<div>Susumu,</div><div><br></div>Thanks for your answer to my question.<div>To me the appended image in the last place looks like an averaged image, but it look different from the mean of all DWIs generated by DTI Studio. So the origin or feature of the appended image is still not clear. </div>
<div><br></div><div>Based on this, using the mean of all DWIs generated by DTI Studio would be better for intra-individual registration (built-in AIR) template, I guess. </div><div><br></div><div>Do you have any opinion to this intra-individual registration approach?</div>
<div><br></div><div>-SC </div><div><br><br><div class="gmail_quote">On Fri, Oct 2, 2009 at 3:55 PM, susumu mori <span dir="ltr"><<a href="mailto:susumu@mri.jhu.edu">susumu@mri.jhu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Here are important facts about Philips data;<br><br>1) You can control the number of b0 images (say 5 b0). However, no matter how many b0 you take, you get only 1 b0 image in the file (they are already averaged).<br>2) The final appended image is a calculated "isotropically diffusion-weighted image" (I believe). I'm not sure exactly how it is created. Maybe simply a sum of all DWIs. You don't use this image for tensor calculation. As you mentioned, in DtiStudio, you remove it by using [100, 100, 100].<br>
3) The order of b0, DWI, and the appended iso-DWI can be specified in the console. In the past, the default order was b0 - DWIs - iso, but in newer versions of operating system, you may get a file with DWIs-b0-iso order.<br>
<br>Hope it helps.<br><br>Susumu<br><br><div class="gmail_quote"><div><div></div><div class="h5">On Wed, Sep 30, 2009 at 11:50 AM, [Seongjin] <span dir="ltr"><<a href="mailto:choisj70@gmail.com" target="_blank">choisj70@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex"><div><div></div><div class="h5">
Dear Philips users among DTI studio users,<div><br></div><div>DTI data (from a scanner) consists of b=0 image, other DWIs corresponding to the number of gradients and one more extra image.</div><div>Anyone knows the details of the extra image from the scanner? In DTI studio, it's gradient table is 100, 100, 100. Typically it comes last in the data set.</div>
<div>It looks like a averaged image of all other DWIs. However, it looks different from the mean of all DWIs generated from DTI Studio.</div><div><br></div><div>Thanks in advance.</div><div><br></div><div>-SC</div><div><br>
</div>
<br></div></div>_______________________________________________<br>
Mristudio-users mailing list<br>
<a href="mailto:Mristudio-users@mristudio.org" target="_blank">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" target="_blank">Mristudio-users-unsubscribe@mristudio.org</a><br>
<br></blockquote></div><br>
<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></div>