze DTI data. I am
> having difficulty accurately extracting FA values.
> My method has been to
> draw my ROI (i.e. Corpus Callosum) on the B0 image.
> The only issue I have
> with this is that b/c of the low resolution it is
> difficult to be accurate.
> I feel like the more precise method would be to
> draw my ROI on the
> anatomical image and then be able to apply that mask
> to the FA output file.
> Yet, I know if I draw an ROI on my anatomical image
> they will not be in the
> same space and thus applying this mask would not
> work.
>
> Is there a way to accurately draw a map on the
> high-res anatomical image and
> be able to transform this mask to the same space at
> the DTI output?
>
> Thanks.
>
> David Roalf
> Graduate Student
> Oregon Health & Science University
>
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