Re: [Freesurfer] mri_watershed regions appearing round edge, freesurfer 4.0.2

2008-08-05 Thread Bruce Fischl
Hi Ian, does this mess up the ?h.white or ?h.pial surfaces? Or the aseg.mgz? If not, I wouldn't worry about it. cheers, Bruce On Tue, 5 Aug 2008, Ian Malone wrote: To illustrate the issue, this is a slice from one of the problematic volumes. The blue outlines surround non-zero voxels, the re

Re: [Freesurfer] mri_watershed regions appearing round edge, freesurfer 4.0.2

2008-08-01 Thread Ian Malone
It's not terrible; it can be worked around. But it does feel more like a bug than a feature, as these voxels are un-connected with any in the brain. It looks a bit like the edge of a bounding box. Thanks, Ian Bruce Fischl wrote: Hi Ian, mri_watershed minimizes a risk functional in which we

Re: [Freesurfer] mri_watershed regions appearing round edge, freesurfer 4.0.2

2008-07-30 Thread Bruce Fischl
Hi Ian, mri_watershed minimizes a risk functional in which we weigh the cost of leaving non-brain voxels to be much less than stripping true brain ones, so it does sometimes leave stuff around. Is this causing any problems? Bruce On Wed, 30 Jul 2008, Ian Malone wrote: Hi, Has anyone enco

[Freesurfer] mri_watershed regions appearing round edge, freesurfer 4.0.2

2008-07-30 Thread Ian Malone
Hi, Has anyone encountered this before? I have a few volumes for which mri_watershed output volumes are fine apart from some non-zero voxels near the edges (which are not connected to the brain). The volumes are in transverse format and the most noticeable effect is some inferior slices (ne