Cochlear duct length and cochlear distance on preoperative CT: imaging markers for estimating insertion depth angle of cochlear implant electrode

Objectives Preoperative estimation of the insertion depth angle of cochlear implant (CI) electrodes is essential for surgical planning. The purpose of this study was to determine the cochlear size using preoperative CT and to investigate the correlation between cochlear size and insertion depth angl...

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Bibliographic Details
Published in:European radiology 2021-03, Vol.31 (3), p.1260-1267
Main Authors: Oh, Jiseon, Cheon, Jung-Eun, Park, Junghoan, Choi, Young Hun, Cho, Yeon Jin, Lee, Seunghyun, Oh, Seung Ha, Shin, Su-Mi, Park, Sun-Won
Format: Article
Language:English
Subjects:
Child
Cochlea
Cochlea - diagnostic imaging
Cochlear Duct - surgery
Cochlear Implantation
Cochlear Implants
Computed tomography
Correlation analysis
Correlation coefficient
Correlation coefficients
Depth perception
Diagnostic Radiology
Diameters
Electrodes
Estimation
Head and Neck
Humans
Imaging
Insertion
Internal Medicine
Interventional Radiology
Markers
Medicine
Medicine & Public Health
Neuroradiology
Radiographs
Radiography
Radiology
Statistical analysis
Surgery
Tomography, X-Ray Computed
Ultrasound
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Summary:Objectives Preoperative estimation of the insertion depth angle of cochlear implant (CI) electrodes is essential for surgical planning. The purpose of this study was to determine the cochlear size using preoperative CT and to investigate the correlation between cochlear size and insertion depth angle in morphologically normal cochlea. Methods Thirty-five children who underwent CI were included in this study. Cochlear duct length (CDL) and the diameter of the cochlear basal turn (distance A/B) on preoperative CT and the insertion depth angle of the CI electrode on postoperative radiographs were independently measured by two readers. Correlation between cochlear size and insertion depth angle was evaluated. Interobserver agreement was calculated using the intraclass correlation coefficient (ICC). Results The mean CDL, distance A, and distance B of 70 ears were 36.20 ± 1.57 mm, 8.67 ± 0.42 mm, and 5.73 ± 0.32 mm, respectively. The mean insertion depth angle was 431.45 ± 38.42°. Interobserver agreements of CDL, distance A/B, and insertion depth angle were fair to excellent (ICC 0.864, 0.862, 0.529, and 0.958, respectively). Distance A ( r = − 0.7643) and distance B ( r = − 0.7118) showed a negative correlation with insertion depth angle, respectively ( p < 0.0001). However, the correlation between CDL and insertion depth angle was not statistically significant ( r = − 0.2333, p > 0.05). Conclusions The CDL and cochlear distance can be reliably obtained from preoperative CT. Distance A can be used as a predictive marker for estimating insertion depth angle during CI surgery.
ISSN:0938-7994
1432-1084
DOI:10.1007/s00330-020-07580-4