Are your 83 regions set up in a single file with different indices for each ROI? If so, you can run mri_segstats; the summary file will indicate how many voxels are in each ROI.

On 11/13/15 11:45 AM, André Schmidt wrote:

Dear FS experts,

Using recon-all I defined 82 regions for a probabilistic tractography analysis. To address volume differences across regions, I like to normalize the obtained streamlines by the number of voxels in each regions. Is there an easy way to count voxels within each of my 82 regions?

Thanks for your help André

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