In all accounts I have read of pallidotomy, the pallidotomy is preceded by an MRI in order to locate the particular site(s) requiring surgical treatment. I have been wondering if there is some other imaging technique which could do the job other than MRI. My mother has PD and is doing well at the moment with medication but she has a metal plate in her head making MRI impossible. I have been wondering if this would rule her out as a future pallidotomy recipient. --A. Cavin