A method for creating frameless stereotactic frame in deep brain stimulation

Deep brain stimulation (DBS) electrode placement has been a well-established technique in treating Parkinson´s disease and epilepsy. The traditional frame-based stereotaxis needs a set of complicated instruments and brings lots of inconvenience to the patient during the surgery. This paper presents a frameless stereotactic system and shows how the system works. Then we describe the method used in the system for creating the frameless stereotactic frame. The stereotactic frame is created after 3 or 4 screw based reference points and one target point are assigned on the patient´s CT and MR atlas. The algorithm to generate the frame is given in the paper. We show three instances to validate the developed method.