The unit of Lead Field matrix

[hyb]

I used brainstorm to compute the Lead Field matrix, now I want to do the forward model for MEG, but I don't know the unit of Lead Field matrix? Are the coordinates of sensor and voxel used to calculate the Lead Field matrix SCS coordinates or MNI coordinates？Thanks!

[Raymundo.Cassani]

@hyb

I don't know the unit of Lead Field matrix?

Check the links in this post:

Unit of Gain Matrix (Lead Field)

Hi all I have read about units of Lead Field matrix generated in Brainstorm, but still i have doubts abouts this. I have generated my lead Fields from Freesurfer surfaces, i got the maximum and the minimum this is 4000 and -2000 approximately, but i don`t know what is the unit. My goal is to know what is the unit of every one of the points in the Gain Matrix grid. Cuz after i want to generate my own J to simulate my eeg from my model. EEG (uv) =Gain Matrix * J Cheers

@hyb

Are the coordinates of sensor and voxel used to calculate the Lead Field matrix SCS coordinates or MNI coordinates？

Yes, both are in SCS

[hyb]

Ok, very thanks!