Determination of the position of nucleus cochlear implant electrodes in the inner ear.
Determination of the position of nucleus cochlear implant electrodes in the inner ear.
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发表时间：
1994-09
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通讯作者：
M. Skinner;D. Ketten;M. Vannier;G. Gates;R. Yoffie;W. Kalender
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作者：
M. Skinner;D. Ketten;M. Vannier;G. Gates;R. Yoffie;W. Kalender
准确确定耳蜗植入患者的颅内电极位置可以为检测植入物的迁移提供依据，并有助于选择声音处理器编程的刺激参数。新的计算机算法，亚毫米分辨率和三维重建螺旋计算机断层扫描（CT）扫描，现在有可能准确地确定植入的电极在耳蜗管内的位置。使用放置在体模模型中的电极阵列测试这些算法的准确性。螺旋CT扫描重建的电极长度和电极间距离的测量结果与立体显微镜的测量结果非常一致。尽管由于部分体积平均，CT扫描上的表观电极宽度增加，但为传统X线片的测量值开发了校正因子，并增加了扩展的CT吸收值量表，以检测是否存在铂电极和铂丝。根据1例患者术前螺旋CT扫描计算耳蜗管长度，根据术后螺旋CT扫描计算电极阵列插入长度。测量电极相对于外骨壁和蜗轴的横截面位置，并将其绘制为应用电极宽度校正的距离的函数。
Accurate determination of intracochlear electrode position in patients with cochlear implants could provide a basis for detecting migration of the implant and could aid in the selection of stimulation parameters for sound processor programming. New computer algorithms for submillimeter resolution and 3-D reconstruction from spiral computed tomographic (CT) scans now make it possible to accurately determine the position of implanted electrodes within the cochlear canal. The accuracy of these algorithms was tested using an electrode array placed in a phantom model. Measurements of electrode length and interelectrode distance from spiral CT scan reconstructions were in close agreement with those from stereo microscopy. Although apparent electrode width was increased on CT scans due to partial volume averaging, a correction factor was developed for measurements from conventional radiographs and an expanded CT absorption value scale added to detect the presence of platinum electrodes and wires. The length of the cochlear canal was calculated from preoperative spiral CT scans for one patient, and the length of insertion of the electrode array was calculated from her postoperative spiral CT scans. The cross-sectional position of electrodes in relation to the outer bony wall and modiolus was measured and plotted as a function of distance with the electrode width correction applied.