gms | German Medical Science


Figure 1: Distance (antero-/posterior (ap) and superior/inferior (si) extend at the anterior (ant) and posterior (post) border of the sphenoid sinus) between landmarks tracked in both neuronavigation and fluoroscopy in the sphenoid sinus. ED means the euclidic distance between the ap- and si-extend and represents the total geometric deviation between both methods in a 2-dimensional space.