Related references:
R. Jech, D. Urgosik, J. Tintera, A. Nebuzelsky, J. Krasensky, R. Liscak, J. Roth, E. Ruzicka
Functional magnetic resonance imaging during deep brain stimulation: A pilot study in four patients with Parkinson's disease.Movement Disorders 16(2001): 1126-1132.