Medical apparatus and instruments for use in computer assisted surgical and therapeutical procedures in the nature of neurosurgical, cranial, fluoroscopic, angiographic, trauma, spinal, orthopedic, radiotherapeutic, ear, nose and throat (ENT), laparoscopic, endoscopic, vascular, visceral, craniomaxillofacial (CMF) procedures and general surgery; medical imaging apparatus; medical X-ray apparatus; medical X-ray imaging apparatus; medical X-ray apparatus for surgical use; medical X-ray apparatu...