[FieldTrip] BTI to MNI coordination

[mehdy dousty]

Thank you very much. As you suggest after computing the inverse problem I
interpolate the atlas to the sourcemodel by the below commands:


atlas =
ft_read_atlas('/home/mehdy/Desktop/EEG-1/fieldtrip-20160417/template/atlas/aal/ROI_MNI_V4.nii');
cfg = [];
cfg.interpmethod = 'nearest';
cfg.parameter = 'tissue';
individual_sourcemodel3d1 =
ft_sourceinterpolate(cfg,atlas,individual_sourcemodel3d);

and then interpolate the result of source construction to the computed
source model , I mean individual_sourcemodel3d1:

cfg = [];
cfg.parameter = 'pow';
source_eloreta_disc_int1 =
ft_sourceinterpolate(cfg,source_eloreta,individual_sourcemodel3d1);

now the are the data parcellated? if it is so, how can I get the
parcellation labels?
Thanks





On Mon, Nov 7, 2016 at 12:59 PM Schoffelen, J.M. (Jan Mathijs) <
jan.schoffelen at donders.ru.nl> wrote:

> Mehdy,
>
> As I suggested in an earlier e-mail it’s most convenient to use
> ft_sourceinterpolate to interpolate the atlas onto the sourcemodel. To this
> end you can use the template sourcemodel that comes shipped with the HCP
> megconnectome software. Once you have managed to do this, you can directly
> look-up the anatomical labels of the dipole positions, because the dipole
> positions in the individual sourcemodels (in bti space) by construction
> coincide with the template after transformation into mni space. This is
> explained on page 30 of the HCP MEG manual. I suggest you to consult this
> in somewhat more detail.
>
> Best wishes,
> Jan-Mathijs
>
>
>
> On 07 Nov 2016, at 17:48, mehdy dousty <mehdy.dousty at gmail.com> wrote:
>
> Thanks for the answer. I am going to volumelookup the predefined
> sourcemodel which is provided by HCP, MEG_anatomy_sourcemodel_3d6mm.mat, to
> the ROI_MNI_V4, as the atlas has the MNI coordination systema and the
> sourcemodel has the bti coordinations system and there is no transform
> function in the sourcmodel to convert  bti to mni, what is your suggestion
> to do so?
> Thanks
>
> On Sun, Nov 6, 2016 at 1:02 PM Schoffelen, J.M. (Jan Mathijs) <
> jan.schoffelen at donders.ru.nl> wrote:
>
> ft_convert_coorsys is not accurate. Don’t use it if you want an accurate
> conversion.
> Best,
> Jan-Mathijs
>
> On 06 Nov 2016, at 19:39, mehdy dousty <mehdy.dousty at gmail.com> wrote:
>
> Thanks for the answer. how accurate to use ft_convert_coordsys (source,
> 'spm'), and if it is not, as there is no explanation on wiki unfortunately,
> how can I make this conversion .
> Thanks
> Mehdy
>
> On Sun, Nov 6, 2016 at 8:22 AM Pelt, S. van (Stan) <
> stan.vanpelt at donders.ru.nl> wrote:
>
> Hi Mehdy,
>
> You should use bti2spm for this. You can find more specific information on
> this on the HCP wiki website.
>
> Hope that helps.
>
> Stan
>
> > Op 6 nov. 2016, om 00:51 heeft mehdy dousty <mehdy.dousty at gmail.com>
> het volgende geschreven:
> >
> > Hello all,
> > The provided head model (MEG_anatomy_sourcemodel_3d6mm.mat) in the HCP
> (Human connectome project) has a 'BTI' coordination system. As I am going
> to parcellate the data by an atlas which has a coordination system of
> "MNI", and could not find any transformation between BTI and MNI, I am
> wondering if anybody knows what are my steps to do so?
> > Thanks
> > Mehdy
> > _______________________________________________
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> > fieldtrip at donders.ru.nl
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>
>
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