[Mne_analysis] single-layer BEM model for EEG

[dgw]

Hi Le,

The one I know of on bay 1 takes 8:25. If you want to do some further
inquiries offline (email me @ dwakeman at nmr.mgh.harvard.edu ) and we
can inquire together from the sequence programmers here at Martinos.

HTH
D

On Wed, Oct 29, 2014 at 3:22 PM, Le Wang <lwang at bu.edu> wrote:
> 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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