Hi Juke - You can convert path.pd.nii.gz to a probability by normalizing it to a sum of 1. The numbers in there are the number of occurrences of the path in any specific voxel, among the 1000 or so paths that are sampled by the MCMC algorithm.

Hope this helps, a.y

Dear Dr. Yendiki and TRACULA experts,

I was wondering what the unit of posterior distributions of reconstructed paths? By looking at the intensities, it ranges from 0 to ~150. I thought this is supposed to be a probability, but it's not? If it's in arbitrary unit, should I z-score them in order to show PD maps across subjects?

Thanks for your help in advance.

-- Juke Cha, M.S. Ph.D Candidate, Program in Neuroscience Laboratory for Computational Neurodiagnostics (LCN)http://www.lcneuro.org/ Dept of Biomedical Engineering Stony Brook University School of Medicine email: cha@lcneuro.org office: 631-632-1992 fax: 631-632-3222 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer