Nicolo Cardobi, Presenter: Nothing to Disclose

Roberto Cerini, Abstract Co-Author: Nothing to Disclose

Federica Spagnolli, Abstract Co-Author: Nothing to Disclose

Marco Barillari MD, Abstract Co-Author: Nothing to Disclose

Marco Carner, Abstract Co-Author: Nothing to Disclose

Vittorio Colletti MD, Abstract Co-Author: Nothing to Disclose

the main goal of our study was to evaluate the contribution of the Computed Tomography to demonstrate Auditory Brainstem Implant (ABI) electrodes dislocation.

from 2008, out of 75 patient with ABI implant positioned in our Hospital, 7 patients with malfunctioning ABI were selected and retrospectively revised. CT examination was performed on our 64 slices CT scanner (Philips Brilliance 64, Philips Eindhoven, The Netherlands) at implant activation, usually 15 days after surgery and repeated later to verify any electrodes dislocations. Implant dislocation was defined as electrodes array rotation and/or translation. Rotation was defined as change in angulation, measured in degrees, of electrodes plate in each plane examined, between the CT examination performed at the ABI activation and subsequent follow-up CT. Translation was defined as displacement in millimetres of electrodes plate’s iso-center, in each plane examined, between the CT examination performed at the ABI activation and subsequent follow-up CT. Electrodes translation and rotation were measured on fusion CT image in each plane and then compared to number of active electrodes of the array.

CT was able to identify electrodes plate rotation and/or dislocation in all patients. In 3/7 patients there were electrodes plate rotation and translation. In 2/7 patients there was only electrodes plate translation. Maximum rotation measured was 44.9°; maximum dislocation was 3.6 mm.

CT was able to identify electrodes plate rotation and/or dislocation in all patients.

computer tomography is a useful tool to detect ABI dislocation and should be used in case of decrease ABI performance over time

Cardobi, N, Cerini, R, Spagnolli, F, Barillari, M, Carner, M, Colletti, V, Auditory Brainstem Implant: Computer Tomography Assessment of Electrodes Dislocation.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14014906.html