You could use imcalc to mask out any voxels with, for example, an FA
value <= 0.15. That may get rid of many extra-brain voxels.
Won-Jin Moon wrote:
> Hello
>
> I am doing research on the DTI of normal white matter development in
> children/adolescent group (5-17 years).
> I used customized template using our own B0 image as described in previous
> papers.
> I have run SPM to know correlation between FA map and Age and got quite a
> good result.
> The problem is that there is a substantial part of significantly correlated area
> seen outside brain and adjacent to the basal part of brain (inferior temporal
> near the temporal base).
> At first, I thought explicit mask would be helpful for excluding these outside
> brain areas. But, I have not standard T2 images or T1 images for my study.
> I only have EPI B0, ADC, and FA map.
> In this case, How could I make an explicit mask in order to exclude non-brain
> voxels? Or is there any other solution for that?
>
> I am looking forward your advice.
>
> With best regards,
>
> Won-Jin Moon
>
|