[Mristudio-users] Probability atlas ?

[susumu mori]

Hi Tejasvi,

I must admit that I'm not familiar with the exact data format you can
download from the FSL website. I thought the tractography atlases are
scaled 0-1....

>From www.mristudio.org, you can download RoiEditor, which comes with 4
different types of atlases. Three of them, ICBM-DTI-81, JHU-GA, and
JHU-SS, also have probabilistic tract maps. For the JHU-SS atlas,
there is also a comprehensive set of tract probabilistic maps for more
than 40 tracts, which you can download from our website. Please
contact Yajing for the location

On Thu, Mar 24, 2011 at 10:21 PM, Tejasvi Ramanand
<tejasviramanand at gmail.com> wrote:
> Hi,
>
>  I am new to the field of DTI. I am trying to use probability atlas for some
> data analysis.
>  I downloaded the JHU atlas from the FSL website.
>  There are 2 JHU White matter atlases.
>  1)JHU ICBM-DTI-81 White-Matter Labels
>  2) JHU White-Matter Tractography Atlas
>
>  From what I understand JHU White-Matter Tractography Atlas, is a
> probability atlas.
>  So, for every voxel in each tract (20 tracts) specified  there should be a
> 0 to 1 probability value.
>  This probability will determine the probability of that voxel belonging to
> that particular tract.
>  But, where could I find the probability values?
>  When I use DTIStudio to open the atlas, all I could see as the intensity
> are the indexes that are given for each tract.
>
>  Please let me know if I am using the wrong atlas?
>
>            (or) How I could find the probability values of the tracts?
>
>
>  What is the difference between these files
> JHU-ICBM-tracts-maxprob-thr50-2mm.nii.gz  and
>
>            JHU-ICBM-tracts-maxprob-thr25-2mm.nii.gz
>
> Thanks in advance.
>
>
>
>
>
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