Semiautomatic Cochleostomy Target and Insertion Trajectory Planning for Minimally Invasive Cochlear Implantation
Figure 4
Intervention planning for minimally invasive CI surgery in a dedicated software tool [21]. Visualization of the segmented posterior wall of the external auditory canal (EAC), the facial nerve (FN), the chorda tympani (ChT), the ossicles (OS), and the bony labyrinth (L). The planned trajectory (Tr) and the ideal trajectory as computed by the algorithm (broken-dotted line) are shown. (a) Planning situation from an inferior view; the angle describes the offset between the planned trajectory and the ideal trajectory with respect to the basal turn of the cochlea for a given cochleostomy target. Note that the ideal trajectory is running through the facial nerve. (b) The same plan as seen from an anterior view; the offset between the planned and the computed ideal trajectory in the basal turn plane is described by the angle .
