[Mne_analysis] mne_make_eeg_layout

Vema Krishnamurthy, Santosh Santosh.VemaKrishnamurthy at nrc-cnrc.gc.ca
Fri Sep 23 14:24:28 EDT 2011
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Hello Matti,

Thanks for your reply. I also manually did the process explained in this link to calculate the azimuthal equidistant projection locations, but when I plot the peojected locations in matlab they don't look like the template EEG layout file which I attache to this email. Are the uk and vk the 2D projected locations or should I do any other transformations?

Thanks and Regards,
Santosh Vema KrishnaMurthy, M.A.Sc
Medical Devices Engineer
NRC Institute for Biodiagnostics (Atlantic)
Elekta/IWK MEG Research office
Ph: (902) 470-3984

From: Matti Hamalainen [msh at nmr.mgh.harvard.edu]
Sent: Friday, September 23, 2011 2:23 PM
To: Vema Krishnamurthy, Santosh
Cc: mne_analysis at nmr.mgh.harvard.edu
Subject: Re: [Mne_analysis] mne_make_eeg_layout

Hi Santosh,

On Sep 23, 2011, at 1:09 PM, Vema Krishnamurthy, Santosh wrote:


I scanned the EEG cap using a laser scanner and I was able to get the locations of EEG electrodes in 3d (x, y, z) and I translated them into fiducial co-ordinate frame and then I wrote the EEG electrode locations to a fif file using fiff_write_dig_file and then I'm trying to use the mne_make_eeg_layout to make a layout file (convert the 3d co-ordinates into the 2d), so that I can label my EEG electrodes. But I'm getting error "Could not fine the channel information" when I run this code.

You need to:

1. Assign the EEG electrode coordinates to the channel information in a measurement file with this EEG electrode configuration:

mne_check_eeg_locations --file <measurement fif file> --dig <the file you saved with fiff_write_dig_file> --fix

2. Use the thus modified measurement file as input to mne_make_eeg_layout

- Matti


Matti Hamalainen, Ph.D.
Athinoula A. Martinos Center for Biomedical Imaging
Massachusetts General Hospital

msh at nmr.mgh.harvard.edu<mailto:msh at nmr.mgh.harvard.edu>

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