[FieldTrip] grid problem

[Elena Orekhova]

Dear fieldtrippers,

I try to construct leadfield grid using ft_prepare_leadfield.
I use a template MRI (/spm8/canonical/single_subj_T1.nii) and template electrode positions (subsample of /template/electrode/standard_1005.elc).  The resulting grid covers only part of the brain. My attempts to extend it manually using cfg.grid.xgrid, cfg.grid.ygrid, cfg.grid.zgrid do not help. The grid is still too small (see the attached figure).

My code is:
cfg                 = [];
cfg.vol             = vol;
cfg.channel        =  {'all', '-HEOG', '-VEOG'}
     cfg.grid.xgrid      = [ -80:10:80];
     cfg.grid.ygrid      = [ -100:10:100];
     cfg.grid.zgrid      = [ -110:10:80];
[grid] = ft_prepare_leadfield(cfg, data);

Why this happens and what may I do wrong?
I am new to the Fieldtrip and I would appreciate any help very much.
Thanks,

Elena

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