Fully Automated Measurement of Cochlear Duct Length From Clinical Temporal Bone Computed Tomography

2021 ◽  
Author(s):  
Caio A. Neves ◽  
Emma D. Tran ◽  
Shayna P. Cooperman ◽  
Nikolas H. Blevins
Keyword(s):  
Computed Tomography ◽  
Temporal Bone ◽  
Automated Measurement ◽  
Cochlear Duct ◽  
Cochlear Duct Length

A study on modelling cochlear duct mid-scalar length based on high-resolution computed tomography, and its effect on peri-modiolar and mid-scalar implant selection

2019 ◽  
Vol 133 (09) ◽  
pp. 764-769
Author(s):  
G Pamuk ◽  
A E Pamuk ◽  
A Akgöz ◽  
E Öztürk ◽  
M D Bajin ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Round Window ◽  
Chronic Otitis Media ◽  
Lateral Wall ◽  
High Resolution Computed Tomography ◽  
Cochlear Duct ◽  
Implant Selection ◽  
Cochlear Duct Length ◽  
Implant Length

AbstractObjectiveTo determine cochlear duct mid-scalar length in normal cochleae and its role in selecting the correct peri-modiolar and mid-scalar implant length.MethodsThe study included 40 patients with chronic otitis media who underwent high-resolution computed tomography of the temporal bone. The length and height of the basal turn, mid-modiolar height of the cochlea, mid-scalar and lateral wall length of the cochlear duct, and the ‘X’ line (the largest distance from mid-point of the round window to the mid-scalar point of the cochlear canal) were measured.ResultsCochlear duct lateral wall length (28.88 mm) was higher than cochlear duct mid-scalar length (20.08 mm) (p < 0.001). The simple linear regression equation for estimating complete cochlear duct length was: cochlear duct length = 0.2 + 2.85 × X line.ConclusionUsing the mid-scalar point as the reference point (rather than the lateral wall) for measuring cochlear duct mid-scalar length, when deciding on the length of mid-scalar or peri-modiolar electrode, increases measurement accuracy. Mean cochlear duct mid-scalar length was compatible with peri-modiolar and mid-scalar implant lengths. The measurement method described herein may be useful for pre-operative peri-modiolar or mid-scalar implant selection.

Computed Tomography Estimation of Cochlear Duct Length Can Predict Full Insertion in Cochlear Implantation

2016 ◽  
Vol 37 (3) ◽  
pp. 223-228 ◽  
Author(s):  
James D. A. Johnston ◽  
Daniel Scoffings ◽  
Mark Chung ◽  
David Baguley ◽  
Neil P. Donnelly ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cochlear Implantation ◽  
Cochlear Duct ◽  
Cochlear Duct Length

scholarly journals Cochlear Duct Length Measurements in Computed Tomography and Magnetic Resonance Imaging Using Newly Developed Techniques

OTO Open ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 2473974X2110453
Author(s):  
Johannes Taeger ◽  
Franz Tassilo Müller-Graff ◽  
Lukas Ilgen ◽  
Phillip Schendzielorz ◽  
Rudolf Hagen ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Cochlear Implantation ◽  
Tertiary Care ◽  
Resonance Imaging ◽  
Cochlear Duct ◽  
Tertiary Care Medical Center ◽  
Length Measurements ◽  
Cochlear Duct Length

Objective Growing interest in measuring the cochlear duct length (CDL) has emerged, since it can influence the selection of cochlear implant electrodes. Currently the measurements are performed with ionized radiation imaging. Only a few studies have explored CDL measurements in magnetic resonance imaging (MRI). Therefore, the presented study aims to fill this gap by estimating CDL in MRI and comparing it with multislice computed tomography (CT). Study Design Retrospective data analyses of 42 cochleae. Setting Tertiary care medical center. Methods Diameter (A value) and width (B value) of the cochlea were measured in HOROS software. The CDL and the 2-turn length were determined by the elliptic circular approximation (ECA). In addition, the CDL, the 2-turn length, and the angular length were determined via HOROS software by the multiplanar reconstruction (MPR) method. Results CDL values were significantly shorter in MRI by MPR ( d = 1.38 mm, P < .001) but not by ECA. Similar 2-turn length measurements were significantly lower in MRI by MPR ( d = 1.67 mm) and ECA ( d = 1.19 mm, both P < .001). In contrast, angular length was significantly higher in MRI ( d = 26.79°, P < .001). When the values were set in relation to the frequencies of the cochlea, no clinically relevant differences were estimated (58 Hz at 28-mm CDL). Conclusion In the presented study, CDL was investigated in CT and MRI by using different approaches. Since no clinically relevant differences were found, diagnostics with radiation may be omitted prior to cochlear implantation; thus, a concept of radiation-free cochlear implantation could be established.

Precise Evaluation of the Cochlear Duct Length by Flat-panel Volume Computed Tomography (fpVCT)—Implication of Secondary Reconstructions

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Philipp Schendzielorz ◽  
Lukas Ilgen ◽  
Tassilo Mueller-Graff ◽  
Laurent Noyalet ◽  
Johannes Völker ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Flat Panel ◽  
Cochlear Duct ◽  
Volume Computed Tomography ◽  
Precise Evaluation ◽  
Cochlear Duct Length

scholarly journals CT imaging-based approaches to cochlear duct length estimation—a human temporal bone study

2021 ◽  
Author(s):  
Tabita Breitsprecher ◽  
Anandhan Dhanasingh ◽  
Marko Schulze ◽  
Markus Kipp ◽  
Rami Abu Dakah ◽  
...  
Keyword(s):  
Computed Tomography ◽  
3D Reconstruction ◽  
Cone Beam ◽  
Rater Reliability ◽  
Cochlear Duct ◽  
Length Estimation ◽  
A Value ◽  
Planning Software ◽  
Cochlear Duct Length ◽  
Temporal Bones

Abstract Objectives 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. Methods 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 (CDLreference). Results A mean cochlear coverage of 74% (SD 7.4%) was found. The CDLreference showed significant differences to each other method (p < 0.001). The strongest correlation to the CDLreference was found for the otosurgical planning software-based method obtained from HRCT (CDLSW-HRCT; r = 0.87, p < 0.001) and from CBCT (CDLSW-CBCT; r = 0.76, p < 0.001). Overall, CDL was underestimated by each applied method. The inter-rater reliability was fair for the CDL estimation based on 3D reconstruction from CBCT (CDL3D-CBCT; intra-class correlation coefficient [ICC] = 0.43), good for CDL estimation based on 3D reconstruction from HRCT (CDL3D-HRCT; ICC = 0.71), poor for CDL estimation based on the A-value method from HRCT (CDLA-HRCT; ICC = 0.29), and excellent for CDL estimation based on the A-value method from CBCT (CDLA-CBCT; ICC = 0.87) as well as for the CDLSW-HRCT (ICC = 0.94), CDLSW-CBCT (ICC = 0.94) and CDLreference (ICC = 0.87). Conclusions 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 CDLA-CBCT, for CDLSW-HRCT, for CDLSW-CBCT, and for CDLreference. Key Points • 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.

Classification of Temporal Bone Pneumatization on Computed Tomography

Skull Base ◽  
2007 ◽  
Vol 16 (S 2) ◽  
Author(s):  
Su-Jin Han ◽  
Sang-Woo Moon ◽  
Mee-Hyun Song ◽  
Ho-Ki Lee
Keyword(s):  
Computed Tomography ◽  
Temporal Bone ◽  
Temporal Bone Pneumatization
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