Has anyone here had a MEG (Magnetoencephalography) or SPECT (?) scan?

Rachel had her followup appointment on Friday. The neurologist thinks that our best bet for getting any seizure control is to remove the heterotopia that is in her left frontal lobe. Of course, first they have to trace the seizures to that spot, and as of now the EEG's have not captured anything. He thinks that the seizures are orginating deep in the brain and that the MEG should be able to capture them.