[FieldTrip] BTI to MNI coordination

[Schoffelen, J.M. (Jan Mathijs)]

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<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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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