The parameters required for the purchase of x-ray fixed grids.

X-ray fixed grids are now largely eliminated by the market, replaced by mobile grids. The moving grid plate is a plate approximately 4-8 mm thick. The internal structure is composed of many thin lead bars arranged intersectionally. The two lead strips were filled and positioned with X-ray material and bonded together. Fillers can be wood, paper or aluminum sheets. Finally, the upper and lower parts are packaged with thin aluminium sheets to form a filter grating.

Focus: The vertical distance from the lead convergence line to the grid surface, f

Gate Ratio: It’s also grid ratio. It’s the ratio of height of lead bar to gap of lead bar, R.

Gate density: number of lead bars per unit distance, N

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Author：Yevette