[FieldTrip] Forward model EEG no MRI

[Julian Keil]

Dear Sophia,

Fieldtrip comes with a number of precomputed Headmodels as well as standard MRIs which you can use (take a look into the „forward“-folder in the FT directory).
You just have to make sure, your electrodes fit to the headmodels, but you would have to do this with a „real“ MRI as well.

Good luck,

Julian

> Am 12.12.2017 um 17:24 schrieb Irene Sophia Mayer <mi_mayer at gmx.de>:
> 
> Dear Fieldtrippers,
> 
> I am attempting to do source reconstruction with Fieldtrip for the first time. I have EEG data but no MRI, just measurements of the electrode positions (with Zebris). However, I got already stuck at creating the forward model.
> 
> Do I need to prepare my own sourcemodel with ft_prepare_sourcemodel or can I use the default options in ft_prepare_leadfield?
> 
> All tutorials for creating a headmodel use an MRI, how can I do it without MRI images of my subjects?
> 
> I have tried to use ft_prepare_headmodel with
> headmodel = ft_prepare_headmodel(cfg, elec) with the output of FT_READ_SENS  <http://www.fieldtriptoolbox.org/reference/ft_read_sens>headmo
> elec =
>     chanpos: [62x3 double]
>     elecpos: [62x3 double]
>       label: {62x1 cell}
>        type: 'eeg1005'
>        unit: 'mm'
> 
> Unfortunately, it first told me: Either a segmentated MRI or data with closed triangulated mesh is required as data
> input for the bemcp, dipoli or openmeeg method, and when I tried other methods, I got: The data input might already be a sensor description. Reference to non-existent field 'outputfile'
> 
> I would be thankful for tips on how to do this!
> 
> Best,
> Sophia
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