Hi MNE users,
I have used the mne_volume_source_space command to get a source space of 6
dipoles. After getting my estimates I get a total of 18 sources
orientations. I would like to know which sources correspond to what
dipoles.
If I have 18 sources, are they arrange so that the first 3 elements are
for the first dipole, the second third for the second dipole and so on?
I think it is so but I want to confirm it.
Thank you very much for your comments and suggestions.
Hi Andr?s,
Hi MNE users,
I have used the mne_volume_source_space command to get a source
space of 6
dipoles. After getting my estimates I get a total of 18 sources
orientations. I would like to know which sources correspond to what
dipoles.If I have 18 sources, are they arrange so that the first 3 elements
are
for the first dipole, the second third for the second dipole and so
on?I think it is so but I want to confirm it.
Thank you very much for your comments and suggestions.
The data are arranged exactly as you describe. The forward matrix A =
(a_1 a_2 a_3 .... a_3N) where N is the number of sources and column
a_1 is the the field of the dipole oriented in the x direction at
location 1, a_2 is the field of the dipole oriented in the y direction
at location 1, a_3 is the field of the dipole oriented in the z
direction etc.
If the --mricoord option was specified when the forward solution was
computed, the x, y, and z axes are those of the MRI (RAS) coordinate
system. In the absense of this option, the orientations are defined by
the MEG head coordinate system.
I hope this helps
- Matti