[FieldTrip] leadfields MNI-coordinates

Stan van Pelt s.vanpelt at psych.ru.nl
Mon Sep 22 12:44:11 CEST 2014

Dear FieldTrippers,


For sourceconstruction (CTF275 MEG data) at specific ROIs, I want to
compute leadfields at specific (MNI-)coordinates in the brain. I am trying
to find out how that is most easily done using FieldTrip


- The most intuitive way seems to me to warp the MNI template to the
individual's brain
vidual_head_space_that_are_all_aligned_in_mni_space) , and then apply the
warping parameters to the ROI's MNI-coordinates, and enter the subsequent
CTF-coordinates into ft_prepare_leadfield. However, I am not sure where
exactly I can find these parameters, and how to apply them. Are these the
ones in [gridsrc].params (output ft_sourcemodel)?

- Alternatively, should I run ft_volumenormalise to warp the brain to
MNI-space, and then inversely apply the warping parameters to the ROI's
MNI-coordinates? Again, where can I find the warping parameters in this
case, and how should they be applied?





Stan van Pelt, PhD
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognition
Montessorilaan 3, B.01.34
6525 HR Nijmegen, the Netherlands
tel: +31 24 3616288 

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