...过投影中心的平面，称为投影平面（Projection Plane）；从投影中心向物体的每一点引射线，这些射线称为投影线（Projection Ray），投影线与投影平面的交点集合就称为三维物体在二维投影平面上的投影。
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projection cathode ray tube 投射式显像管
projection cathode-ray tube 投射式阴极射线管
x ray projection microradiography x射线显微照相术
soft x ray projection lithography 软x射线投影光刻
soft x-ray projection lithography 软x
projection-cathode-ray tube [电子] 投射式阴极射线管
ray sum-projection 综合透明投影
ray projection microscope 释义X线投影显微镜
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。
Other modalities are used in radiography when traditional projection X-ray cannot image what doctors want to see.
其他方式使用放射时，传统投影X射线无法医生希望看到的影像。
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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