The appearance of the X-ray grid is a flat plate with a thickness of 4 ~ 8mm. The internal structure is formed by intersecting many thin lead bars. The two lead bars are filled with X-ray transparent material for positioning, and are bonded together. The filler can be wood, paper or aluminum sheet. Finally, it is encapsulated with a thin aluminum plate to form a filter grid. Seen from the cross section, the arrangement direction of the lead strips of the filter plate will converge to a little. From the whole X-ray grid, there is a convergence line
1 Focal length: the vertical distance from the lead convergence line to the grid surface, f
2 Grid ratio: also a grid ratio, which is the ratio of the height of the lead bar to the gap of the lead bar, R
3 Grid density: the number of lead bars per unit distance, N
Exposure coefficient B:
It is generally believed that the exposure coefficient of the X-ray grid is one of the criteria for measuring a grid. The exposure coefficient B is the ratio of the exposure required to obtain the same density value when the grid is not used and after the grid is used The B value is generally between 2 and 6. The smaller the B value of the grid with the same performance, the better. Moreover, when performing X-ray photography, the thickness of the limbs generally exceeds 15cm and the X-ray grid is used.
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