What is the grid ratio of the grid?

There are many sizes of grids. According to different requirements, the grid ratio, grid density, and focal length of the grid are also different. So what is the grid ratio of the grid?
The grid ratio (R) of the grid is defined as the ratio of the grid height (h) to the grid gap (D), which is usually 10:1 or 8:1, and other grids can also be customized according to the needs of different customers Compare. The appearance of the grid is a flat plate with a thickness of 4~8mm. The internal structure is formed by the intersecting arrangement of many thin lead strips. The space between the two lead strips is filled with an X-ray-transparent substance and glued together. The filler can be wood, paper or aluminum sheet etc. Finally, the top and bottom are packaged with thin aluminum plates to form a grid plate. Seen from the cross-section, the arrangement direction of the lead strips of the filter plate will converge to one point. Viewed from the entire grid, there is a convergent line.
According to the structure, the grid can be divided into convergent grid, parallel grid, cross grid and arc grid.
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Author：X Ray Grids Maker