[Mristudio-users] Probability atlas ?

[Yajing Zhang]

Hi, Tejasvi,

As for the probabilistic tract maps, you can download from the following
website, and follow the instructions on the page to use these data.
http://lbam.med.jhmi.edu/cmrm/Data_Yajing/fiberMenu.htm .

Best regards,
Yajing



On Fri, Mar 25, 2011 at 9:32 PM, susumu mori <susumu at mri.jhu.edu> wrote:

> 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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>
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