国人内听道DSCT的解剖研究

目的应用双源CT（dual source computed tomography,DSCT）观察国人内听道的形态,并测量内听道各径线数值,探讨其临床应用价值。方法对正常志愿者402例804耳行颞骨薄层扫描,多平面重建,观察内听道的形态,并对各相关径线进行测量。结果内听道形态为平行管状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（9.810±1.830）mm,内听道底管径为（5.084±0.739）mm×（3.246±0.613）mm,中段管径为（5.044±0.956）mm×（4.228±0.791）mm,内耳门区前后径为（5.049±1.05）mm,内耳门区上下径为（5.657±1.196）mm。两侧内听道各测量数值统计学上无显著差异;男女之间有统计学差异,这与文献报道不同;部分年龄组之间也有统计学差异。结论DSCT薄层扫描后多平面重建可清楚显示内听道的形态,并能精确测量内听道的管径及长度,对活体解剖测量具有指导意义,为临床和影像检查提供诊断依据。

A study of internal auditory canal anatomy in adult Chinese using dual source computed tomography

Objective To assess the value of dual source computed tomography (DSCT) in clinical practice for demonstrating anatomy of internal auditory canal (IAC). Methods A total of 402 healthy adults(804 ears) were includ ed in this study. Thin-section CT scans of the temporal bone were obtained. The IAC were examined and measured on multi-planer reconstruction(MPR) images. Results IAC morphology can be characterized as cylinder(n= 699), trumpet (n=53), ampulla (n=50) and irregular (n=2). The length of the IAC was 9.810 ± 1.830 mm. The cross caliber of the IAC was 5.084 ± 0.739 mm×3.246 ± 0.613 mm near the fundus and 5.044 ± 0.956 mm × 4.228 ± 0.791 mm in the middle sec tion. The antero-posterior diameter of the internal auditory foramen (INF) was 5.049 ± 1.05 mm and the height was 5.657 ± 1.196 mm. There was no statistically significant difference in these measures between the left and right IACs, although statistically significant differences were noticed between sexes (contrary to literature reports) and among some age groups. Conclusion Anatomy of the IAC can be clearly displayed and measured on DSCT. MPR images can guide vivi section and facilitate clinical diagnosis.