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PT  - JOURNAL ARTICLE
AU  - Eser, M.B.
AU  - Atalay, B.
AU  - Dogan, M.B.
AU  - Gündüz, N.
AU  - Kalcioglu, M.T.
TI  - Measuring 3D Cochlear Duct Length on MRI: Is It Accurate and Reliable?
AID  - 10.3174/ajnr.A7287
DP  - 2021 Sep 30
TA  - American Journal of Neuroradiology
4099  - http://www.ajnr.org/content/early/2021/09/30/ajnr.A7287.short
4100  - http://www.ajnr.org/content/early/2021/09/30/ajnr.A7287.full
AB  - BACKGROUND AND PURPOSE: Prior studies have evaluated cochlear length using CT to select the most suitable cochlear implants and obtain patient-specific anatomy. This study aimed to test the accuracy and reliability of cochlear lateral wall length measurements using 3D MR imaging.MATERIALS AND METHODS: Two observers measured the cochlear lateral wall length of 35 patients (21 men) with postlingual hearing loss using CT and MR imaging. The intraclass correlation coefficient (with 95% confidence intervals) was used to evaluate intraobserver and interobserver reliability for the 3D cochlear measurements.RESULTS: The mean age of the participants was 39.85 (SD, 16.60) years. Observer 1 measured the mean lateral wall length as 41.52 (SD, 2.25) mm on CT and 41.44 (SD, 2.18) mm on MR imaging, with a mean difference of 0.08 mm (95% CI, −0.11 to 0.27 mm), while observer 2 measured the mean lateral wall length as 41.74 (SD, 2.69) mm on CT and 42.34 (SD, 2.53) mm on MR imaging, with a mean difference of −0.59 mm (95% CI, −1.00 to −0.20 mm). An intraclass correlation coefficient value of 0.90 (95% CI, 0.84−0.94) for CT and 0.69 (95% CI, 0.46−0.82) for MR imaging was obtained for the interobserver reliability for the full-turn cochlear lateral wall length.CONCLUSIONS: CT-based 3D cochlear measurements show excellent intraobserver and interobserver reliability, while MR imaging−based lateral wall length measurements have good-to-excellent intraobserver reliability and moderate interobserver reliability. These results corroborate the use of CT for 3D cochlear measurements as a reference method and demonstrate MR imaging to be an alternative acquisition technique with comparably reliable results.ICCintraclass correlation coefficientLWLlateral wall length