<div>Hi, Tejasvi,</div><div><br></div><div>As for the probabilistic tract maps, you can download from the following website, and follow the instructions on the page to use these data. <a href="http://lbam.med.jhmi.edu/cmrm/Data_Yajing/fiberMenu.htm">http://lbam.med.jhmi.edu/cmrm/Data_Yajing/fiberMenu.htm</a> . </div>
<div><br></div><div>Best regards,</div><div>Yajing</div><div><br></div><div><br></div><br><div class="gmail_quote">On Fri, Mar 25, 2011 at 9:32 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;">Hi Tejasvi,<br>
<br>
I must admit that I'm not familiar with the exact data format you can<br>
download from the FSL website. I thought the tractography atlases are<br>
scaled 0-1....<br>
<br>
>From <a href="http://www.mristudio.org" target="_blank">www.mristudio.org</a>, you can download RoiEditor, which comes with 4<br>
different types of atlases. Three of them, ICBM-DTI-81, JHU-GA, and<br>
JHU-SS, also have probabilistic tract maps. For the JHU-SS atlas,<br>
there is also a comprehensive set of tract probabilistic maps for more<br>
than 40 tracts, which you can download from our website. Please<br>
contact Yajing for the location<br>
<br>
On Thu, Mar 24, 2011 at 10:21 PM, Tejasvi Ramanand<br>
<<a href="mailto:tejasviramanand@gmail.com">tejasviramanand@gmail.com</a>> wrote:<br>
> Hi,<br>
><br>
> I am new to the field of DTI. I am trying to use probability atlas for some<br>
> data analysis.<br>
> I downloaded the JHU atlas from the FSL website.<br>
> There are 2 JHU White matter atlases.<br>
> 1)JHU ICBM-DTI-81 White-Matter Labels<br>
> 2) JHU White-Matter Tractography Atlas<br>
><br>
> From what I understand JHU White-Matter Tractography Atlas, is a<br>
> probability atlas.<br>
> So, for every voxel in each tract (20 tracts) specified there should be a<br>
> 0 to 1 probability value.<br>
> This probability will determine the probability of that voxel belonging to<br>
> that particular tract.<br>
> But, where could I find the probability values?<br>
> When I use DTIStudio to open the atlas, all I could see as the intensity<br>
> are the indexes that are given for each tract.<br>
><br>
> Please let me know if I am using the wrong atlas?<br>
><br>
> (or) How I could find the probability values of the tracts?<br>
><br>
><br>
> What is the difference between these files<br>
> JHU-ICBM-tracts-maxprob-thr50-2mm.nii.gz and<br>
><br>
> JHU-ICBM-tracts-maxprob-thr25-2mm.nii.gz<br>
><br>
> Thanks in advance.<br>
><br>
><br>
><br>
><br>
><br>
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><br></blockquote></div>