Grid in radiology specifications

Under what circumstances can the use of grid in radiology improve the quality of X-ray medical equipment? The function of grid in radiology is to filter scattered rays, reduce fog and improve contrast. In the case where the thickness and density of the object being photographed is relatively large, the use of a grid can improve the quality of the film. Grid in radiology is used for filming with high frequency machine, and the effect will be better. What are the important specifications of grid in radiology? What role do grid in radiology parameters play in it?
The main specifications of grid in radiology are grid density, grid ratio, and focal length. Grid density: the number of lead bars arranged per unit distance. The greater the grid density, the stronger the ability to absorb scattered rays. Grid ratio: the ratio of the height of the lead bar to the distance between the lead bars. The larger the grid ratio, the stronger the ability to filter out rays, and the stronger the ability to absorb scattered rays. At the same time, it will also increase the amount of original rays absorbed. Focal length: the vertical distance from the focal point (the point where the lead extension lines converge) to the center of the X-ray grid.
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Author：Lillian