[Mne_analysis] source strength of fitted dipole in source space

Alexandre Gramfort gramfort at nmr.mgh.harvard.edu
Tue Jan 29 03:19:54 EST 2013
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hi Tim,

if you have the source amplitude and orientation then you can get the M/EEG
estimates but matrix multiplication with the forward solution a.k.a.
gain matrix.
See the simulation module in mne-python:

https://github.com/mne-tools/mne-python/blob/master/mne/simulation/evoked.py

HTH
Alex

On Sat, Jan 26, 2013 at 12:29 AM, Tim Kunze <tim.kunze at tu-ilmenau.de> wrote:
> Hi,
>
> I am trying to model the influence of a (in mne_analyze) fitted dipole
> to an existing measurement. The aim is to subtract the influence of the
> dipole from the measurement in the sensor space.
>
> The dipole fit delivers the location and the orientation of the
> dipole. The orientation per room direction is expressed in nA. I now
> calculate the forward solution by multiplying the dipole with the
> leadfield to get the influence in the sensor space which is then
> subtracted from the actual measurement.
>
> My question concerns the source strength of the dipole: is it
> necessary to normalize the source strength of the dipole (sqrt(Qx^2 =
> Qy^2 + Qz^2)= Q = 1) or do I just use the strength per room direction
> from the fit to define the activity of the dipole per direction?
>
>
> Thanks a lot for your opinion,
>
> Tim
>
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