<div dir="ltr">Hi,<div style>So I combined the ROIs as mentioned above (did this in MATLAB as I found it easier); these were for the left frontal and left temporal lobes (used to extract the SLF-t). Only a few fibers were extracted, and I am unsure as to why there are so few. I'm using the processed data (Subject_LDDMM.d) for tractography. </div>
<div style>Also I noticed in the paper (also mentioned above), there are ROIs listed for major tracts, such as CST, SLF, etc. How can this one ROI be used to extract a tract? I noticed the results using the one ROI for the CST, and the actual list of ROIs are very different. </div>
<div style>Thanks, </div><div style><br></div><div style>Deepa </div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Apr 15, 2013 at 7:40 PM, susumu mori <span dir="ltr"><<a href="mailto:susumu@mri.jhu.edu" target="_blank">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"><div dir="ltr">Good question.<div>There may be a clever way to do it, but I would combine the ROI #1-3 and ROI#4-6 first and create two ROI masking files.</div>
</div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">
On Mon, Apr 15, 2013 at 4:46 PM, Deepa Krishnaswamy <span dir="ltr"><<a href="mailto:deepa.krishnaswamy1@gmail.com" target="_blank">deepa.krishnaswamy1@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi, <div>Thanks Durai, you are absolutely correct. It seems that using two ROIs (first as AND, second as OR) is exactly the same as using the second ROI as an OR. </div><div>Another question, if I am trying to implement something like (ROI1 OR ROI2 OR ROI3) AND (ROI4 OR ROI5 OR ROI6), how would this actually be done using the map file? Of course I could do this by manually combining ROI1, 2 and 3 together, as well as 4,5 and 6, but I don't want to do that. </div>
<div>Thanks, </div><div><br></div><div>Deepa </div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div>On Mon, Apr 15, 2013 at 2:55 PM, Durai Arasan <span dir="ltr"><<a href="mailto:durai23@gmail.com" target="_blank">durai23@gmail.com</a>></span> wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="gmail_quote"><div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div><br></div><div>If say I happen to put the first operation as AND, and the second operation as OR, I still obtain a fiber bundle. I don't understand what this actually means logically. </div>
</div></blockquote><div><br></div></div><div>If the fiber bundle obtained is the same as that obtained if you just draw one OR roi, then it means the result of the first AND operation was a null roi. I think the logical ROI operations in DTI studio take a "null roi" as the default argument when a roi is not provided explicitly.</div>
</div>
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