Hi Nelles,<br><br>I believe they are the same (Hangyi, correct me if I'm wrong). Usually after tensor calculation, we save tensor-derived images such as FA, eigenvalues, and eigenvectors. However, sometimes we save only a tensor file to save the disc space, because as long as we save the raw tensor file, we can re-generate all the derived images. To perform tracking, you need to load the tensor file, calculate FA and eigenvectors, save them, and load them again for tracking. The "using the tensor images" option save time by eliminating these steps when you have only the tensor file. You just load the tensor file and start tracking.<br>
<br>Susumu<br><br><div class="gmail_quote">On Wed, Apr 21, 2010 at 5:32 AM, <span dir="ltr"><<a href="mailto:Michael.Nelles@ukb.uni-bonn.de">Michael.Nelles@ukb.uni-bonn.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br><font size="2" face="sans-serif">Hi all,</font>
<br>
<br><font size="2" face="sans-serif">I have questions concerning the two
Fiber Tracking methods one can choose when starting Fiber-Tracking:</font>
<br><font size="2" face="sans-serif">what is the difference between tracking
"using principal vector and FA map" and tracking "using
tensor images" ?</font>
<br><font size="2" face="sans-serif">Are there any relevant differences of
tracking results (of e.g. the CST) to be expected ?</font>
<br>
<br><font size="2" face="sans-serif">Is it true that you have to flip the
z-component of the Eigen-Vector when processing Philips DTI data ?</font>
<br>
<br><font size="2" face="sans-serif">Thanks in advance !</font>
<br>
<br><font size="2" face="sans-serif">M. Nelles</font><br>_______________________________________________<br>
Mristudio-users mailing list<br>
<a href="mailto:Mristudio-users@mristudio.org">Mristudio-users@mristudio.org</a><br>
<a href="http://lists.mristudio.org/mailman/listinfo/" target="_blank">http://lists.mristudio.org/mailman/listinfo/</a><br>
Unsubscribe, send a blank email to: <a href="mailto:Mristudio-users-unsubscribe@mristudio.org">Mristudio-users-unsubscribe@mristudio.org</a><br>
<br></blockquote></div><br>