Verification of computed tomographic estimates of cochlear implant array position

A micro-CT and histologic analysis

Jessica Teymouri, Timothy Hullar, Timothy A. Holden, Richard A. Chole

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Objective: To determine the efficacy of clinical computed tomographic (CT) imaging to verify postoperative electrode array placement in cochlear implant (CI) patients. Study Design: Nine fresh cadaver heads underwent clinical CT scanning, followed by bilateral CI insertion and postoperative clinical CT scanning. Temporal bones were removed, trimmed, and scanned using micro-CT. Specimens were then dehydrated, embedded in either methyl methacrylate or LR White resin, and sectioned with a diamond wafering saw. Histology sections were examined by 3 blinded observers to determine the position of individual electrodes relative to soft tissue structures within the cochlea. Electrodes were judged to be within the scala tympani, scala vestibuli, or in an intermediate position between scalae. Results: The position of the array could be estimated accurately from clinical CT scans in all specimens using micro-CT and histology as a criterion standard. Verification using micro-CT yielded 97% agreement, and histologic analysis revealed 95% agreement with clinical CT results. Conclusion: A composite, 3-dimensional image derived from a patient's preoperative and postoperative CT images using a clinical scanner accurately estimates the position of the electrode array as determined by micro-CT imaging and histologic analyses. Information obtained using the CT method provides valuable insight into numerous variables of interest to patient performance such as surgical technique, array design, and processor programming and troubleshooting.

Original languageEnglish (US)
Pages (from-to)980-986
Number of pages7
JournalOtology and Neurotology
Volume32
Issue number6
DOIs
StatePublished - Aug 2011
Externally publishedYes

Fingerprint

Cochlear Implants
Electrodes
Histology
Scala Vestibuli
Scala Tympani
Diamond
Methacrylates
Temporal Bone
Cochlea
Cadaver
Head

Keywords

  • Array position
  • Cochlear implant
  • Computed tomographic scan
  • Histology

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Clinical Neurology
  • Sensory Systems
  • Medicine(all)

Cite this

Verification of computed tomographic estimates of cochlear implant array position : A micro-CT and histologic analysis. / Teymouri, Jessica; Hullar, Timothy; Holden, Timothy A.; Chole, Richard A.

In: Otology and Neurotology, Vol. 32, No. 6, 08.2011, p. 980-986.

Research output: Contribution to journalArticle

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