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Hi Catherine,

As far as I know, what you see from atlasquery is not a proportion of content of voxel (or ROI), but the (estimated) probability of the voxel to be included in a certain class (region or label) considering individual variability since the atlas was made by averaging tract-masks of 28 normal subjects (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2724595/).

You may want to check to probabilistic maps of WM atlas to get a more clear idea.

Also note that the classification of WM bundles are not exclusive, so one voxel (124,91,104) has 76% of SLF and 53% of SLF (temporal), which can be included in both regions if we threshold > 0.50. The sum of the given probabilities isn't necessary 1. 


Best,
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Seung-Goo KIM

On 2, Apr, 2013, at 10:26 PM, SUBSCRIBE FSL Nucleos wrote:

Hi FSLers,

When the atlasquery output states 35% SLF_R (temporal part) and 32% SLF_R, does this mean that 67% is SLF_R with 35% of that specifically temporal part.

OR

Does it mean that at that ROI it is 35% SLF_R (temporal part) and 32% of that SLF_R (temporal part) is SLF_R.

Just looking for clarification.

Thank you,
Catherine