A patient with Parkinson's disease is treated with thalamic stimulation : electrods are inserted into the brain and fed with a thalamic pacemaker implanted in the thorax. This neurosurgery is performed with the O-ARM Imaging System. This motorized intra-operative multi-dimensional surgical imaging platform provides real-time high resolution fluoroscopy and 3D CT scan imaging, and allows high precision and safety surgical procedures. Here, the implantation of the electrods is 3D simulated and the