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 Yendiki <ayend...@nmr.mgh.harvard.edu> wrote:
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 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
plausible ROIs and plenty of good streamlines, I do get some stray
streamlines that jump across the sulci into adjacent gyri which (I have
read) is an artefact of seeding from GM. Have I got the right approach?
Should I create an inverse intracranial volume mask as an exclusion
mask? Something else?
Kind regards,
Sean Hatton
Brain & Mind Research Institute
University of Sydney, Australia.
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