Objective: To explore the feasibility of cone beam computed tomography (CBCT) in quantitatively assessing singular nerve canal and to propose a method to locate singular nerve canal in CBCT imaging. Methods: Eight cadaveric heads were scanned using CBCT and images of 16 temporal bones were obtained.The diameters of three points of singular nerve canal were measured which included the internal auditory canal aperture, the central turning area, and the aperture of ampulla of the posterior semicircular canal.The length of singular canal was measured.The distances from the three points to the inner edge of round window were measured.The best oblique axial plane to display the whole course of singular canal was adjusted and the angle between this plane and the lateral semicircular canal was measured.Two independent sample t-test was used to compare the left and right measurements. Results: The mean diameters of the three points were(0.98±0.51), (0.36±0.05) and(0.38±0.06) mm respectively.The mean length of singular nerve canal was(4.16±0.87) mm.The mean angle was 19.1°±10.2°.2D and 3D location graphs of singular nerve canal were made with the distance between the three points on singular nerve canal and the medial end of the round window.There was no significant statistical difference between left and right side in all the measurement (all P>0.05). Conclusion: CBCT can clearly display the whole course of singular nerve canal.Measurement can be done on CBCT images, and the specific location of singular nerve canal can be determined, which are important for surgery.目的： 应用锥形束CT(CBCT)对单神经管进行成像，对单神经管相关径线进行定量分析，进一步观察单神经管，提供在CBCT上定位单神经管的方法。 方法： 2017年1月，利用CBCT对8具头部标本扫描，获得16侧颞骨图像，在标准横断面上依次测量单神经管内听道底开口、中间段、后半规管壶腹开口直径及单神经管长度；以圆窗内缘所在点为基准点，分别测量单神经管内听道开口点、中央转折点、后半规管壶腹开口点至基准点的相对距离，对单神经管进行绘图定位；调节显示单神经管最佳横断面，测量该层面与水平半规管夹角。左、右侧测量值比较采用两独立样本t检验。 结果： 单神经管内听道开口直径0.40～1.90 mm，平均(0.98±0.51) mm；中段直径0.30～0.40 mm，平均(0.36±0.05) mm；后半规管壶腹开口直径0.30～0.50 mm，平均(0.38±0.06) mm。单神经管长度2.85～5.75 mm，平均(4.16±0.87) mm。显示单神经管全程斜横断面与水平半规管夹角8.5°～42.5°，平均19.1°±10.2°。根据单神经管三点与圆窗内缘相对距离，绘制单神经管二维及三维位置坐标图。各测量值左、右侧差异均无统计学意义(均P>0.05)。 结论： CBCT可清晰显示单神经管全程走行，在CBCT图像上可对单神经管进行相应测量，从而判断单神经管具体位置，为临床手术提供直观依据。.
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