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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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Accuracy of Preoperative Cochlear Duct Length Estimation and Angular Insertion Depth Prediction.

Tabita Breitsprecher1, Robert Mlynski2, Christiane Völter1

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Ruhr-University Bochum, St. Elisabeth-Hospital Bochum, Bochum, Germany.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|August 8, 2023
PubMed
Summary

Preoperative cochlear implant (CI) insertion depth models overestimate the actual angle, potentially leading to suboptimal electrode choices. A 5% correction factor is recommended for accurate surgical planning.

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Medical Imaging

Background:

  • Optimal cochlear coverage (70-80%) in cochlear implantation (CI) is crucial for speech perception.
  • Accurate fitting of CI to individual anatomy is increasingly important.
  • Preoperative planning of angular insertion depth (AID) is essential for successful CI surgery.

Purpose of the Study:

  • To investigate the agreement between preoperatively estimated and postoperatively measured AID in cochlear implantation.
  • To evaluate the accuracy of a manufacturer's software for visualizing AID.
  • To determine if preoperative AID models overestimate postoperative measurements.

Main Methods:

  • Retrospective cross-sectional study at a single tertiary referral center.
  • Analysis of 80 high-resolution computed tomography (HRCT) datasets from 69 patients undergoing CI.
  • Comparison of preoperatively estimated AID using software with postoperatively measured AID from HRCT.

Main Results:

  • Preoperative AID estimation significantly overestimated the postoperative insertion angle in all cases (100%).
  • The mean difference was 38.1°, with preoperative estimation at 662.0° (SD, 61.5°) versus postoperative measurement at 583.9° (SD, 73.6°).
  • A correction factor of 0.95 (5% reduction) on preoperative AID estimation resolved the observed differences.

Conclusions:

  • Preoperative AID models may overestimate the insertion angle, potentially influencing electrode array selection.
  • Applying a correction factor of 0.95 to preoperative AID estimations is recommended for improved surgical planning.
  • Accurate AID assessment is vital for optimizing cochlear implant fitting and speech perception outcomes.