Hi - you need to use vecreg, not applywarp for this.
On Thu, Apr 7, 2016 at 4:48 PM, Kamps, J.J.W.
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> Dear all,
>
>
>
> I’ve calculated a transformation matrix (FLIRT, 12 dof’s) to register FA
> data on an FA atlas. Next, I would like to apply this transformation on the
> original DTI tensor data (the tensor data from which the FA was calculated).
> I tried to do this by using applywarp where I gave as argument
> –premat=transform.mat. However, I’m wondering whether FSL is able to apply
> transformations on tensor data, which is 4-dimensional data: 3D spatial and
> one additional dimension for the six independent tensor elements. This I
> wonder especially because the result it gives me looks like it somehow
> changes the orientation of the main eigenvector. Could this be because the
> interpolation of tensor data in in applywarp changes the orientation (I
> tried both trilinear interpolation and nearest neighbor) or is this just
> because I shouldn’t use tensor data for the applywarp command?
>
> Thanks in advance.
>
>
>
> Joep
--
Niels Bergsland
Integration Director
Buffalo Neuroimaging Analysis Center
100 High St. Buffalo NY 14203
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