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<p>Hi Susumu,<br>
thanks very much for the quick reply. <br>
<br>
With kind regards,<br>
M. Nelles<br>
<br>
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Michael Nelles, MD <br>
Dept. of Radiology / Neuroradiology <br>
University of Bonn Medical Center <br>
Sigmund Freud Str. 25, <br>
D - 53105 Bonn, Germany <br>
Phone: (+49) 228 287 16389 <br>
Fax: (+49) 228 287 14321 <br>
Email: michael.nelles@ukb.uni-bonn.de<br>
<br>
<img src="cid:10__=4EBBFD9FDFDE5D0A8f9e8a93@ukb.uni-bonn.de" width="16" height="16" alt="Inactive hide details for susumu mori <susumu@mri.jhu.edu>">susumu mori <susumu@mri.jhu.edu><br>
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<ul><b><font size="2">susumu mori <susumu@mri.jhu.edu></font></b><font size="2"> </font><br>
<font size="2">Gesendet von: mristudio-users-bounces@mristudio.org</font>
<p><font size="2">21.04.2010 14:26</font>
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<tr valign="top"><td width="168" bgcolor="#FFFFFF"><div align="center"><font size="2">Bitte antworten an<br>
"DTI Studio, ROI Editor, DiffeoMap Questions/Support" <mristudio-users@mristudio.org></font></div></td></tr>
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<font size="2">"DTI Studio, ROI Editor, DiffeoMap Questions/Support" <mristudio-users@mristudio.org>, Hangyi Jiang <hjiang@jhmi.edu></font></td></tr>
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<font size="2">Re: [Mristudio-users] Fiber-Tracking Menu Options</font></td></tr>
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<font size="4">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>
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<font size="4">On Wed, Apr 21, 2010 at 5:32 AM, <</font><a href="mailto:Michael.Nelles@ukb.uni-bonn.de"><u><font size="4" color="#0000FF">Michael.Nelles@ukb.uni-bonn.de</font></u></a><font size="4">> wrote:</font>
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Hi all,<font size="4"> <br>
</font><br>
I have questions concerning the two Fiber Tracking methods one can choose when starting Fiber-Tracking:<font size="4"> </font><br>
what is the difference between tracking "using principal vector and FA map" and tracking "using tensor images" ?<font size="4"> </font><br>
Are there any relevant differences of tracking results (of e.g. the CST) to be expected ?<font size="4"> <br>
</font><br>
Is it true that you have to flip the z-component of the Eigen-Vector when processing Philips DTI data ?<font size="4"> <br>
</font><br>
Thanks in advance !<font size="4"> <br>
</font><br>
M. Nelles<font size="4"><br>
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