分析了圆锥轴线为正平线时，在水平面投影图中轮廓线的投影。
The H-project of a cone whose axis is parallel to V-plane is analysed.
方法对82例椎弓完整性腰椎滑脱症的正侧位、双斜位X线平片及CT图像(24例加作CT扫描)进行分析。
Methods To analyse X-ray images of lumbar vertebrae positive side and left-right oblique position plain films and CT images (only 24 cases) of 82 patients.
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