[Mne_analysis] single-layer BEM model for EEG

[Le Wang]

Thanks again! Which FLASH protocol do you recommend for creating BME models
for EEG source localization?

So I've talked with our (f)MRI people about adding a single FLASH scan in
their protocol. They are mainly concerned about the time requirement.

 I found a FLASH protocol on
https://surfer.nmr.mgh.harvard.edu/fswiki/FreeSurferWiki?action=AttachFile&do=get&target=FreeSurfer_Suggested_Morphometry_Protocols.pdf,
which takes about 8.5 min.

I don't know if this is the most up-to-date FLASH protocol at Martinos --
Is there a newer FLASH protocol that can produce decent skull boundaries
and takes less time to run?

Another question is whether there's a FLASH protocol already imported on
Bay 1 (Skyra scanner) at Martinos (where our MRI team run MPRAGE). If not,
is it ok to run FLASH and MPRAGE on different scanners for the same subject?

Thanks!


On Thu, Oct 23, 2014 at 2:25 PM, dgw <dgwakeman at gmail.com> wrote:

> Hi Le,
>
> You can create decent BEM models from a single MEFLASH at 5 degrees
> (some users have even reported good results from a single echo). Which
> would save you half the time.
>
> HTH
> D
>
> On Thu, Oct 23, 2014 at 2:18 PM, Le Wang <lwang at bu.edu> wrote:
> > Hi, Alex,
> >
> > Thank you very much for the confirmation. I will try to get a 3-layer
> model
> > from just the MPRAGE (no FLASH for future subjects due to time
> constraints).
> >
> > Best
> > Le
> >
> > On Thu, Oct 23, 2014 at 3:33 AM, Alexandre Gramfort
> > <alexandre.gramfort at telecom-paristech.fr> wrote:
> >>
> >> hi Le,
> >>
> >> indeed you cannot use a homogeneous model in EEG forward calculations.
> >>
> >> it is not supported.
> >>
> >> Best,
> >> Alex
> >>
> >>
> >> On Wed, Oct 22, 2014 at 11:11 PM, Le Wang <lwang at bu.edu> wrote:
> >> > Hi,
> >> >
> >> > Would it be possible to calculate an EEG forward solution with
> >> > single-layer
> >> > BEM in MNE?
> >> >
> >> > I know it's generally a bad idea. I just want to see how bad the
> source
> >> > localization is with the single-layer BEM.
> >> >
> >> > I have the MRI scans (Flash5 and Flash30) and the 3-layer BEM for the
> >> > subject. The source localization of auditory N1 works great with the
> >> > 3-layer
> >> > BEM. I generated a single-layer BEM and tried to use it to compute a
> >> > forward
> >> > solution, but MNE do_forward_solution returned with error.
> >> >
> >> > Thanks!
> >> >
> >> > Best
> >> > Le
> >> >
> >> > ---
> >> > Le Wang, Ph.D.
> >> > Boston University
> >> > Boston, MA, 02215
> >> >
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