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

[johnjtchen at aol.co.uk]

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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