Hi Cochrane,

you could use mris_fill to generate a voxel-based representation of the interior of the pial surface at whatever resolution you want, then mri_morphology to erode it.

cheers Bruce

On Thu, 19 Jun 2008, Cochrane Jamison wrote:

I have been working on getting a volume created by mris_fill from the pial surfaces exported to be used in a dipole/current density analysis software package. I have succeeded in being able to concat both halves and have gotten the volumes loaded successfully into the software, but I need a bit better resolution. My question is this: Is there a way to erode the pial surface either before or after its creation? I need maybe 0.5 - 1mm of erosion so that each sulci is a bit more defined. The surface looks great, but in order to consider the grey matter in each sulci for the dipole/current density calculation, each sulci needs to be distinct. The only way that I can think about it is by eroding the grey matter by 0.5-1mm before I use the mris_fill command. I am not sure if this is even possible, or if it is where it would need to be done. Thanks for any help.

Cochrane