From the geometrical representation of the phase function, it is pointed out that the thermodynamic phase equilibrium diagram is in essence a projection diagram of phase function.
由相函数的几何表象得出：热力学相平衡图实质上是相函数的投影图。
2
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.
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.