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The x ray grid is a very important component on the X-ray machine

The x ray grid is mainly used to filter out the influence of scattered rays on the film or image.It should be placed between the human body and the film, and most of the scattered rays can be filtered out, and only a small part of the scattered rays can pass through.


The appearance of the x ray grid is a flat plate with a thickness of 4~8MM. The internal structure is made of many thin lead bars arranged in focus. The two lead bars are filled with X-ray permeable material for positioning and bonding together. The filler can be wood, paper or aluminum sheet. Finally, the top and bottom are encapsulated with a thin aluminum plate or carbon fiber panel to form a filter grid. Seen from the cross section, the arrangement direction of the lead bars of the filter plate will all converge to a point. From the whole x ray grid, there is a convergence line

specification parameter:

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

2. Grid ratio: also called grid ratio, which is the ratio of lead bar height to lead bar gap

3. Grid density: the number of lead bars per unit distance, N

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