[Georg Schlöndorff-the father of computer-assisted surgery].

Georg Schlöndorff (1931-2011) developed the idea of computer-assisted surgery (CAS) during his time as professor and chairman of the Department of Otorhinolaryngology at the Medical Faculty of the University of Aachen, Germany. In close cooperation with engineers and physicists, he succeeded in translating this concept into a functional prototype that was applied in live surgery in the operating theatre. The first intervention performed with this image-guided navigation system was a skull base surgical procedure 1987. During the following years, this concept was extended to orbital surgery, neurosurgery, mid-facial traumatology, and brachytherapy of solid tumors in the head and neck region. Further technical developments of this first prototype included touchless optical positioning and the computer vision concept with three orthogonal images, which is still common in contemporary navigation systems. During his time as emeritus professor from 1996, Georg Schlöndorff further pursued his concept of CAS by developing technical innovations such as computational fluid dynamics (CFD).