Comparison of 45° Oblique Reformats with Axial Reformats in CT Evaluation of the Vestibular Aqueduct

• DOI: 10.3174/ajnr.a0735
• Publication Date: 2007-10-19T00:54:20Z
• Authors: B. Ozgen; M.E. Cunnane; P.A. Caruso; H.D. Curtin
• Keywords: Vestibular aqueduct; Aqueduct

<b>BACKGROUND AND PURPOSE:</b> Measurement of the vestibular aqueduct on CT scans temporal bone is important for detection large syndrome; typically this done in axial plane. We sought to determine usefulness reformats performed 45° oblique plane evaluating aqueduct. In addition, we provide reference measurements <b>MATERIALS AD METHODS:</b> selected 15 subjects referred reasons other than sensorineural hearing loss, and without radiographic evidence abnormality inner ear. Two neuroradiologists independently evaluated both images ease visualizing Then, one readers (B.O.) diameter at mouth midpoint <b>RESULTS:</b> Combining results observers, judged 82% aqueducts as well-defined or easily traced views, whereas only 55% views. The difference degrees visualization between was significant observer 1 (<i>P</i> =.022) 2 =.001). Intraobserver agreement about visibility higher views: (κ = 0.682, SE 0.171) reformats; 0.480, 0.145) reformats. On reformats, mean external aperture dimension measured 0.616 ± 0.133 mm, postisthmic segment had a width 0.482 0.099 mm. <b>CONCLUSIONS:</b> gives more reliable depiction evaluation bone. This technique can be useful cases borderline enlargement