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.
<br><br>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 >
<br><br>--<br>karthik<br><br><div><span class="gmail_quote">On 3/15/07, <b class="gmail_sendername"><a href="mailto:johnjtchen@aol.co.uk">johnjtchen@aol.co.uk</a></b> <<a href="mailto:johnjtchen@aol.co.uk">johnjtchen@aol.co.uk
</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>
<div>Hi <span style=""></span>Karthik,</div>
<div> </div>
<div>Thanks a lot.</div>
<div> </div>
<div>The 6 gradient images I meant were actually the Dxx, Dyy, Dzz, Dxy, Dxz, Dyz from D matrix.</div>
<div>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. </div>
<div> </div>
<div><font size="2">
<div></div></font><font color="#008000" size="2">// Note that the indices are related to the fact </font></div>
<font size="2">
<div></div></font><font color="#008000" size="2">// that we store only the upper-right triangle of</font></div>
<font size="2">
<div></div></font><font color="#008000" size="2">// the matrix. Like
</font><font size="2">
<div></div></font><font color="#008000" size="2">//
</font><font size="2">
<div></div></font><font color="#008000" size="2">// | 0 1 2 |
</font><font size="2">
<div></div></font><font color="#008000" size="2">// | X 3 4 |
</font><font size="2">
<div></div></font><font color="#008000" size="2">// | X X 5 |
</font><font size="2">
<div></div></font><font color="#008000" size="2">//
</font><font size="2">
<div></div></font><font color="#008000" size="2">// The trace is therefore the sum of the components
</font><font size="2">
<div></div></font><font color="#008000" size="2">// M[0], M[3] and M[5].</font>
<div><font color="#008000" size="2"></font> </div>
<div><font color="#008000">Cheers</font></div>
<div><font color="#008000" size="2"></font> </div>
<div><font color="#008000" size="2">Best</font></div><div><span class="e" id="q_1115598d6664eaaf_1">
<div><font color="#008000" size="2">John</font></div>
<div>
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