[Computed tomography in the evaluation of cochlear structural features in cochlear implantation]

Temporal bone computed tomographic scans were studied in 136 deaf patients of different age and sex, including 56 patients (39 children and 17 adults) rehabilitated with cochlear implantation (CI). The mean values of the cochlear parameters that are important for the results of a surgical CI stage, namely: the diameter of the cochlear base (DCB), the diameter of the basal helix, the height of the cochlea, the angle between the cochlear base and the promontorial wall, were calculated. These parameters were compared in different age groups. A correlation was determined for each of the studied parameters and for the depth of intracochlear insertion of electrodes. There was a significant correlation between DCB and the depth of insertion of the electrodes of CI22M and CI24M cochlear implants. DBC at which the active part of the electrode chain of an implant could be significantly more frequently placed in the tympanic scala of the cochlea was estimated.