[FieldTrip] Coordsys problems CTF and SPM

Arjen Stolk a.stolk8 at gmail.com
Sat Sep 24 03:46:04 CEST 2016

Hi Nick,

You may want to have a look at ft_convert_coordsys which can switch volumes between different coordinate systems. 


> 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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