Purpose

Assessment of the cochlear implant (CI) electrode array position using flat-detector computed tomography (FDCT) to test dependence of postoperative outcome on intracochlear electrode position.

Methods

A total of 102 patients implanted with 107 CIs underwent FDCT. Electrode position was rated as 1) scala tympani, 2) scala vestibuli, 3) scalar dislocation and 4) no deconvolution. Two independent neuroradiologists rated all image data sets twice and the scalar position was verified by a third neuroradiologist. Presurgical and postsurgical speech audiometry by the Freiburg monosyllabic test was used to evaluate auditory outcome after 6 months of speech rehabilitation.

Results

Electrode array position was assessed by FDCT in 107 CIs. Of the electrodes 60 were detected in the scala tympani, 21 in the scala vestibuli, 24 electrode arrays showed scalar dislocation and 2 electrodes were not placed in an intracochlear position. There was no significant difference in rehabilitation outcomes between scala tympani and scala vestibuli inserted patients. Rehabilitation was also possible in patients with dislocated electrodes.

Conclusion

The use of FDCT is a reliable diagnostic method to determine the position of the electrode array. In our study cohort, the electrode position had no significant impact on postoperative outcome except for non-deconvoluted electrode arrays.

中文翻译：

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人工耳蜗手术后的评估：使用平面探测器 CT 的临床结果和影像学发现的相关性。

目的

使用平面探测器计算机断层扫描 (FDCT) 评估人工耳蜗 (CI) 电极阵列的位置，以测试术后结果对耳蜗内电极位置的依赖性。

方法

共有 102 名植入 107 个 CI 的患者接受了 FDCT。电极位置被评为 1) 鼓阶、2) 前庭阶、3) 标量位错和 4) 无反卷积。两名独立的神经放射科医生对所有图像数据集进行了两次评级，并由第三名神经放射科医生验证了标量位置。Freiburg 单音节测试的术前和术后语音测听用于评估 6 个月的语音康复后的听觉结果。

结果

通过 FDCT 在 107 个 CI 中评估电极阵列位置。在鼓阶中检测到60个电极，在前庭阶中检测到21个，24个电极阵列显示标量错位，2个电极未放置在耳蜗内位置。鼓音阶和前庭阶插入患者的康复结果没有显着差异。电极脱位的患者也可以进行康复治疗。

结论

FDCT的使用是确定电极阵列位置的可靠诊断方法。在我们的研究队列中，除非去卷积电极阵列外，电极位置对术后结果没有显着影响。