Regardless of whether you are using DR, CR or cassettes, you need to put them on a vertical bucky stand for trial. In order to ensure image quality, X-ray grids are generally required.
So how to choose the X-ray grid?
The X-ray grid has a grid ratio, focal length, and grid density.
The focal length of the X-ray grid is the distance between the tube and the bottom of the grid, and the focal length of 180cm is usually selected for chest shots.
The grid density of the X-ray grid refers to the number of pairs per centimeter (or per inch), and there are usually 40, 50, 60 and other specifications.
The grid density of the X-ray grid refers to the ratio of the grid thickness to the grid spacing.
For high-dose X-rays, choose an X-ray grid with a high grid ratio. For those above 90KV, choose an X-ray grid above 10:1, and for those below 90KV, choose an X-ray grid below 8:1.
If the chest X-ray measurement is usually greater than 90KV X-ray grid, you can choose 10:1, 12:1, X-ray grid.
The greater the number of milliamperes used, the higher the grid density of the selected X-ray grid.
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