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Related Experiment Video

Updated: Feb 18, 2026

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Evaluation of Cochlear Implant Receiver Position and Its Temporal Changes.

Gloria Grupe1, Grit Rademacher, Solvig Hofmann

  • 1*Department of Otolaryngology, Head and Neck Surgery †Department of Radiology, Unfallkrankenhaus Berlin, Berlin, Germany.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|November 15, 2017
PubMed
Summary

Cochlear implant (CI) receiver positioning changed significantly over time, with angles increasing and distances decreasing. This evolution impacts magnetic resonance imaging (MRI) artifact visibility for cochlear and auditory canal imaging.

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Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Otolaryngology

Background:

  • Increasing cochlear implant (CI) patients necessitate more frequent magnetic resonance imaging (MRI).
  • CI devices cause MRI artifacts, limiting visualization of intracranial structures.
  • CI receiver position significantly influences MRI artifact severity and visibility.

Purpose of the Study:

  • To establish normative data on cochlear implant (CI) receiver positioning changes over time.
  • To analyze trends in CI receiver placement by a single surgeon.
  • To correlate CI receiver position with MRI artifact visibility.

Main Methods:

  • Retrospective analysis of topograms from 150 CI recipients (2008-2015).
  • Measurement of nasion-external auditory canal-internal magnet angle and internal magnet-external auditory canal distance.
  • Evaluation of temporal changes in these positioning parameters.

Main Results:

  • The most common CI receiver position was an angle of 121-140 degrees (mean 127) and distance of 61-80 µm (mean 70).
  • Statistically significant increases in the angle and decreases in the distance were observed over time.
  • No significant differences in positioning were found between CI manufacturers.

Conclusions:

  • CI receiver position is critical for artifact-free imaging of the cochlea and internal auditory canal.
  • Understanding temporal changes in CI receiver position aids in managing artifact-related visibility limitations during MRI.
  • Awareness of positioning trends can optimize MRI protocols for CI patients.