ENT Institute, Eye & ENT Hospital, Fudan University, Shanghai, China; Department of Facial Plastic and Reconstructive Surgery, Eye & ENT Hospital, Fudan University, Shanghai, China.
Xinxiang Engineering Technology Research Center of Intelligent Rehabilitation Equipment, Xinxiang Medical University, Xinxiang, Henan, China; Department of Aeronautics and Astronautics, Fudan University, Shanghai, China.
Int J Pediatr Otorhinolaryngol. 2020 Oct;137:110233. doi: 10.1016/j.ijporl.2020.110233. Epub 2020 Jul 10.
To describe a measurement method for external auditory canal (EAC), especially in congenital aural stenosis (CAS).
High-resolution CT (HRCT) datasets of CAS were imported into the MIMICS 15.0 software for image processing. We used two methods to evaluate the degree of CAS. One is sagittal reconstruction measurement method, the minor axis of the bony ear canal was measured in each layer using sagittal reconstruction. The other is Matlab procedure calculation, we calculated the midpoint axis values of the EAC in each Frankfurt plane. Finally, we compared the minimum value of each method, and verified the sagittal reconstruction measurement method retrospectively in the CAS cases without cholesteatoma who had undergone meatoplasty.
Twenty CAS cases were selected using the sagittal reconstruction measurement method and Matlab procedure calculation to evaluate the degree of CAS. The mean age was 9.55 ± 2.85 years old (range: 6-15). The mean degree of CAS was 2.09 ± 0.50 mm by sagittal reconstruction measurement method and 2.03 ± 0.58 mm by Matlab procedure calculation. There were no significant differences in the two groups (t = -1.371, p = 0.186). A total of 94 HRCT datasets were imported into MIMICS for verification. The mean age was 11.66 ± 6.56 years old (range: 6-39). Mean stenosis of EAC at surgery was 2.88 ± 0.93 mm (range: 1-4) by using sagittal reconstruction measurement method.
Matlab procedure calculation is precise but relatively complicated and is only for scientific research. The sagittal reconstruction measurement method to calculate the most stenotic part of the bony ear canal is relatively simple and accurate to evaluate the degree of CAS. In cases of CAS without cholesteatoma, the precise measurement was critical for the next consultation.
描述一种外耳 道（EAC）的测量方法，特别是在先天性耳 道狭窄（CAS）中。
将 CAS 的高分辨率 CT（HRCT）数据集导入 Mimics 15.0 软件进行图像处理。我们使用两种方法来评估 CAS 的程度。一种是矢状重建测量方法，在每个矢状位重建层测量骨性耳道的小轴。另一种是 Matlab 程序计算，我们计算每个 Frankfurt 平面中 EAC 的中点轴值。最后，我们比较了每种方法的最小值，并在没有胆脂瘤且接受了 外耳道成形术的 CAS 病例中回顾性验证了矢状重建测量方法。
使用矢状重建测量方法和 Matlab 程序计算选择了 20 例 CAS 病例来评估 CAS 的程度。平均年龄为 9.55±2.85 岁（范围：6-15）。矢状重建测量法的平均 CAS 程度为 2.09±0.50mm，Matlab 程序计算法为 2.03±0.58mm。两组之间无显著性差异（t=-1.371，p=0.186）。共将 94 例 HRCT 数据集导入 Mimics 进行验证。平均年龄为 11.66±6.56 岁（范围：6-39）。使用矢状重建测量法，手术时 EAC 的平均狭窄程度为 2.88±0.93mm（范围：1-4）。
Matlab 程序计算虽然精确但相对复杂，仅用于科学研究。矢状重建测量方法计算骨性耳道最狭窄部分相对简单，能准确评估 CAS 的程度。在没有胆脂瘤的 CAS 病例中，精确测量对下一步咨询至关重要。
