[FieldTrip] leadfields MNI-coordinates

[Eelke Spaak]

Hi Stan,

Have a look at this recent thread on the list (4 messages, Tom and me,
this is the starting message):
http://mailman.science.ru.nl/pipermail/fieldtrip/2014-August/008362.html
I think that might help you.

Groetjes,
Eelke

On 22 September 2014 12:44, Stan van Pelt <s.vanpelt at psych.ru.nl> wrote:
> 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
> (http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_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?
>
>
>
> Best,
>
> Stan
>
>
>
> -
> 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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