Aebischer Philipp, Meyer Stefan, Caversaccio Marco, Wimmer Wilhelm
IEEE Trans Biomed Eng. 2021 Feb;68(2):545-555. doi: 10.1109/TBME.2020.3006934. Epub 2021 Jan 20.
Cochlear implant impedances are influenced by the intracochlear position of the electrodes. Herein, we present an intuitive approach to calculate tissue resistances from transimpedance recordings, ultimately enabling to estimate the insertion depth of cochlear implant electrodes.
Electrode positions were measured in computed-tomography images of 20 subjects implanted with the same lateral wall cochlear implant model. The tissue resistances were estimated from intraoperative telemetry data using bivariate spline extrapolation from the transimpedance recordings. Using a phenomenological model, the electrode insertion depths were estimated.
The proposed method enabled the linear insertion depth of all electrodes to be estimated with an average error of 0.76 ± 0.53 mm.
Intraoperative telemetry recordings correlate with the linear and angular depth of electrode insertion, enabling estimations with an accuracy that can be useful for clinical applications.
The proposed method can be used to objectively assess surgical outcomes during and after cochlear implantation based on non-invasive and readily available telemetry recordings.
人工耳蜗的阻抗受电极在耳蜗内位置的影响。在此，我们提出一种直观的方法，可根据跨阻抗记录计算组织电阻，最终能够估计人工耳蜗电极的插入深度。
在20名植入相同侧壁人工耳蜗模型的受试者的计算机断层扫描图像中测量电极位置。使用基于跨阻抗记录的双变量样条外推法，从术中遥测数据估计组织电阻。利用一个唯象模型估计电极插入深度。
所提出的方法能够估计所有电极的线性插入深度，平均误差为0.76±0.53毫米。
术中遥测记录与电极插入的线性和角度深度相关，能够进行精度足以用于临床应用的估计。
所提出的方法可用于基于无创且易于获得的遥测记录，客观评估人工耳蜗植入期间及之后的手术效果。
