[FieldTrip] leadfields MNI-coordinates
Pelt, S. van (Stan)
stan.vanpelt at donders.ru.nl
Tue May 19 11:09:09 CEST 2015
Your code actually looks fine to me. Some things that I could think of:
1. Did you specify cfg.coordinates=’mni’ before applying ft_volumenormalise?
2. Did you select the right volumes for plotting? So
a. For CTF head space:
% make a figure of the single subject headmodel
b. And for MNI-space:
This should lead to the same anatomical locations.
Hope this helps!
From: fieldtrip-bounces at science.ru.nl [mailto:fieldtrip-bounces at science.ru.nl] On Behalf Of Barbara Haendel
Sent: vrijdag 15 mei 2015 10:27
To: fieldtrip at science.ru.nl
Subject: [FieldTrip] leadfields MNI-coordinates
I found this very nice thread on warping between spm and ctf space (thanks Jan-Mathijs and Stan) and at first sight it seems to work fine (numbers match after applying warping back and forth) but when I try to navigate to the spot in the plotted figure the point of interest seems not to be the same.
% Inverse warping
mnipos=[-48 -75 8]; % [46 -78 6]; MT
-8.6110 55.6190 50.0473
I plotted either (see .jpg)
A. the source (source = ft_sourceanalysis(cfg, freq));
B. the interpolated source (sourceInt = ft_sourceinterpolate(cfg, source , mri_realign);
C. the normalized source (sourceIntNorm = ft_volumenormalise(cfg, sourceInt);
and manually navigated to the respective coordinates. While for the normalized source the location makes sense (area MT) the location for A and B seems different.
Is there any obvious mistake I’m overlooking?
Thanks a lot!
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