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A methodology designed to increase accuracy and safety in stereotactic brain surgery.

A series of technical tips and devices designed to increase accuracy and safety in stereotactic surgery are presented. We use stereotactic magnetic resonance imaging with three-dimensional magnetization-prepared rapid gradient-echo (MP-RAGE) imaging to minimize image distortion, and a three-dimensional stereotactic planning system for accurately registering three-dimensional space. We also developed several technical devices useful for stereotactic intracranial procedures; an applicator system attached to the frame which simulates the fiducial markers in order to keep the target at a suitable position in stereotactic space; a torque wrench to set the torque on the fixing pins to the frame reproducibly at 5 inch pounds in order to keep distortion of the frame to a minimum while maintaining secure fixation; an entry point marker to maintain the calculated trajectory angle; a straightening cannula to prevent the thermo-coagulation needle from bending; a microvascular Doppler and its holder to detect significant vessels and to know their precise depth in order to avoid vascular injury from thermocoagulation; a burr hole button device to secure depth electrode cables at the patient's skull.

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