[Freesurfer] Tracula: Small Tracts

Hi List,

I recently ran a group of around 70 subjects through trac-all. I have started to check the results, and have noticed that Tracula will often produce a tract with a really small volume and a posterior distribution that consists of just 0s and 1000s. When this occurs, the end point images usually contain only one voxel greater than 0. I am not sure what, if anything, is going wrong. The original recons are all of good quality, and the registrations to MNI space look good (the end point images look fine in MNI space as well). I also noticed this same issue in the right SLFP (bbregister version) of the Tracula tutorial subject.

Is this a fixable error, or is it actually expected behavior? Thanks for any help.

- Tyler