[FieldTrip] fixed dipole orientation for MNE

Eelke Spaak eelke.spaak at donders.ru.nl
Tue Jun 18 15:16:41 CEST 2013

Dear Yuval,

The LCMV and DICS beamforming implementations in FieldTrip support
cfg.<method>.fixedori = 'yes', where <method> is either 'lcmv' or
'dics'. This will compute a filter which constrains each dipole to
point in the strongest orientation. For SAM I think this is not
implemented, and for MNE I have no clue.

Does this answer your question? Or are you lookling for another type
of fixed orientation, maybe based on anatomy or so?


On 18 June 2013 14:58, Yuval Harpaz <yuvharpaz at gmail.com> wrote:
> Dear group
> I would like to ask again
> (http://mailman.science.ru.nl/pipermail/fieldtrip/2011-February/003456.html)
> about head model with fixed dipole orientation (obtained from freesurfer),
> as I saw no reply to the previous message.
> I understand that there is no civilized way, currently, to tell MNE or
> beamforming to use fixed orientation, or am I wrong?
> applying 'sam' I managed to set dipole orinetation by making a dip.mom field
> in addition to dip.pos and by
> gain = lf;
> instead of the existing
> gain = lf * UnitMDip';
> note that here lf is a vector (no 3 columns).
> However this is patchy and not thorough. So can you please tell me if there
> is a way to do it with regular ft functions?
> thank you
> Yuval
> Dr .Harpaz
> BIU MEG lab
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