Objective: to investigate the X-ray projection of acetabulum on its anterior and posterior column and to develop a safe area for screw placement.

目的：探讨髋臼在其前、后柱上的投影和螺钉放置的安全范围。

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Objective To establish 3D coronary artery motion tracking by the images of double plane X-ray projection and 3D CT volume sequence.

目的利用双平面X射线投影图像序列和参考CT容积图像进行冠状动脉的三维运动跟踪建模。

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Then geometrical transformation matrix between views is obtained based on perspective projection model for X-ray angiography system, and 3D coordinate of spatial points are calculated.

然后根据冠脉造影系统的透视投影模型得到两幅不同角度的造影图像之间的几何变换关系，以及空间点三维坐标的计算方法。

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