[Mne_analysis] Pial and inner skull surfaces intersecting

[dgw]

Hi Kambiz,

The pial and inner skull surfaces intersecting is not a problem given
the coarseness of our forward models. In practice these two surfaces
can and do touch one another in the head. Pushing the surfaces out
would only create additional error in your solution. The only
important thing is that you are using a reasonable value for the
mindist option (which relates the white surface: the source space) to
your BEM surfaces.

HTH
D

On Mon, Nov 3, 2014 at 2:47 PM, Kambiz Tavabi <ktavabi at uw.edu> wrote:
> Greetings,
> I've noticed that the pial and inner skull surfaces in my data set are
> intersecting. I am using FLASH 5 and 30 volumes to create 3-layered BEM
> using the sequence of mri_make_bem_surfaces & mne_watershed_bem with the
> default arguments after the necessary registration (with T1) and conversion
> (brainmask & T1 --> cor) routines. It appears that both inner and outer
> skull tables need to be pushed further out toward the outer skin (which is
> looking fine). Does any one have any ideas how this can be done e.g., using
> a different preflooding argument for mri_watershed or tweaking some other
> parameter; and does it have to be done outside the MNE convenience script?
>
> Thanks in advance
> Kambiz
>
>
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