中文摘要：

目的：探讨建立CT扫描及三维重建技术观察人工耳蜗植入（CI）电极的方法，并比较不同CT扫描三维重建方法的耳蜗内植入电极的影像学特征及其临床应用价值。方法：6例CI患者全部作术后CT扫描并分别应用多层面重建的容积再现（VR）、平均密度投影（AIP）、表面遮盖显示技术（SSD）3种方法进行三维重建，观察人工耳蜗植入术后耳蜗内电极。结果：3种方法的三维重建图均可直观地显示电极形态、走行及其在耳蜗内植入的深度和植入电极与内耳的空间关系，并可清晰识别耳蜗内的电极数目。结论：CT扫描三维重建方法可直接观察植入电极的形态及位置，可准确判断电极在耳蜗内电极数目，有其独特的临床应用价值。

英文摘要：

Objective：To discuss the different methods of computed tomography （CT） scans and three dimensional reconstruction of inner ear with implanted electrodes, and to evaluate the value and image features of these methods. Method：Six cochlear implant （MEDEL Combi 40 ＋,Advanced Bionics ） recipients were involved in this study. The implanted electrodes of all patients were examined on the seventh postoperative day. The data of the CT scans was transferred to workstation for three-dimensional reconstruction by volum rendering （VR）, average intensity projection（AIP） and surface shaded display （SSD）. Result ： The three methods of three dimensional reconstruction provided satisfactory image of implanted electrode including the shape and the spacial relationship of the electrode in the inner ear. The insertion depth of the electrode can be evaluated directly. Moreover , each of the electrode pairs can be identified clearly. Conclusion： Postoperative evaluation of the implanted electrode with three methods of CT scans with three dimentiond reconstruction of inner ear provide more accurate image of the spacial relationship of the electrode in the cochlear canal with direct demonstration of electrode insertion depth in the cochlea.