Hello,
I found a presentation by Matti H?m?l?inen dated 11/2007 (attached).
In the coregistration section, it mentions a smooth head surface for
forward modeling (one that I have been able to create using MNE
software), and an "accurate head surface for picking the fiducials."
It says that both can be generated automatically from MRIs, but I
haven't seen any mention of this surface in the manuals. It would be
most helpful to have access to these accurate surfaces. Thank you!
Megan Schendel
Hi Megan,
See Section 7.16.1 in the 2.5 version of the MNE Manual. This version
should be on your system. However, mkheadsurf is only available in the
newest FreeSurfer distributions.
- Matti
Hi Megan,
To get the high-res head surface for electrode registration you'll
need freesurfer 4.0 or later and the subject's T1 image. For example,
mkheadsurf -subjid S12 -srcvol T1.nii.gz
There are several ways to get BEM surfaces for the forward modeling,
one of them is described in the manual. I use FSL suite's bet2 and
betsurf utilities for that. They create triangular meshes
(subdivisions of icosahedron) for the three standard surfaces. You'll
need both T1 and T2 images.
Best,
Yury