[Mne_analysis] Mne_analysis Digest, Vol 147, Issue 76

Kadwani, Manorama MKADWANI at mgh.harvard.edu
Wed Apr 29 17:45:59 EDT 2020
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Hi Alex,

I used digitized locations.

Manorama
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Today's Topics:

   1. Re: Help with DigMontage coordinates for EGI system
      (Alexandre Gramfort)


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Message: 1
Date: Tue, 28 Apr 2020 21:11:55 +0200
From: Alexandre Gramfort <alexandre.gramfort at inria.fr>
Subject: Re: [Mne_analysis] Help with DigMontage coordinates for EGI
        system
To: Discussion and support forum for the users of MNE Software
        <mne_analysis at nmr.mgh.harvard.edu>
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        <CADeotZqjK8Ha+xX2d0o62f0J_TV4m5Wn-HsFiMke3GZaCjhZBA at mail.gmail.com>
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hi Manorama

are you using default EGI xml locations or digitized locations?

if you use the template can you try:

montage = mne.channels.make_standard_montage(kind='EGI_256')

see:
https://mne.tools/stable/generated/mne.channels.make_standard_montage.html?highlight=read_dig_egi

Alex


On Tue, Apr 28, 2020 at 8:58 PM Kadwani, Manorama <MKADWANI at mgh.harvard.edu>
wrote:

> Hi all,
>
> I am using MNE v0.20 and trying to read electrode locations from an EGI
> system in .xml file format.
>
> For this purpose, I used the function "mne.channels.read_dig_egi".
> Whereas, my colleague has previously used "mne.channels.read_dig_montage"
> which is now discontinued in versions after v0.18. Both the functions
> return a DigMontage instance with a list of electrode number and their
> locations. Our issue is that the two montages have the locations with
> different values and different units; read_dig_egi uses 'mm' and
> read_dig_montage uses meters. Simply scaling is not enough as even then the
> numbers are different. Any ideas on why the two montages are different for
> the same EGI file?
>
> Another issue related to the coordinates: While aligning the EEG/MRI
> coordinates, my sensor points are way off from the head model. The points
> are invisible even after marking fiducials. ICL alignment does not work and
> gives an error that there was too large difference in matching. But when my
> colleague used the older function "read_dig_montage", the sensor points
> were visible and also aligned well to the head model.
>
> Let me know if I should provide more information. I have attached the two
> montage files, if that would be of any help.
>
> Thanks,
> Manorama Kadwani
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