Hi Mojdeh,<br><br>Please load the eigenvector file into DtiStudio as a "vector" file and read the pixel-by-pixel values at the bottom of the window by placing the cursor.<br>If you find that the vector file does contain both positive and negative elements, then, the problem seems to be the file reading by MatLab.<br>
<br>Susumu<br><br><div class="gmail_quote">On Thu, Dec 17, 2009 at 1:09 PM, Mojdeh <span dir="ltr"><<a href="mailto:zamyadim@sri.utoronto.ca">zamyadim@sri.utoronto.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi there,<br>
<br>
I have 49 slice DTI image of brain with 2 B0 + 23 gradient directions.<br>
I loaded the image and calculated the tensor, eigenvectors, ... for the<br>
image and then save the results in analyze format. However, when I load<br>
the eigenvectors into MATLAB and look at the x-y-z coordinates of<br>
eigenvectors they are all positive numbers which doesn't make any sense<br>
to me! Does anyone know what might be the problem?<br>
<br>
Thanks a lot in advance,<br>
<font color="#888888">Mojdeh<br>
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