X ray grid types should be placed between the human body and the film, which can filter most of the scattered rays, and only a small part of the scattered rays will leak.
The structure of x ray grid types and the specifications of the grid: x ray grid types have the following three main technical parameters:
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 lead bar height to the lead bar gap, R
3. Grid density: the number of lead bars within a unit distance, N
According to the structure:
1 Convergence grid: each lead strip is inclined to the focus, that is, the extension line of the lead is concentrated on the focus
2 Parallel grid: each lead bar is parallel to each other in the vertical plane
3Cross grid: It is composed of two layers of parallel grids, and the lead strips are 90° to each other.
4Circular arc grid: It is formed by overlapping from the center outwards with equal radius, tile-shaped
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