At the Cyberknife Institute of Mercy Hospital, we are practicing the most advanced, yet safe, techniques for the treatment of intracranial tumors and vascular lesions. During a CyberKnife treatment, imaging cameras determine the actual location of the lesion. Each time the robotic arm repositions to deliver another fraction of the ablative dose, the CyberKnife computer recalculates the true position of the targeted area. The result is unsurpassed, submillimeter accuracy. This advanced procedure is performed without the need for the stereotactic head frame that is used in other radiosurgical treatments.