[FieldTrip] Fwd: source localization - MNI coordinates
Stan van Pelt
stan.vanpelt at fcdonders.ru.nl
Wed Aug 8 16:14:38 CEST 2012
I forward your question to the FT discussion list, because I do not have experience with interpreting the source localization coordinate values. e.g., I do not know if they are actually in MNI space.
----- Doorgestuurd bericht -----
> Van: "A.S. Peter (Alina)" <a.peter at fcdonders.ru.nl>
> Hi Stan,
> by visual inspection, I always thought that my source localization was
> quite ok, but now I actually looked with MRICron where the spm
> coordinates (=MNI coordinates, right?) are that fieldtrip outputs, and
> some are near occipital regions but outside the brain... I am puzzled.
> I tried linear ft_volumenormalize and also nonlinear, the MNI
> coordinates are somewhat different but the problem remains.
> I then went back to look at SAM which we did first and it seems there
> the sources were localized somewhat deeper/nicer than with LCMV
> anyhow, which also tells me it's probably not a fiducial problem. I
> think it may be partly my code (i.e. what I basically took from Avgis
> and looks like yours) but also partly conversion to MNI causing
> problems. Did you ever try to see the MNI coordinates for your data?
Stan van Pelt
Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen
Kapittelweg 29, 6525 EN Nijmegen, Netherlands
E-mail: stan.vanpelt at donders.ru.nl
Phone: (+31) (0)24 36 10981
Fax: (+31) (0)24 36 10989
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