[FieldTrip] Fwd: source localization - MNI coordinates

Stan van Pelt stan.vanpelt at fcdonders.ru.nl
Wed Aug 8 16:14:38 CEST 2012

Hi Alina,

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?
> Best,
> Alina

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
Website: www.ru.nl/donders/
Phone:  (+31) (0)24 36 10981
Fax:    (+31) (0)24 36 10989

More information about the fieldtrip mailing list