[FieldTrip] Using default head and source models for source reconstruction

[mikkelcv at drcmr.dk]

Hi Jan

If you are using a standard EEG layout, then it is not problem to use a template MRI and source space (beyond the inherent discrepancy between the template anatomy and the actual subject’s anatomy). There is a short tutorial on using templates for source reconstruction here: https://www.fieldtriptoolbox.org/template/sourcemodel/

If you got FieldTrip from Git, then you already should have a lot of templates that you can use right out of the box. You can see them here: https://github.com/fieldtrip/fieldtrip/tree/master/template

The only issues is to make sure that your EEG layout and the template MRI are in the same coordinate system. That you can find how to do on the regular source reconstruction tutorials, e.g.: https://www.fieldtriptoolbox.org/tutorial/headmodel_eeg_bem/#automatic-alignment

Best regards


Fra: fieldtrip <fieldtrip-bounces at science.ru.nl> på vegne af Jan Ostrowski via fieldtrip <fieldtrip at science.ru.nl>
Dato: mandag, 21. marts 2022 kl. 10.07
Til: fieldtrip at science.ru.nl <fieldtrip at science.ru.nl>
Cc: Jan Ostrowski <j.ostrowski at uke.de>
Emne: [FieldTrip] Using default head and source models for source reconstruction
Hi there,

my name is Jan Ostrowski and I am working on crossmodal memory. I
conducted a study using a 64-Channel EEG setup, and would like to
explore the data using Fieldtrip's source reconstruction functionality.
However, due to my study design, I did not acquire individual MRI images
for solving the forward problem.

I'd like to know if it is possible to use some default templates for
that, as all tutorials assume that one has MRI images to work with. If
it is possible, then what templates should I use and how would I
implement it? As in: What steps of the process described in the
tutorials could I skip?

I understand that using default templates will make the results of the
source reconstruction less precise, and I am well aware that one should
be cautious when interpreting that. This is, however, going to be an
additional, exploratory analysis.

Any help with this is greatly appreciated!

Best,
Jan Ostrowski

--
Jan Ostrowski, M.Sc.
Department of Systems Neuroscience
University Medical Center Hamburg-Eppendorf
Martinistr. 52
Building W34, Room 320b
D-20246 Hamburg, Germany

--

_____________________________________________________________________

Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen Rechts; Gerichtsstand: Hamburg | www.uke.de
Vorstandsmitglieder: Prof. Dr. Burkhard Göke (Vorsitzender), Joachim Prölß, Prof. Dr. Blanche Schwappach-Pignataro, Marya Verdel
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