In-Vitro microct validation of preoperative cochlear duct length estimation

W. Wimmer, N. Gerber, A. Dhanasingh, P. Mistrik, C. Jolly, B. Bell, S. Weber, M. Kompis, M. Caversaccio

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Variation in human cochlear dimension must be considered when selecting a patient-suitable electrode array for cochlear implantation. A promising way of cochlear duct length (CDL) prediction utilizes statistical properties of variations in cochlear morphology. In this work, CDL values estimated by statistically derived equations were validated using three-dimensional measurements in micro-CT data sets of seven human temporal bones with implanted electrode arrays. Further, the lateral wall length (LWL) was assessed manually and compared to the prediction of Escudé's equation. Comparison showed good congruency of the measured and predicted CDL and LWL at one turn length (basal turn). Deviations of about 5 % were observed in CDL at 1.5 turn lengths, as well in LWL at 1.5 and 2 turn lengths. Results suggest that CDL prediction based on a single radiographic measurement of the cochlea could support surgeons in electrode array selection, but further investigation with increased sample size is necessary.

Original languageEnglish
Pages (from-to)143-146
Number of pages4
JournalCEUR Workshop Proceedings
StatePublished - 2013
Externally publishedYes
EventAnnual Meeting of CURAC (Computer-und Roboterassistierte Chirurgie), CURAC 2013 - Innsbruck, Austria
Duration: 28 Nov 201330 Nov 2013


  • Cochlear implantation
  • Escudé's equation
  • Insertion depth


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