CT imaging-based approaches to cochlear duct length estimation-a human temporal bone study.
Acoustic stimulation
Cochlea
Electrodes, implanted
Imaging, three-dimensional
Journal
European radiology
ISSN: 1432-1084
Titre abrégé: Eur Radiol
Pays: Germany
ID NLM: 9114774
Informations de publication
Date de publication:
Feb 2022
Feb 2022
Historique:
received:
11
03
2021
accepted:
30
06
2021
revised:
18
06
2021
pubmed:
1
9
2021
medline:
1
2
2022
entrez:
31
8
2021
Statut:
ppublish
Résumé
Knowledge about cochlear duct length (CDL) may assist electrode choice in cochlear implantation (CI). However, no gold standard for clinical applicable estimation of CDL exists. The aim of this study is (1) to determine the most reliable radiological imaging method and imaging processing software for measuring CDL from clinical routine imaging and (2) to accurately predict the insertion depth of the CI electrode. Twenty human temporal bones were examined using different sectional imaging techniques (high-resolution computed tomography [HRCT] and cone beam computed tomography [CBCT]). CDL was measured using three methods: length estimation using (1) a dedicated preclinical 3D reconstruction software, (2) the established A-value method, and (3) a clinically approved otosurgical planning software. Temporal bones were implanted with a 31.5-mm CI electrode and measurements were compared to a reference based on the CI electrode insertion angle measured by radiographs in Stenvers projection (CDL A mean cochlear coverage of 74% (SD 7.4%) was found. The CDL All approaches would have led to an electrode choice of rather too short electrodes. Concerning treatment decisions based on CDL measurements, the otosurgical planning software-based method has to be recommended. The best inter-rater reliability was found for CDL • Clinically applicable calculations using high-resolution CT and cone beam CT underestimate the cochlear size. • Ten percent of cochlear duct length need to be added to current calculations in order to predict the postoperative CI electrode position. • The clinically approved otosurgical planning software-based method software is the most suitable to estimate the cochlear duct length and shows an excellent inter-rater reliability.
Identifiants
pubmed: 34463797
doi: 10.1007/s00330-021-08189-x
pii: 10.1007/s00330-021-08189-x
pmc: PMC8794899
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1014-1023Informations de copyright
© 2021. The Author(s).
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