The relation between Scouts and brain grid

Dear Steven,
So I must multiple lead field matrix array with order 1e-6?

and about using conv, I have a communication background so I think that because we have the environment transition model (lead field matrix) and the source signal, we must use conv for obtaining measurement. now, if I want to use multiplication, the dimension of leadfeild array and source signal are not match for multiplication operating. How can I do it?

thank you for your answers
best wishes
Morteza