[FieldTrip] ft_determine_coordsys does not return coordinate system

Arjen Stolk a.stolk8 at gmail.com
Sat May 19 17:57:41 CEST 2018

Hi Thomas,

First thing that comes to my mind is step 3 of this ECoG tutorial
<http://www.fieldtriptoolbox.org/tutorial/human_ecog>, which demonstrates
how to determine the coordinate system of an anatomical image. You'll need
Box 2 from the preprint
and Video 1 <https://www.youtube.com/watch?v=K9rwGWr-ZnA>.  Video 2
<https://www.youtube.com/watch?v=KvmilLY9MiE> addresses your second point,
on how to use the coordinate system to find left and right.

Hope that helps,

On Sat, May 19, 2018 at 7:04 AM, Thomas Radman <radman.thomas at gmail.com>

> Hello,
> I would like to use individual MRIs to perform source analysis on EEG
> data.
> The problem I have is when importing dicoms into fieldtrip, and then using
> ft_determine_coordsys, the coordinate system is not returned.  How can I
> determine the coordinate system and align this to my EEG sensors?
> Also, to use ft_volumerealign in interactive mode to select fiducials I
> need to know which side is right and which is left.  Is it possible to do
> this if I did not have a vitamin E marker in my scans?
> Thank you,
> Tom Radman
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> fieldtrip at donders.ru.nl
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