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Hi, This is explained in the wiki entry for atlasquery under "Outputs": http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Atlasquery All the best, Mark On 5 May 2014, at 14:38, Vera Steinheuser <[log in to unmask]> wrote: > Dear FSL-users, > > I have a question regarding the labels in the JHU ICBM-DTI-81 atlas. > > In my results fractional anisotrophy correlates with the Stroop-test (cognitive measure of interference) in the following structures : > > beo-04> atlasquery -a "JHU ICBM-DTI-81 White-Matter Labels" -m Maske_Stroop-FA.nii > Unclassified:1.84697 > Anterior limb of internal capsule L:36.9393 > Anterior corona radiata L:55.6728 > External capsule L:5.5409 > > > As you can see, the atlas assigns a value to each structure and I found the follwing explanation about it: ... the atlas assigns a unique label, one of integer values from 0 to 50, to each voxel in the ICBM-DTI-81 space to indicate that the voxel belongs to one of 50 well-documented deep white matter tracts. > > First of all: If the values are from 0 to 50, why do I get a value of 55.6728 in the anterior corona radiata? > > Secondly: What is the right way of interpreting the values? > > Looking forward to an explanation! :-) > > Vera