Article Figures & Data
Figures
- Fig 1.
The vestibular aqueduct as seen on axial (A), coronal (B), sagittal (C), and the 45° oblique (Pöschl) (D) planes (arrows). It can be seen along its entire longitudinal length on the 45° oblique plane, but only partially on the other planes. It also appears wider on the axial, coronal, and sagittal planes, due to the oblique orientation of its cross-section relative to these planes, which may lead to overestimation of its width when measurement is made in these planes.
- Fig 2.
CT image of the vestibular aqueduct in the 45° oblique plane. The midpoint of the vestibular aqueduct is identified, and a line (shown in black) is drawn perpendicular to its wall. The width is measured along this line.
- Fig 3.
The vestibular aqueduct of a cadaveric temporal bone displayed in the 45° oblique plane (arrow), in a histologically processed microtome section (A) and in a CT image (B).
- Fig 4.
A graph of the distance along a line drawn through the midpoint of the vestibular aqueduct (x-axis) plotted against CT attenuation in Hounsfield units at each point along this line (y-axis). The optimal percentage attenuation is denoted on the graph. Through radiologic-histologic correlation by using the cadaveric temporal bone specimen, the OPA was found to be 30%.
- Fig 5.
Scatterplot showing comparison between the subjective and objective techniques. Each point denotes the midpoint vestibular aqueduct measurement made by using the subjective (visual assessment) technique (x-axis) plotted against that made by using the objective (modified full width at half maximum/OPA) technique (y-axis). The Pearson correlation coefficient is r = 0.566.
Tables
- Table 1:
Vestibular aqueduct width obtained using the subjective and objective techniquesa
Measurement Technique Mean VA Width (range) (mm) (n = 192) VA Width at the 95th Percentile VA Width at the 97.5th Percentile Subjective (visual assessment) technique 0.527 ± 0.08 (0.353–0.887) 0.666 0.702 Objective (OPA) technique 0.537 ± 0.077 (0.331–0.922) 0.658 0.717 Note:—VA indicates vestibular aqueduct.
↵a Units are in millimeters.
- Table 2:
Pearson correlation coefficients to determine the precision of various measurements made
Pearson Correlation Coefficient Intraobserver Reader 1 0.538 Reader 2 0.648 Interobserver First measurement of reader 1 vs 2nd measurement of reader 2 0.506 Second measurement of reader 1 vs 1st measurement of reader 2 0.522 Subjective (visual assessment) vs objective (OPA) technique Reader 1 0.499 Reader 2 0.566
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