螺旋矩阵是指一个呈螺旋状的矩阵，它的数字由第一行开始到右边不断变大，向下变大， 向左变大，向上变大，如此循环。（如图1） 图1
采用螺旋理论，首先分别建立了3 - UPU并联角台机构在初始位形下和沿x轴方向发生移动后的一阶影响系数矩阵。
Based on the screw theory, the first-order effect coefficient matrixes of a 3-upu parallel pyramid mechanism under initial position and movement along X-coordinate axis are established.
目的探讨64层螺旋CT下肢动脉血管成像的最佳注射速率与重建矩阵的选择。
Objective To investigate the optimal injection rate and reconstruction matrix in 64-slice spiral CT lower extremity artery angiography.
为实现矩阵快速求逆，文中采用了螺旋边界条件下谱因式分解的方法。
Fortunately, however, the matrix has striped shape with a helical boundary conditions.
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