Nice try. But I wrote stents. Small metallic mesh tubes inserted into coronary and other arteries to keep them patent. And stents are a contraindication for MRI for a period of six-twelve months. My point being that though Terri could not have had the MRI in the past, it would be feasible today, and would define the damage done to her brain. A PET scan would have given more information than did the CT scans which were done.
Have you actually asked a doctor if someone with electrodes can have an MRI? Try it.