[FieldTrip] Beamforming in FieldTrip and Brainstorm

[Vladimir Litvak]

Dear Ioanna,

I'm not well familiar with Brainstorm but you could use SPM12 (
https://www.fil.ion.ucl.ac.uk/spm/) to make a template head model that you
could then easily use in FT (as SPM and FT share the same forward
computation code), See
http://www.fieldtriptoolbox.org/workshop/meg-uk-2015/fieldtrip-beamformer-demo/
for
an example of how you get the head model and sensors to FT. To generate the
head model it would be enough to convert an example of your data to SPM,
load it to '3D source reconstruction' interface and go through the sequence
of buttons there as described in the SPM manual (
https://www.fil.ion.ucl.ac.uk/spm/doc/manual.pdf, p 121). You only need to
get up to the 'Forward' button, choose EEG BEM, press 'save' and then you
do:

D = spm_eeg_load('dataset_name.mat');

% convert sensors and volume conduction model from SPM
volsens = spm_eeg_inv_get_vol_sens(D, 1, 'MNI-aligned', 'inv', 'EEG');
vol1    = volsens.EEG.vol;
sens1   = volsens.EEG.sens;

Best,

Vladimir

On Wed, Apr 17, 2019 at 11:08 AM Ioanna Zioga <i.zioga at qmul.ac.uk> wrote:

> Hi All,
>
>
> I'm Ioanna and I'm a PhD student in Queen Mary University of London, doing
> EEG research on music learning and creativity [image: :slight_smile:]
>
>
> My question is on using Brainstorm and FieldTrip interchangeably to do
> beamforming on EEG data recorded by a 64-channel EGI system.
>
> I haven't found an option to compute the cross-spectral density matrix for
> the beamforming in Brainstorm. On the other hand, with Brainstorm I could
> quite easily create a head model for the 64-channel EGI system my data were
> recorded with.
>
>
> Therefore, I was wondering if I could:
>
>    1. Calculate the cross-spectral density in Fieldtrip (ft_freqanalysis)
>    2. Create the head model in Brainstorm
>    3. Run the source analysis in Fieldtrip (ft_sourceanalysis) using the
>    head model from Brainstorm
>
> Q1: How can I use the head model (as computed in Brainstorm) in FieldTrip
> to run the ft_sourceanalysis function? What is the format that the head
> model structure should have?
>
> Q2: Does anyone have a FieldTrip head model for a 64-channel EGI system?
>
>
> Any help would be very much appreciated!
>
>
> Thanks so much in advance,
> Ioanna
>
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> https://doi.org/10.1371/journal.pcbi.1002202
>
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