How to distinguish the front and back of the X-ray grid

How to distinguish the front and back of the X-ray grid
The grid should be placed between the human body and the film, which can filter out most of the scattered rays, and only a small part of the scattered rays leak.
The image is sharpened by filtering stray rays.
Many customers do not know how to place the grid, and how to distinguish the front and back of it?
The grid is generally labelled on the front, and the front is facing the X-ray tube. When transporting and storing the grid, pay attention to placing it horizontally or vertically, not tilted, not heavy, and handled with care. When transporting, it is packed in a wooden box, and it is punched to prevent bumping.
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Author：X Ray Grids Maker