In vivo estimates of the position of advanced bionics electrode arrays in the human cochlea

Margaret W. Skinner, Timothy A. Holden, Bruce R. Whiting, Arne H. Voie, Barry Brunsden, J. Gail Neely, Eugene A. Saxon, Timothy Hullar, Charles C. Finley

Research output: Contribution to journalArticle

Abstract

Objectives: A new technique for determining the position of each electrode in the cochlea is described and applied to spiral computed tomography data from 15 patients implanted with Advanced Bionics HiFocus I, Ij, or Helix arrays. Methods: ANALYZE imaging software was used to register 3-dimensional image volumes from patients' preoperative and postoperative scans and from a single body donor whose unimplanted ears were scanned clinically, with micro computed tomography and with orthogonal-plane fluorescence optical sectioning (OPFOS) microscopy. By use of this registration, we compared the atlas of OPFOS images of soft tissue within the body donor's cochlea with the bone and fluid/tissue boundary available in patient scan data to choose the midmodiolar axis position and judge the electrode position in the scala tympani or scala vestibuli, including the distance to the medial and lateral scalar walls. The angular rotation 0° start point is a line joining the midmodiolar axis and the middle of the cochlear canal entry from the vestibule. Results: The group mean array insertion depth was 477° (range, 286° to 655°). The word scores were negatively correlated (r = -0.59; p = .028) with the number of electrodes in the scala vestibuli. Conclusions: Although the individual variability in all measures was large, repeated patterns of suboptimal electrode placement were observed across subjects, underscoring the applicability of this technique.

Original languageEnglish (US)
Pages (from-to)1-24
Number of pages24
JournalAnnals of Otology, Rhinology and Laryngology
Volume116
Issue number4 II
StatePublished - Apr 2007
Externally publishedYes

Fingerprint

Bionics
Cochlea
Electrodes
Scala Vestibuli
Fluorescence
Scala Tympani
Tissue Donors
Atlases
Spiral Computed Tomography
Ear
Microscopy
Software
Tomography
Bone and Bones

Keywords

  • Cochlear implant
  • Electrode array
  • Image volume registration
  • Spiral computed tomography
  • Three-dimensional reconstruction
  • Word recognition

ASJC Scopus subject areas

  • Otorhinolaryngology

Cite this

Skinner, M. W., Holden, T. A., Whiting, B. R., Voie, A. H., Brunsden, B., Neely, J. G., ... Finley, C. C. (2007). In vivo estimates of the position of advanced bionics electrode arrays in the human cochlea. Annals of Otology, Rhinology and Laryngology, 116(4 II), 1-24.

In vivo estimates of the position of advanced bionics electrode arrays in the human cochlea. / Skinner, Margaret W.; Holden, Timothy A.; Whiting, Bruce R.; Voie, Arne H.; Brunsden, Barry; Neely, J. Gail; Saxon, Eugene A.; Hullar, Timothy; Finley, Charles C.

In: Annals of Otology, Rhinology and Laryngology, Vol. 116, No. 4 II, 04.2007, p. 1-24.

Research output: Contribution to journalArticle

Skinner, MW, Holden, TA, Whiting, BR, Voie, AH, Brunsden, B, Neely, JG, Saxon, EA, Hullar, T & Finley, CC 2007, 'In vivo estimates of the position of advanced bionics electrode arrays in the human cochlea', Annals of Otology, Rhinology and Laryngology, vol. 116, no. 4 II, pp. 1-24.
Skinner MW, Holden TA, Whiting BR, Voie AH, Brunsden B, Neely JG et al. In vivo estimates of the position of advanced bionics electrode arrays in the human cochlea. Annals of Otology, Rhinology and Laryngology. 2007 Apr;116(4 II):1-24.
Skinner, Margaret W. ; Holden, Timothy A. ; Whiting, Bruce R. ; Voie, Arne H. ; Brunsden, Barry ; Neely, J. Gail ; Saxon, Eugene A. ; Hullar, Timothy ; Finley, Charles C. / In vivo estimates of the position of advanced bionics electrode arrays in the human cochlea. In: Annals of Otology, Rhinology and Laryngology. 2007 ; Vol. 116, No. 4 II. pp. 1-24.
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