本文应用画法几何投影变换方法来研究瞬时螺旋运动有关构造、位移等参数之间的几何关系。
In this paper, the method of geometric transformation is used to search the relationship between the parameters of construction and the displacement of the flop.
投影关系处理主要解决线素打断与拼接、几何元素投影关系链的建立；
The processing of projection relation mainly resolves the cutting and connecting of elements and the building of the relation list of geometry element projection.
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。
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.
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