He Xuebin, Feng Yong, Chen Dengming, Mei Lingyun, He Chufeng, Cai Xinzhang
Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central-South University, Changsha, 410008, China.
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2011 May;25(10):433-5.
In order to provide help for preoperative assessment of cochlear implantation, related dissection of temporal bone was conducted guided by high resolution computerized tomography (HRCT) in accordance to the main steps of cochlear implantation, and was compared to HRCT measurements on a viewing workstation.
Six temporal bones were dissected according to the main steps of cochlear implantation and scanned in axial and semilongitudal planes by HRCT to observe the relationship between anatomy and HRCT.
The width of facial recess in dissection was (3.13 +/- 0.34) mm at the level of round window, and (4.12 +/- 0.44) mm at the level of oval window. The width of facial recess in HRCT was (3.20 +/- 0.38) mm at the level of round window, and (4.14 +/- 0.47) mm at the level of oval window. The whole course of facial nerve was visualized clearly in semilongitudal plane. No statistically significant differences were found between the results of dissection and HRCT.
The distance in axial between facial nerve and posterior wall of external auditory canal and the distance from facial nerve to round window in semilongitudal plane are the most important parameters which reflect the position of facial nerve. The vertical portion of facial nerve, posterior wall of external auditory canal, round window are important measurement landmarks. Related preoperative measurements of cochlear implantation by HRCT can help to guide clinic surgery.
为人工耳蜗植入术前评估提供帮助，按照人工耳蜗植入的主要步骤，在高分辨率计算机断层扫描（HRCT）引导下进行颞骨相关解剖，并在观察工作站上与HRCT测量结果进行比较。
按照人工耳蜗植入的主要步骤对6个颞骨进行解剖，并通过HRCT在轴位和半矢状位平面进行扫描，以观察解剖结构与HRCT之间的关系。
解剖时面神经隐窝在圆窗水平的宽度为（3.13±0.34）mm，在卵圆窗水平的宽度为（4.12±0.44）mm。HRCT显示面神经隐窝在圆窗水平的宽度为（3.20±0.38）mm，在卵圆窗水平的宽度为（4.14±0.47）mm。在半矢状位平面可清晰显示面神经全程。解剖结果与HRCT结果之间未发现统计学上的显著差异。
面神经与外耳道后壁的轴位距离以及半矢状位平面上面神经到圆窗的距离是反映面神经位置的最重要参数。面神经垂直段、外耳道后壁、圆窗是重要的测量标志。HRCT进行人工耳蜗植入相关术前测量有助于指导临床手术。
