该文采用小波矩量法求解导电平面上的三维腔体散射，利用小波变换稀疏化矩量矩阵，加速其求逆，减少了腔体散射的总体计算时间。
Scattering from three-dimensional cavities is solved using the wavelet-MoM method, while the moment matrix is sparsified with help of the wavelet transform.
采用图解法探讨三维实体的图形变换，明确给出了几种特殊显示的图形变换矩阵的参数表达式。
The paper adopts graph method to study 3d entity graphic conversion, and the parameter formulas of the graphic transformation matrix of the several special displays are clearly obtained.
对轴测投影和透视投影变换矩阵进行了研究，推出了三维图形变换的统一矩阵。
This paper studies the transformation matrixes for perspective projection and axonometric projection, deduces the general matrix for three dimensional graphic transformation.
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.
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.
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