螺旋CT对椎弓根螺钉固定术各种数据的测量应用

目的 利用螺旋CT轴位及三维成像的表面遮盖法(surface shaded display,SSD)为临床提供椎弓根螺钉固定术术前水平面进钉角(transverse screw angle,TSA)、进钉轴线长度、椎弓根最小横径及椎弓根进钉间距等测量的精确数据。方法 取螺旋CT轴位椎弓根最宽层面及SSD图像进行TSA、进钉轴线长度、椎弓根最小横径、椎弓根进钉间距的测量。结果 该方法协助临床术前确定TsA，螺钉长度与大小的准备，进钉点及进钉间距。提高椎弓根螺钉固定术的质量及成功率。结论 该方法为临床术前提供TsA，螺钉长度、大小，进钉点及进钉间距等精确数据，是一种简单可靠的方法。

The application of data measurement before the pedicle vertebral arch fixed operation with spiral CT

Objective I carry out volume scans and 3D surface reconstruction.Then I get the precise data of pedicle of vertebral arch, entering nail angle on horizontal direction, entering nail screw length, and the smallest horizontal diameter and entering nails' distance on pedicle of vertebral arch before the pedicle vertebral arch fixed operation. Method Select the axial image of the widest pedicle of vertebral arch and it SSD image, measure the entering nail distance on the pedicle of vertebral arch, TSA, entering nail screw length, and the smallest horizontal diameter of the pedicle of vertebral arch. Result The method helps to prepare the length, size and location of the nail and TSA for the pedicle of vertebral arch fixed operation. Increase the operation success rate. Conclusion This is a simple and reliable method to prepare the precise data of the nail length and size, TSA for the operation.