Thank you very much!, Now I remember, last year I try to solve the forward probem using Openmeeg, with those sensors and I noticed that we have to put the orientation of each electrode, so I orient them toward the uterus mesh, and I get the meg leadfield… I will search in internet to see if I can find the manual of those sensors, so we can know the exact orientation. Otherwise I don’t know what should be a solution, and if correct to put manually the approximately orientation of each sensors.
Best regards
Saeed