[FieldTrip] Creating a BEM volume conduction model of the head for source-reconstruction of EEG data related question

[Schoffelen, J.M. (Jan Mathijs)]

Hi Anik,


On 29 May 2019, at 20:36, Anik Das <anik.nicks at gmail.com<mailto:anik.nicks at gmail.com>> wrote:

I was working with "Creating a BEM volume conduction model of the head for source-reconstruction of EEG data" founded from: http://www.fieldtriptoolbox.org/tutorial/headmodel_eeg_bem/ .I've some questions regarding this
1. Is the head-model(only for vol.bnd(3) coordinates) origin in figure is (0,0,0) ?

Well, the origin by definition is (0,0,0), that’s why it’s called ‘origin’ :). This is independent of the object.

2. if so, does the x, y axis for origin (0,0,0) intersect the points  ‘Nz’, ‘LPA’ and ‘RPA’ like ctf coordinate system(http://www.fieldtriptoolbox.org/faq/how_are_the_different_head_and_mri_coordinate_systems_defined/)?
<image.png>

I don’t know. You can evaluate this yourself, using the ft_determine_coordsys function. To me, it looks as if the coordinate system is acpc-based RAS. But I could be wrong.

Best wishes,
Jan-Mathijs



_______________________________________________
fieldtrip mailing list
https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
https://doi.org/10.1371/journal.pcbi.1002202

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20190603/c59b02e1/attachment-0001.html>
-------------- next part --------------
_______________________________________________
fieldtrip mailing list
https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
https://doi.org/10.1371/journal.pcbi.1002202