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Little knowledge about wire grids

Used to filter out the effect of stray rays on the film

Should be placed between the human body and the film, most of the scattered rays can be filtered out, and only a small part of the scattered rays are leaked.


According to the structure:

1 Convergence grid: each lead strip is inclined to the focus, that is, the extension line of the lead strip is concentrated in the focus

2 Parallel grid: each lead bar is parallel to each other in the vertical plane

3 Cross gate: It is composed of two layers of parallel gates, and the directions of the lead bars are 90° to each other.

4 Circular arc grid: It is formed by superimposing the center to expand outward with equal radii, tile-shaped

According to material:

1 Commonly used wire grid: the internal spacer is a non-metallic material title, and the non-metallic low-density materials such as wood chips, paper chips, and plastics are used.

2 All-metal wire grid: the internal spacer is metal material: aluminum sheet, high strength, good moisture resistance


The appearance of the grid plate is a flat plate with a thickness of 4~8MM. The internal structure is composed of many thin lead strips arranged toward the focal point. The two lead strips are filled and positioned with an X-ray-transparent material and glued together. The filler can be wood, paper or aluminum sheets, etc. Finally, the top and bottom are encapsulated with thin aluminum plates to form a grid plate. From the cross-section, the arrangement direction of the lead strips of the filter plate will converge to one point. From the whole grid, there is a convergence line



1 Focal length: the vertical distance from the convergence line of the lead strip to the surface of the grid, f

2 Grid ratio: it is 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,

Parameters of fine X ray grid

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