[Mne_analysis] Aligning sensor space with MRI

Tue Oct 19 14:45:56 EDT 2021

        External Email - Use Caution        

I'd recommend posting these questions to Discourse as you're likely to get
more responses that way. But in this case the problem appears to be that
you plotted an `fsaverage` STC on o non-`fsaverage` brain. STC vertices are
subject specific so this won't work without doing some morphing (which you
shouldn't need here most likely).

Eric

On Tue, Oct 19, 2021 at 2:35 PM Kadwani, Manorama <MKADWANI at mgh.harvard.edu>
wrote:

> Hi!
>
> I am trying to plot the sources for event related EEG from our subjects. I
> used a forward model from fsaverage MRI to get a uniform forward model for
> all subjects.
> The alignment of EEG and MRI coordinates looks good, but the inverse
> solution shows sources not covering the whole brain.
>
> Earlier, I had used patient-specific forward model and the sources were
> plotted on all the brain lobes. I am wondering if the fsaverage forward
> model has alignment issues.
>
> Does anyone have an idea what has gone wrong?
>
> Thanks,
> Manorama
>
> ------------------------------
> *From:* Kadwani, Manorama <MKADWANI at mgh.harvard.edu>
> *Sent:* Thursday, October 14, 2021 11:53 AM
> *To:* Discussion and support forum for the users of MNE Software <
> mne_analysis at nmr.mgh.harvard.edu>
> *Subject:* Re: [Mne_analysis] Aligning sensor space with MRI
>
> Gotcha, thank you!
> Manorama
> ------------------------------
> *From:* mne_analysis-bounces at nmr.mgh.harvard.edu <
> mne_analysis-bounces at nmr.mgh.harvard.edu> on behalf of Eric Larson <
> larson.eric.d at gmail.com>
> *Sent:* Thursday, October 14, 2021 10:43 AM
> *To:* Discussion and support forum for the users of MNE Software <
> mne_analysis at nmr.mgh.harvard.edu>
> *Subject:* Re: [Mne_analysis] Aligning sensor space with MRI
>
>
>         External Email - Use Caution
>
> They are projected onto the head surface during forward modeling.
>
> Eric
>
>
> On Thu, Oct 14, 2021 at 10:24 AM Kadwani, Manorama <
> MKADWANI at mgh.harvard.edu> wrote:
>
> Hi!
>
> I want to understand what happens if the EEG digitized points are not
> lying exactly on top of the skin/head surface while aligning EEG digitized
> points with MRI coordinates. I have aligned the fiducial points well, but
> some electrode points are in and some are out of the head surface.
> Are the exact electrode locations used for calculating distance between
> source and sensor space? Or the electrode locations projected onto the head
> surface?
>
> Thanks,
> Manorama
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