Hi Miguel,<br><br>It seems your Y-flip is right, although it's very rare that you have to flip Y. Usually X (Siemens) or Z (Philips).<br>Please also do try genu, body, and splenium of the corpus callosum at the mid-sagittal level. I think it'll work but just to make sure.<br>
<br>Also, if you are using Siemens (before VB15) or Philips (if you are using Gradient Overplus), make sure that you are taking care the oblique angles right.<br><br>Susumu<br><br><div class="gmail_quote">On Fri, Dec 11, 2009 at 1:48 PM, Miguel Burgaleta <span dir="ltr"><<a href="mailto:miguel.burgaleta@uam.es">miguel.burgaleta@uam.es</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;"><br>
Dear DTIStudio experts,<br>
<br>
My question has to do with the flipping of the eigenvectors in fiber tracking. It looks like this is something very tricky, so I would like to make sure that I am choosing the right one.<br>
<br>
So I ran the fiber tracking ( starting and ending FA thresholds at .2 and angle at 40) and tried a single 'OR' ROI in the brainstem, capturing the corticospinal tract. I used this single ROI to track fibers in 4 conditions: no flipping of eigenvectors, flipping of X, flipping of Y and flipping of Z.<br>
<br>
Please see results in attachment (note that the acquisition is not a full brain coverage). I'm not very good at anatomy but would say that flipping the Y eigenvector leads to the best results - better than no flipping... What do you think?<br>
<br>
Thanks in advance for your time.<br><font color="#888888">
<br>
Miguel</font><br><br>
<br>
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