X-ray grid focal length

The focal length of the X-ray grid is an important parameter of the grid. The main parameters of the X-ray grid usually include: X-ray grid size, grid ratio, grid density, and focal length. X-ray grid is a photography term that refers to a method used to filter out the influence of scattered rays on the film.
The X-ray grid should be placed between the human body and the film to filter out most of the scattered rays, and only a small part of the scattered rays will leak.
X-ray grid classification:
1 Convergence grid: each lead bar is inclined to the focus, that is, the extension line of the lead bar is concentrated on the focus
2Parallel 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

Author：Lillian