Auditory performance of post-lingually deafened adult cochlear implant recipients using electrode deactivation based on postoperative cone beam CT images

Abstract

Purpose

The use of image processing techniques to estimate the position of intra-cochlear electrodes has enabled the creation of personalized maps to meet the individual stimulation needs of cochlear implant (CI) recipients. The aim of this study was to evaluate a novel technique of electrode deactivation based on postoperative cone beam computed tomography (CBCT) images in post-lingually deafened adult CI recipients.

Methods

Based on postoperative CBCT images, the positioning of the electrodes was estimated in relation to the modiolus in 14 ears of 13 post-lingually deafened adult CI recipients. The electrodes sub-optimally positioned or involved in kinking and tip fold-over were deactivated. Speech perception scores in silence and in noise were obtained from subjects using the standard map and were followed up 4 weeks after image-based electrode deactivation reprogramming technique (IBEDRT). The participants selected their preferred map after 4 weeks of IBEDRT use.

Results

There were statistically significant improvements in the speech recognition tests in silence and noise when comparing IBEDRT performance to the standard map. All participants elected the IBEDRT as their new preferred map.

Conclusions

IBEDRT is a promising technique for fitting CI recipients and minimizing channel interaction increased by the positioning of the electrodes sub-optimally placed, thereby improving their auditory performance. We propose a novel electrode deactivation technique based on postoperative CBCT imaging, with a limited number of deactivated electrodes and a low-dosing scanning which could be applied for clinical routine.

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Acknowledgements

The authors would like to thank Dr Michel Hoen for helpful comments on an earlier version of the manuscript

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All authors contributed to the study. FD designed and performed the study. TD reviewed the data and performed the analysis of the manuscript. MSAA helped in the data collection and reviewed the manuscript. ACMBR wrote parts of the manuscript. DG reviewed the data and supported the design of the study. MAH designed and wrote parts of the manuscript. All authors reviewed and approved the manuscript.

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Correspondence to Fabiana Danieli.

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Danieli, F., Dermacy, T., do Amaral, M.S.A. et al. Auditory performance of post-lingually deafened adult cochlear implant recipients using electrode deactivation based on postoperative cone beam CT images. Eur Arch Otorhinolaryngol (2020). https://doi.org/10.1007/s00405-020-06156-8

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Keywords

  • Cochlear implants
  • Image guidance
  • Auditory nerve
  • Stimulation strategy
  • Speech perception