Jodie, you might also look into using the white matter parcellation. That would allow you to select the WM from a particular gyrus. doug On 01/29/2013 03:31 PM, Jodie Davies-Thompson wrote:
Dear Freesurfer users and experts,
We are attempting to grow a mask that we have created in FSL, to expand it into white matter.
At first, we tried this in FSL using the dilM command which dilated the size of the mask by n voxels. We then multiplied this by a segmented white matter mask (again, created in FSL) so only the white matter voxels were included. However, a problem with this method, is that if a mask is over a gyri (as most of our masks are), then diluting the mask in a non-inflated brain causes some voxels from an adjacent gyri to be included.
What we would like to be able to do, is to dilute the mask using the inflated white matter brain created by Freesurfer, and then to take this back into FSL space; thereby, allowing us to create a mask of which includes the true surrounding white matter rather than white matter from adjacent gyri.
Hope this makes sense!? Does anyone know how to do this or could point us in the right direction?
Cheers,
Jodie
Jodie Davies-Thompson, Postdoctoral Fellow
Department of Ophthalmology & Visual Sciences
UBC/VGH Eye Care Centre
2550 Willow Street
Vancouver, BC, V5Z 3N9
Canada
Tel: 604-875-4111 Tel:604-875-411 ext 69003
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer