The laws of the ultimate capacity ratio of K-joints and KK joints (namely multiplanar coefficient) varying with the main geometrical parameters were obtained.
研究了KK型节点和K型节点极限承载力之比（即空间作用系数）随节点几何参数的变化规律。
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Then the effects of the voxel size, the geometrical mapping of the projection matrix and the ratio of detector size to imaging object size, on the spatial resolution were discussed.
We tested some PDC samples with different geometrical shapes and found that the geometrical shapes of PDC have a considerable influence on the testing results of the G-ratio of PDC.