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目的探讨双源CT各向同性技术在内听道解剖研究中的价值。方法应用双源CT对402例正常志愿者行颞骨薄层扫描,多平面重建,观察内听道的形态,并对各相关径线进行测量。结果经两位从事影像阅片工作多年医师评估,所有图像内听道结构显示清晰,内听道形态中平行管状699耳,喇叭口状53耳,壶腹状50耳,不规则型2耳。内听道长度为(9.81±1.83)mm,内听道底管径(最大径×最小经)为(5.08±0.74)mm×(3.25±0.61)mm,中段管径(最大径×最小经)为(5.04±0.96)mm×(4.23±0.79)mm,内耳门区前后径(5.05±1.05)mm,内耳门区上下径(5.66±1.20)mm。结论DSCT在各向同性方面的优势,能够从不同角度多方位观察内听道的空间立体形态,在此基础上对其相关径线进行精确测量,真正实现了活体观测。
Objective To investigate the value of dual-source CT isotropic technique in the study of internal auditory canal anatomy. Methods Dual-source computed tomography (CT) was used to scan 402 cases of normal volunteers with multi-planar reconstruction of the temporal bone. The shape of the internal auditory canal was observed and the related diameters were measured. Results The results of two years of radiologists engaged in radiologists showed that the structure of auditory canal was clear in all the images. The shape of the auditory canal was 699 parallel tubes, 53 trumpets, 50 ampullaetes and 2 irregular ears. The length of the internal auditory canal was (9.81 ± 1.83) mm, and the diameter of the internal auditory canal bottom was (5.08 ± 0.74) mm × (3.25 ± 0.61) mm. The diameter of the middle segment (the largest diameter × the smallest one) (5.04 ± 0.96) mm × (4.23 ± 0.79) mm, the anterior and posterior diameter of the inner ear door (5.05 ± 1.05) mm and the diameter of the inner ear door (5.66 ± 1.20) mm. Conclusion The advantages of DSCT in isotropy can be observed from different perspectives in different directions to observe the spatial stereoscopic morphology of the internal auditory canal. On this basis, the accurate measurement of the related radial lines can be achieved.