Macquarie University.
Castlereagh Imaging, Westmead.
Otol Neurotol. 2018 Oct;39(9):e757-e764. doi: 10.1097/MAO.0000000000001934.
: Developing a clinically viable technique for measuring cochlear length could enhance future electrode design of cochlear implants and surgical skills to improve clinical outcomes. While computed tomography (CT) has been used, metal artifact and the exposure to higher levels of radiation limits its use. More recently, cone beam CT (CBCT) has been used to assess the integrity of the implant array in situ, exposing implantees to lower levels of radiation while retaining image quality. The current study aims to develop a technique for measuring cochlear length in implanted adults, using CBCT images combined with known dimensions of implant arrays and lengths of cochlear structures from cadaveric human temporal bones.
One hundred CBCT temporal bone images of ears implanted with Cochlear straight or perimodiolar arrays were reviewed by two independent examiners.
Outer-wall length, based on the position of the straight array within the cochlea and the reported average length of the organ of Corti, was 27.44 to 35.91 mm (mean = 32.24 mm). Inner-wall length, based on the position of the perimodiolar array and the reported average length of the spiral ganglion, ranged from 17.8 to 22.24 mm (mean = 19.43 mm).
A novel method for calculating outer- and inner-wall cochlear length using CBCT images has been developed which is feasible in clinical settings.
开发一种可行的耳蜗长度临床测量技术，可以增强未来的耳蜗植入电极设计和手术技能，以改善临床结果。虽然已经使用了计算机断层扫描（CT），但金属伪影和更高水平的辐射限制了其使用。最近，锥形束 CT（CBCT）已用于评估植入物阵列的原位完整性，在保留图像质量的同时，使植入物暴露于较低水平的辐射下。本研究旨在开发一种使用 CBCT 图像结合已知植入物阵列尺寸和尸检人颞骨耳蜗结构长度来测量植入成人耳蜗长度的技术。
对 100 个植入 Cochlear 直型或 periModiolar 阵列的 CBCT 颞骨图像进行了两名独立检查者的回顾。
基于直型阵列在耳蜗内的位置和报道的 Corti 器官的平均长度，外壁长度为 27.44 至 35.91mm（平均 32.24mm）。基于 periModiolar 阵列的位置和报道的螺旋神经节的平均长度，内壁长度范围为 17.8 至 22.24mm（平均 19.43mm）。
已经开发出一种使用 CBCT 图像计算外壁和内壁耳蜗长度的新方法，该方法在临床环境中是可行的。
