[FieldTrip] [Filedtrip] Openmeeg and MEG

[Jean-Michel Badier]

Thanks Alex,

/cfg = [];//
//cfg.method = 'singleshell';//
//cfg.method = 'openmeeg';//
//vol = ft_prepare_headmodel(cfg, segmentedmri);//
/
Will work fine but and make the calls to openmeeg but:

/cfg                 = [];//
//cfg.grad            = grad;//
//cfg.vol             = vol;//
//cfg.reducerank      = 'no';//
//cfg.channel         = SELECTED_CHANNELS;//
//cfg.grid.resolution = 1.0;   % use a 3-D grid with a 1 cm resolution//
//[grid] = ft_prepare_leadfield(cfg);//
/
will generate the following errors:

/Error using ft_prepare_vol_sens (line 296)//
//MEG not yet supported with openmeeg//
//
//Error in prepare_headmodel (line 79)//
//[vol, sens] = ft_prepare_vol_sens(vol, sens, 'channel', cfg.channel, 
'order', cfg.order);//
//
//Error in ft_prepare_leadfield (line 123)//
//[vol, sens, cfg] = prepare_headmodel(cfg, data);/

Your example code in the openmeeg page will generate the same error.

The reason I am asking (beside the fact I like openmeeg ;-) ) is the 
fact that found differences in some results that I tried to reproduce 
with the Nolte method. I need to look at that more in more details.

Thanks again

Jean-Michel



Le 08/09/13 18:39, Alexandre Gramfort a écrit :
> hi Jean-Michel,
>
> I did not touch the OpenMEEG bindings for a while so it can
> have been broken by more recent commits. Nolte's method
> is a good alternative.
>
> Best,
> Alex
>
>
> On Fri, Sep 6, 2013 at 3:46 PM, Jean-Michel Badier
> <jean-michel.badier at univ-amu.fr> wrote:
>> Dear FT and Openmeeg users,
>>
>> I seems that fieldtrip does not support (anymore ? it seems it was possible
>> in the past) Openmeeg for MEG.
>> Does it means that the Nolte  or the multiple spheres approaches are
>> sufficient and do not require extra calculation?
>> I wonder in some parts of the brain.
>>
>> Is this integration scheduled sometimes?
>>
>> Thanks
>>
>> Jean-Michel
>> --
>>
>>
>> Jean-Michel Badier
>>
>> Laboratoire de MagnétoEncéphaloGraphie
>> Institut de Neurosciences des Systèmes - INSERM UMR 1106
>> http://ins.medecine.univmed.fr/
>>
>>
>>
>> Service de Neurophysiologie Clinique. CHU Timone
>>
>> Hôpital de la Timone  264, rue Saint Pierre 13385 Marseille Cedex 5
>>
>> 33 (0)4 91 38 55 62
>>
>>
>>
>>
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-- 


Jean-Michel Badier

Laboratoire de MagnétoEncéphaloGraphie
Institut de Neurosciences des Systèmes - INSERM UMR 1106
http://ins.medecine.univmed.fr/

Service de Neurophysiologie Clinique.CHU Timone

/Hôpital/de la /Timone/264, rue Saint Pierre 13385 Marseille Cedex 5

33 (0)4 91 38 55 62

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