Dutt Sunil Narayan, Gaur Sumit Kumar, Vadlamani Swathi, Nandikur Shrivalli
Department of Otorhinolaryngology, Head and Neck Surgery, Apollo Hospitals, 154/11, Bannerghatta Road, Opposite IIM, Bangalore, 560076 India.
Department of Radiology, Apollo Hospitals, Bangalore, India.
Indian J Otolaryngol Head Neck Surg. 2022 Dec;74(Suppl 3):3998-4006. doi: 10.1007/s12070-021-02774-8. Epub 2021 Aug 5.
To develop an accurate protocol for measuring the Cochlear Duct Length (CDL) by using Multi Detector Computerized Tomography (MDCT) imaging of the temporal bones and thereby make the appropriate choice of electrode for cochlear implantation. 79 MED-EL® Cochlear implantees were divided into three cohorts in chronological order of their implantation. CDL was calculated from MDCT images and correlated with the CDL calculated using the existing Jolly's formula. Results of the CDL measured by unfurling the cochlea correlated well with the existing formula. In addition to CDL measurement, measuring diameter of each turn, especially the apical turn, helped in choosing the appropriate electrode for complete cochlear coverage. Having dedicated radiographers and neuro-radiologists can avoid inter-observer variations in CDL measurements. Measuring the CDL and the diameter of each turn helps in choosing an appropriate electrode thus minimizing intra-operative difficulties and achieving complete safe insertion.
通过使用颞骨的多探测器计算机断层扫描（MDCT）成像来制定一种准确测量蜗管长度（CDL）的方案，从而为人工耳蜗植入选择合适的电极。79名MED-EL®人工耳蜗植入者按植入时间顺序分为三组。从MDCT图像计算CDL，并与使用现有乔利公式计算的CDL进行相关性分析。通过展开耳蜗测量的CDL结果与现有公式相关性良好。除了测量CDL外，测量每一圈的直径，尤其是蜗顶圈的直径，有助于选择合适的电极以实现对耳蜗的完全覆盖。配备专业的放射技师和神经放射科医生可以避免CDL测量中的观察者间差异。测量CDL和每一圈的直径有助于选择合适的电极，从而最大限度地减少术中困难并实现完全安全插入。
