Article Figures & Data
Figures
- Fig 1.
Axial 3D T2-weighted images from inferior to superior showing a normal osseous spiral lamina and interscalar septum. A, A normal osseous spiral lamina separating the scala tympani (posterior) and scala vestibuli (anterior) of the basal (anterior arrow) and middle turns (posterior arrow). B, A normal lateral R2 notch (arrow) associated with the second part of the interscalar septum between the upper basal and upper middle turns of the cochlea.
- Fig 2.
Axial 3D T2-weighted image through the cochlea in a normal-hearing ear. A, A normal lateral notch is demonstrated (arrow). B and C, At the same level, angle and depth measurements are demonstrated using electronic calipers (lines). The angle was measured as 84° with a depth of 0.6 mm.
- Fig 3.
Abnormal R2 notch in 2 different IP-II malformation ears, both with profound SNHL. A–C, A shallow obtuse notch is present (arrow). The scala vestibuli is enlarged (arrowheads) with anterior bowing and high insertion of the second part of the interscalar septum. The measured angle at the same level is 132° (B) with a depth of 0.3 mm (C). D and E, In the other patient, no lateral notch is seen (arrow) and the scala vestibuli is enlarged (arrowhead). At the same level, the angle is 180° and the depth is 0 mm (E).
- Fig 4.
Distribution of measurements of normal and abnormal ears by both novice readers.
Tables
ROC analysis for the 2 novice readers
ROC Model AUC 95% Confidence Interval Optimal Cutoff Sensitivity Specificity Reader 1 Angle 0.9676 0.9177–1 114.156 88% 100% Depth (mm) 0.9588 0.8983–1 0.31294 100% 90% Reader 2 Angle 0.9853 0.9593–1 103.874 94% 95% Depth (mm) 0.9647 0.8953–1 0.33536 100% 95% Note:—ROC indicates receiver operating characteristic; AUC, area under the curve.
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