[Insight-users] Re: Is there a way to use itk::DiffusionTensor3DReconstructionImageFilter without calling SetReferenceImage() first?

[Karthik Krishnan]

Its not DiffusionTensorReconstructionImageFilter that you seek then, since
you seem to have already reconstructed the tensor (D).  These aren't
referred to as the gradient images. They are the 6 components of the tensor.
This tensor is reconstructed from the gradient images.

itk::DiffusionTensor3D is simply a pixel type for symmetric second rank
diffusion tensors. It provides the API for a 3x3 matrix, so you can do your
standard matrix operations, but internally stores the matrix with a linear
array of 6 components, to save memory. You are probably just looking to
manage an image of tensors : Image< DiffusionTensor3D , 3 >

--
karthik

On 3/15/07, johnjtchen at aol.co.uk <johnjtchen at aol.co.uk> wrote:
>
> Hi Karthik,
>
> Thanks a lot.
>
> The 6 gradient images I meant were actually the Dxx, Dyy, Dzz, Dxy, Dxz,
> Dyz from D matrix.
> I just don't know how itk::DiffusionTensor3D manage to store them and I
> cannot find the documentation that discribe it explicitly. Now I found it in
> DiffusionTensor3D .h.
>
>  // Note that the indices are related to the fact
>  // that we store only the upper-right triangle of
>  // the matrix. Like
> //
> // | 0 1 2 |
> // | X 3 4 |
> // | X X 5 |
> //
> // The trace is therefore the sum of the components
> // M[0], M[3] and M[5].
> Cheers
>
> Best
> John
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