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Reliability of cone beam computed tomography in scalar localization of the electrode array: a radio histological study

  • Otology
  • Published:
European Archives of Oto-Rhino-Laryngology Aims and scope Submit manuscript

Abstract

Postoperative imaging plays a growing role in clinical studies concerning prognostic factors in cochlear implantation. Indeed, intracochlear position of the cochlear implant has recently been identified as a contributor in functional outcomes and radiological tools must be accurate enough to determine the final placement of the electrode array. The aim of our study was to validate cone beam computed tomography as a reliable technique for scalar localization of the electrode array. We performed therefore a temporal bone study on ten specimens that were implanted with a perimodiolar implant prototype. Cone beam reconstructions were performed and images were analyzed by two physicians both experienced in cochlear implant imaging, who determined the scalar localization of the implant. Temporal bones then underwent histological control to document this scalar localization and hypothetical intracochlear lesions. In four cases, a dislocation from scala tympani to scala vestibuli was suspected on cone beam reconstructions of the ascending part of the basal turn. In three of these four specimens, dislocation in pars ascendens was confirmed histologically. In the remaining temporal bone, histological analysis revealed an elevation with rupture of the basilar membrane. Histological assessment revealed spiral ligament tearing in another bone. We conclude that cone beam is a reliable tool to assess scalar localization of the selectrode array and may be used in future clinical studies.

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Conflict of interest

The implant prototypes were provided by Cochlear Limited. Histological evaluation was performed by Cochlear Limited.

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Authors and Affiliations

  1. Department of Otology-Neurotology and Skull Base Surgery, Purpan University Hospital, Place du Docteur Baylac, 31059, Toulouse, France

    Mathieu Marx, Bernard Escudé, Christopher James, Olivier Deguine & Bernard Fraysse

  2. CerCo, UMR 5549, CNRS-Université Paul Sabatier, Toulouse, France

    Mathieu Marx & Olivier Deguine

  3. Cochlear Limited, Sydney, Australia

    Frank Risi, Irfan Durmo & Christopher James

  4. Department of Neuroradiology, Clinique Pasteur, Toulouse, France

    Bernard Escudé

  5. Department of Maxillo Facial Surgery, Purpan University Hospital, Toulouse, France

    Frédéric Lauwers

Authors
  1. Mathieu Marx
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  2. Frank Risi
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  3. Bernard Escudé
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  4. Irfan Durmo
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  5. Christopher James
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  6. Frédéric Lauwers
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  7. Olivier Deguine
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  8. Bernard Fraysse
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Correspondence to Mathieu Marx.

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Marx, M., Risi, F., Escudé, B. et al. Reliability of cone beam computed tomography in scalar localization of the electrode array: a radio histological study. Eur Arch Otorhinolaryngol 271, 673–679 (2014). https://doi.org/10.1007/s00405-013-2448-6

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  • DOI: https://doi.org/10.1007/s00405-013-2448-6

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