HRCT三维重建在视神经管骨折中的应用

Clinical Application of HRCT 3D-Reconstruction in the Fracture of Optic Canal

目的：探讨HRCT多平面重建技术在视神经管骨折中的临床应用价值。材料与方法：以前床突与眶下缘连线为基线。行单系列轴位扫描。层厚1mm，重建间隔1mm。螺距选择1-1．5。进行多平面重建（MPR）、表面遮盖显示（SSD）及最大密度投影（MIP）三种算法进行重建。结果：①20例中24只眼眶视神经管骨折。内、外壁骨折18只眼。占75％。上、下壁骨折6只眼。占25％。②视神经受压5只眼。占21％。视神经增粗6例。③MPR重建结合轴位能100％显示骨折。SSD骨折显示率为33％。MIP骨折显示率为63％。结论：HRCT三维重建可提高视神经管骨折显示率。弥补不做冠状位CT扫描的不足。

Purpese： Toevaluate the clinical value of HRCT multiplane reconstruction （MPR） in the fracture of optic canal. Materials and Methods： The study of fracture of optic canal was performed on transverse axial CT scanning images （thickness 1mm, interval 1mm, pitch 1 - 1.5） for 20 cases. And it was reconstructed by mulfiplane reconstruction （MPR）, shaded surface display （SSD）, maximum intensity projection （MIP）. Results： ① 24 fracture of optic canal in 20 cases were shown by CT, which included 18 cases of fracture in medial or lateral wall （75%） and 6 in superior or inferior wall （25%）. ②Optic nerve oppressing was shown in 5 eyes and largening was shown in 6 eyes.③The fracture of optic canal can be shown in all cases （100%） by MPR combining with axial scanning, while 33% by SSD and 63 % by MIP. Conclusion： HRCT 3 - D reconstruction plays a good role in showning the fracture of optic canal.