...系统投影矩阵;中心切片定理;共扼梯度法;期望最大值法; [gap=2502]Key words】 non-scanning computed-tomograpby imaging spectrometer； system-projected matrix； the central slice theorem； conjugated gradient algorithm； expectation maxim..
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由于双平面X射线造影系统只能提供两幅有限的投影数据，冠状动脉树的三维重建在匹配、优化几何变换矩阵等方面存在困难。
The purpose of this study is to provide a 3D reconstruction of the skeleton of the coronary artery tree from two X-ray angiograms acquired on a biplane angiographic system.
基于灰色关联投影法的自行高炮武器系统效能评估，利用方案集、指标集、属性矩阵等初始条件。
SP AA gun system efficiency assessment was based on grey correlative projection method. The assessment model was established by making use of scheme volume, index volume, property matrix.
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