多层螺旋CT面神经管全程多平面重组显示及其在骨折中的诊断价值

目的 经重组得到2幅显示面神经管(FNC)全程的斜位多平面重组(MPR)图像,并验证其在骨折中的诊断效能.资料与方法 收集100耳正常颞骨CT图像(正常组),经MPR得到同层显示FNC鼓室段、锥曲及乳突段的斜位图像A与同层显示迷路段、膝状窝及鼓室段的斜位图像B,计算斜位图像A、B的MPR重组成功率.选择43耳经手术证实的FNC骨折CT图像(对照组),计算斜位图像A、B重组成功率,对比分析诊断模式Ⅰ(常规轴位+冠状位)与诊断模式Ⅱ(常规轴位+冠状位+斜位图像A或B)对骨折显示率的差异.结果 正常组斜位图像A、B重组成功率分别为96.00％、97.00％.对照组斜位图像A、B重组成功率分别为97.67％、95.35％,模式Ⅰ对骨折显示率为48.84％,模式Ⅱ对骨折显示率为81.40％,两者对骨折显示率差异有统计学意义(P＜0.05).结论 通过本文的MPR固定重组步骤,可用2幅斜位图像显示FNC全程,常规轴位和冠状位图像与斜位图像A或B联合应用可提高FNC骨折的诊断准确性.

Manifestation and Diagnostic Value of Multislice Spiral CT with Multi-plane Reformation in Evaluating Facial Nerve Canal Fracture

Purpose To investigate the diagnostic efficacy of two oblique multi- plane reformation (MPR) images in the whole facial nerve canal (FNC) fracture. Materials and Methods The normal temporal bone CT images of 100 ears (normal group) were collected. Oblique MPR image A was obtained to display the tympanic segment, pyramidal segment and mastoid segment of FNC in the same plane. Oblique MPR image B was obtained to display the labyrinthine segment, geniculate fossa and tympanic segment in the same plane. 43 ears of FNC fracture confirmed by surgery (control group) were reviewed. The success rate of MPR was calculated in the two groups. Fracture display rate of diagnostic mode Ⅰ (conventional axial+coronal) and diagnostic mode Ⅱ (conventional axial+coronal+oblique image A or B) were compared. Results The success rates of MPR in image A and B of normal group and control group were 96.00% and 97.00%, 97.67% and 95.35%, respectively. The fracture display rates of mode Ⅰ and mode Ⅱ were 48.84% and 81.40%, respectively with statistical difference (P <0.05). Conclusion Two MPR images of the whole course of FNC can be displayed. MPR image A and B combined with conventional axial and coronal images can improve diagnostic accuracy in FNC fracture.