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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dear DtiStudio,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>A further question on this topic:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Is the statistics (by clicking the statistics button in
DtiStudio) given along the select fibers density-weighted or not?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Aifeng<o:p></o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mristudio-users-bounces@mristudio.org
[mailto:mristudio-users-bounces@mristudio.org] <b>On Behalf Of </b>susumu mori<br>
<b>Sent:</b> Saturday, July 24, 2010 7:57 AM<br>
<b>To:</b> DTI Studio, ROI Editor, DiffeoMap Questions/Support; Hangyi Jiang<br>
<b>Subject:</b> Re: [Mristudio-users] new option save fiber density<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hi Venkat,<br>
<br>
After fiber tracking, it is a common practice to quantify the results. For the
quantification, the streamline information of the tractography needs to be
converted to pixel information. For this conversion, the simplest way is to use
1/0 binarilzation. If a pixel contains a streamline, it becomes 1 and if not,
remains 0. This is basically a masking, which can be applied to, for example, a
FA map and get a FA value of the tract. You can also count the number of pixels
with "1" and use it as the tract volume.<br>
<br>
One problem of this simple approach is that even if a pixel contains 10
streamlines, the pixel becomes "1", which is the same as another
pixel that contains only 1 streamline. Namely, during the binalization,
information about the density of the streamline is lost. I believe (Hangyi,
please correct me if I'm wrong) "fiber density map" tells how many
streamlines were there in each pixel. You can potentially use it to get, for
example, density-weighted FA value, in which pixels that contain more
streamlines are more weighted than those contain only 1 streamline.<o:p></o:p></p>
<div>
<p class=MsoNormal>On Fri, Jul 23, 2010 at 6:19 PM, Rajagopalan, Venkateswaran
<<a href="mailto:rajagov2@ccf.org" target="_blank">rajagov2@ccf.org</a>>
wrote:<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<p><span style='font-size:10.0pt'>Dear All,<br>
<br>
I am using DTIstudio_latest_x86.exe after fiber tractography I notices a new
option named "save fiber density map" (normalized and non
normalized). I am wondering what information does this fiber density map convey
and how this information can be used for instance to compare between two groups.
How the map is normalized.<br>
<br>
Thanks<br>
<br>
Venkat</span> <o:p></o:p></p>
<pre>===================================<o:p></o:p></pre>
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style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:navy'> </span><span
style='font-size:7.0pt;font-family:"Arial","sans-serif";color:green'>Please
consider the environment before printing this e-mail</span><o:p></o:p></p>
<pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>Cleveland Clinic is ranked one of the top hospitals<o:p></o:p></pre><pre>in America by U.S.News & World Report (2009). <o:p></o:p></pre><pre>Visit us online at <a
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