[FieldTrip] Coordsys problems CTF and SPM

[Nicholas A. Peatfield]

Hi Arjen,

Yeah I looked into that but spm to ctf is not supported. And changing the
grads to spm seems also not possible. Unless I use ft realignsens but the
behaviour of that seems a little weird in my experience, and seems more
suited to electrodes.

Cheers

Nick

On Sep 23, 2016 7:35 PM, "Arjen Stolk" <a.stolk8 at gmail.com> wrote:

> Hi Nick,
>
> You may want to have a look at ft_convert_coordsys which can switch
> volumes between different coordinate systems.
>
> Best,
> Arjen
>
> On Sep 23, 2016, at 4:55 PM, Nicholas A. Peatfield <
> nick.peatfield at gmail.com> wrote:
>
> Hi all,
>
> I'm getting into a problem wherein I have headmodel that are in SPM space
> and the grads are in CTF space. I would usually keep all the headmodels in
> CTF space and align based on that but for this dataset and the format of
> the MRIs,POS etc... there seems to be some problems (could take longer to
> explain but lets keep this brief).
>
> So this of course leads to the issue that the grad and the headmodel
> within beamformer_lcmv is misaligned by 90 degrees, which is of course not
> good. Is there a quick solution that I have not come across to either
> convert the headmodel to ctf or convert the grad structure to spm coordsys?
> When I specify in the ft_prepare_sourcemodel I explicitly say (cfg.coordsys
> = 'ctf') but the outputted sourcemodel is still misaligned between the
> headmodel and the grads (see attached image - oh and the lf is also
> misaligned of course).
>
> Any help would be greatly appreciated. And I hope that this question
> hasn't come up before as I did quite a bit of google searching before
> sending this email.
>
> With Regards,
>
> Nick
>
>
> <image (3).png>
> --
> Nicholas Peatfield, PhD
>
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