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Related Experiment Video

Updated: Nov 1, 2025

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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Impact of Cochlear Implant Array Placement on Speech Perception.

Francesco Lo Russo1, Giorgio Conte2, Federica Di Berardino3

  • 1Department of Neuroradiology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, via Francesco Sforza, 28, 20122, Milan, Italy. francesco.maria.lorusso@gmail.com.

Clinical Neuroradiology
|June 18, 2021
PubMed
Summary

Flat panel computed tomography (FPCT) helps evaluate cochlear implant (CI) electrode position. Surgical insertion depth (SID) measured by FPCT predicts speech perception outcomes, along with patient age and electrode count.

Keywords:
Angular insertion depthFlat panel CTLinear insertion depthSensorineural hearing lossSurgical insertion depthWrapping factor

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Area of Science:

  • Otolaryngology
  • Medical Imaging
  • Neurosurgery

Background:

  • Cochlear implantation (CI) is a vital treatment for severe to profound hearing loss.
  • Accurate electrode placement is crucial for optimal CI device performance and speech perception.
  • Flat panel computed tomography (FPCT) offers advanced imaging for detailed anatomical assessment.

Purpose of the Study:

  • To evaluate the utility of FPCT in assessing cochlear implant (CI) electrode positioning.
  • To determine the relationship between CI electrode position and post-operative speech perception outcomes.

Main Methods:

  • Retrospective analysis of 50 adult deaf subjects who underwent unilateral CI and FPCT imaging.
  • Speech perception was assessed using disyllabic word scores pre- and 6-months post-implantation.
  • Key electrode positioning variables including surgical insertion depth (SID) were analyzed and correlated with speech perception changes (ΔSDS).

Main Results:

  • Subjects with favorable speech perception outcomes had significantly higher surgical insertion depths (SID).
  • Earlier age at implantation was also associated with better speech perception outcomes.
  • A predictive model incorporating age at CI, electrode count, and SID accurately classified 76% of outcomes.

Conclusions:

  • Surgical insertion depth (SID) measured via FPCT is a significant predictor of speech perception outcomes following cochlear implantation.
  • Age at implantation and the number of CI electrodes also contribute to predicting speech perception success.
  • FPCT provides valuable insights into electrode positioning for optimizing CI results.