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If you want to calculate a probability of connection between A and B, then you want to use e.g. A as a seed and B as a waypoint. Then the number stored in the file "waytotal" is the number of streamlines that make it from A to B. This number, divided by the total number of streamlines, is your probability.

On 8 May 2013, at 20:59, Samantha C. <[log in to unmask]> wrote:

Hello everyone,
I am interested in finding out the mean probability that tracks exist between two ROIs (after using probtrackx). Would taking fslstats -M for the resulting fdt_paths be the correct method? I know that fslstats -M refers to the mean number of non-zero voxels in fdt_paths but am having a hard time understanding how this relates to probability values.

Thank you for your help!
Sam

Saad Jbabdi

University of Oxford, FMRIB Centre

JR Hospital, Headington, OX3 9DU, UK

(+44)1865-222466 (fax 717)