[FieldTrip] LCMV beamformer

[deadala at freenet.de]

Dear all
 
I am currently using the LCMV beamformer (beamformer_lcmv.m) with my own data.
 
Your function:
beamformer_lcmv(dip, grad, vol, dat, Cy, varargin)
 
My input:
 
dip  - structure array, with fields:   - pos            Nx3 array (N- sources)
                                                  - inside         1xN array
                                                  - outside       empty (all sources inside)
                                                  - leadfield     1xN cell array with 1xM arrays (M- channels)
 
grad  - empty  -> because I am using my own leadfield
vol  -  empty  -> because I am using my own leadfield
dat  - MxS array (S- samples)
Cy  -  MxM array
 
The problem:
 
I want to check my own implementation of LCMV beamformer against MNE (software) an your LCMV beamformer with similar data
( measurement, leadfield, data covariance).
The MNE and my own beamformer show the same activity of sources. But your LCMV beamformer calculates activities on other places in the brain.
 
My question:
What I am doing wrong?
Are the input arguments false or the numbers of sources change?
 
Thanks in advance for the help.
Diana
 


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