Hi John - The values are weighted (multiplied) by the probability distribution (path.pd.nii.gz) at the same voxel. So they are the expected values, from a probabilistic standpoint. The distribution is thresholded at 20% of its maximum by default (this is a parameter in dmri_pathstats).
Best, a.y
On Wed, 16 Sep 2015, John Anderson wrote:
Hi Anastasia, How the script "dmri_pathstats" compute the weighted FA, MD, AD, and RD values? I checked the command "dmri_pathstats" inside the file "trac-all.log" but I was unable to figure out how this weighting is working. Is it by multiplying the mean DTI metrics by the number of voxel? If my FA maps is "dtifit_FA.nii.gz" and my probabilistic distribution map for the cortico spinal tract is "path.pd.nii.gz" and I want to compute FA value using the command "fslstats" like: fslstats dtifit_FA.nii.gz -k path.pd.nii.gz -m ==== >This command will output the mean FA for the probabilistic distribution map. How can I weight this FA value using the previous command line? Bests, John Anderson
Senior Research Associate Psychological and Brain Sciences Dept. Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755 Phone: +1 (603) 646-9834 Fax: +1 (603) 646-1419