The structural specifications of the grid determine the strength of the grid barrier scattering line. The main specifications are focal length, gate ratio and grid density. The focal length is understood to be the vertical distance from the convergence line of the lead strip to the midpoint of the grid. The focal length can also be understood as the radius. The gate ratio is the ratio as the name implies. The ratio of the lead strip height of the grid and the adjacent lead strip gap is generally expressed by R.

The formula is R=H/A, H is the height of the lead strip, and A is the phase. The distance between adjacent lead strips. That is, the higher the lead strip, the smaller the distance between adjacent lead strips, and the larger the grid ratio, the stronger the ability to block the scattered rays. The grid density is the number of lead strips present in a unit distance, denoted by N, N=1/B, and B represents the distance of adjacent lead strips, that is, the smaller the B value, the smaller the adjacent distance, within the unit distance. The larger the number of lead bars, the larger the grid density. On the contrary, the larger the B value, the larger the adjacent distance, the smaller the number of lead bars per unit distance, and the smaller the grid density. The larger the grid density value, the stronger the ability to filter out the scattered lines.

*Author：Alina*

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