[FieldTrip] mne source reconstruction

[qi li]

Jan and Jörn:

Thanks a lot for your answers! You did understand my questions pretty
well. I actually tried to use ft_sourceinterpolate to find the voxel
index without success. The error message is like

'Reference to non-existent field 'sphereradius'.

Error in ft_sourceinterpolate (line 203)
  interpmat = interp_ungridded(functional.pos,
warp_apply(anatomical.transform, [X(:) Y(:) Z(:)]), ...'

On Thu, Aug 2, 2012 at 3:07 AM, jan-mathijs schoffelen
<jan.schoffelen at donders.ru.nl> wrote:
> Hi Qi,
>
> To follow up on Jörn:
>
> If you reconstructed the source activations on a mesh that represents the
> cortical surface, you first need to interpolate the functional data into a
> 3D volume, if you want to use ft_sourceplot for visualization. For this you
> need ft_sourceinterpolate.
> As an alternative, to visualize the results, you can use ft_sourcemovie.
> However, this function is under development so it may not give the most
> visually appealing results.
>
> Best,
>
> JM
>
>
> On Aug 2, 2012, at 8:52 AM, Jörn M. Horschig wrote:
>
> Dear Qi,
>
> Not quite sure if I understand your request correctly, but you can just
> rehape:
>     source.avg.pow = reshape(source.avg.pow, anatomical.dim);
> Then instead of being a vector, it will become a matrix.
>
> If that's not the answer you intended to get, please phrase your question
> differently :)
>
> Best,
> Jörn
>
> On 8/1/2012 7:33 PM, qi li wrote:
>
> Hi,
>
> Is there anyway to map the source space mesh back to voxel space so I
> can use the ft_sourceplot.
>
> After MNE source reconstruction, I have
>
> source =
>
>        time: [1x399 double]
>         pos: [8196x3 double]
>      inside: [1x8196 double]
>     outside: [1x0 double]
>      method: 'average'
>         avg: [1x1 struct]
>         cfg: [1x1 struct]
>
> I have 8196 mesh points but how to map it back to the anatomical voxel
> space? Thanks!
>
> Qi
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>
>
> --
> Jörn M. Horschig
> PhD Student
> Donders Institute for Brain, Cognition and Behaviour
> Centre for Cognitive Neuroimaging
> Radboud University Nijmegen
> Neuronal Oscillations Group
>
> P.O. Box 9101
> NL-6500 HB Nijmegen
> The Netherlands
>
> Contact:
> E-Mail: jm.horschig at donders.ru.nl
> Tel:    +31-(0)24-36-68493
> Web: http://www.ru.nl/donders
>
> Visiting address:
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> The Netherlands
>
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>
> Jan-Mathijs Schoffelen, MD PhD
>
> Donders Institute for Brain, Cognition and Behaviour,
> Centre for Cognitive Neuroimaging,
> Radboud University Nijmegen, The Netherlands
>
> Max Planck Institute for Psycholinguistics,
> Nijmegen, The Netherlands
>
> J.Schoffelen at donders.ru.nl
> Telephone: +31-24-3614793
>
>
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