[Freesurfer] Cortical labels for WM seeding

2013-09-09 Thread Sean Hatton
Hello FS Gurus, I would like to export FS labels as seed regions for deterministic tractography in TrackVis (probabilistic is not appropriate in this investigation). I run mri_label2vol with “--proj abs -4 0 .1” to try and grow the label into the WM and exclude GM. While I get a biologically

Re: [Freesurfer] Cortical labels for WM seeding

2013-09-09 Thread Anastasia Yendiki
Hi Sean - Do you mean that the streamlines go through non-brain voxels? You could you a slightly dilated version of the aparc+aseg as a mask. You can use bbregister to map it to the subject's DWI space. a.y On Mon, 9 Sep 2013, Sean Hatton wrote: Hello FS Gurus, I would like to export FS

Re: [Freesurfer] Cortical labels for WM seeding

2013-09-09 Thread Sean Hatton
Great, I will give that a shot. In the seeding ROI should I combine the gm and wm labels or is the GM sufficient to encapsulate, say, the superior temporal gurus GM and WM? Anastasia Yendiki ayend...@nmr.mgh.harvard.edu wrote: Hi Sean - Do you mean that the streamlines go through non-brain

Re: [Freesurfer] Cortical labels for WM seeding

2013-09-09 Thread Anastasia Yendiki
I'd probably try GM plus a (DWI-sized) voxel or so into the WM. On Mon, 9 Sep 2013, Sean Hatton wrote: Great, I will give that a shot. In the seeding ROI should I combine the gm and wm labels or is the GM sufficient to encapsulate, say, the superior temporal gurus GM and WM? Anastasia

Re: [Freesurfer] Cortical labels for WM seeding

2013-09-09 Thread Bruce Fischl
Hi Sean I think using mris_expand with a negative number is the better way to do this. Then use the resulting surface for the seed. It should prevent the surface from passing through itself (which is what you are seeing) cheers Bruce On Mon, 9 Sep 2013, Sean Hatton wrote: Hello FS Gurus,