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Validating a New Tablet-based Tool in the Determination of Cochlear Implant Angular Insertion Depth.

Michael W Canfarotta1, Margaret T Dillon, Emily Buss

  • 1Department of Otolaryngology/Head and Neck Surgery, University of North Carolina at Chapel Hill, North Carolina, USA.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
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Summary

This study shows that new tablet software accurately measures cochlear implant insertion depth and length. The software provides reliable results for determining electrode place frequency, aiding in surgical planning.

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Area of Science:

  • Audiology
  • Medical Imaging
  • Neurosurgery

Background:

  • Cochlear implants require precise electrode placement for optimal function.
  • Accurate measurement of electrode insertion depth and cochlear anatomy is crucial for predicting electrode tonotopic location.

Purpose of the Study:

  • To evaluate the reliability of a novel tablet-based software for analyzing postoperative CT scans.
  • To determine the software's accuracy in measuring angular insertion depth (AID) and cochlear duct length (CDL).
  • To assess the software's utility in estimating cochlear place frequency for individual electrodes.

Main Methods:

  • Twenty adult cochlear implant recipients with lateral-wall electrode arrays were analyzed.
  • Two otolaryngologists used tablet software to manually identify cochlear landmarks and electrode contacts.
  • Angular insertion depth (AID) and cochlear duct length (CDL) were calculated and applied to the Greenwood function for place frequency estimation.

Main Results:

  • Excellent intra-rater (0.991) and inter-rater (0.980) reliability were found for AID measurements.
  • Excellent intra-rater (0.820) and inter-rater (0.784) reliability were observed for CDL measurements.
  • The estimated cochlear place frequency for the most apical electrode varied by an average of 6.7% between raters.

Conclusions:

  • The tablet-based software demonstrates excellent reliability for measuring AID and CDL in cochlear implant recipients.
  • This tool facilitates accurate estimation of cochlear place frequency, supporting improved clinical decision-making.
  • The software offers a reliable method for analyzing postoperative imaging in cochlear implant surgery.