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Flat-Panel CT Imaging for Individualized Pitch Mapping in Cochlear Implant Users.

Nicole T Jiam1, Monica S Pearl, Courtney Carver

  • 1*Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland†Division of Interventional Neuroradiology, Johns Hopkins University School of Medicine, Baltimore, Maryland‡Interventional Neuroradiology, Children's National Medical Center, Washington, DC§Department of Otolaryngology-Head and Neck Surgery, University of California San Francisco School of Medicine, San Francisco, California.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|June 9, 2016
PubMed
Summary

Cochlear implant electrode placement often deviates from ideal frequency mapping, impacting hearing. Flat-panel CT imaging can identify these discrepancies, potentially improving cochlear implant (CI) programming for better sound perception.

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Area of Science:

  • Otoacoustic Emissions
  • Auditory Neuroscience
  • Medical Imaging

Background:

  • Cochlear implant (CI) technology aims to restore hearing by electrically stimulating the auditory nerve.
  • Accurate frequency-place mapping is crucial for effective CI function, but anatomical variations can lead to discrepancies.
  • Current methods for assessing electrode position and its relation to tonotopic organization are often indirect or lack precision.

Purpose of the Study:

  • To identify the precise location of electrode contacts within the cochlea using advanced imaging techniques.
  • To quantify the frequency deviation between predicted and actual electrode positions in cochlear implant users.
  • To establish a method for assessing frequency-place mismatch in individual CI patients.

Main Methods:

  • Retrospective analysis of 17 cochlear implant users' data.
  • Acquisition of flat-panel computed tomography (FPCT) scans for detailed cochlear imaging.
  • Measurement of electrode contact distances from the cochlear base using 3D reconstructions and a modified Greenwood's function.
  • Comparison of calculated characteristic frequencies with programmed frequency allocation maps.

Main Results:

  • Reprogramming based on FPCT findings could potentially improve 83% of analyzed electrode contacts.
  • Significant deviations were observed in basal and apical electrodes, with consistent undershooting and overshooting, respectively.
  • Frequency mismatch ranged from 0.41 to 1.51 octave bands, highlighting a discrepancy between neural tonotopy and CI programming.

Conclusions:

  • FPCT imaging and modified Greenwood's function reveal a quantifiable discrepancy between theoretical and actual CI electrode placement concerning frequency-place mapping.
  • This study demonstrates a reproducible method for assessing individual frequency-place mismatch, accounting for anatomical variability.
  • Future prospective trials are necessary to evaluate the impact of personalized pitch mapping on speech and pitch perception in CI users.