What is the difference between movable and fixed grid?

The filter grid is divided into two types: movable type and fixed type. The fixed type of grid can be directly used for X-ray photography.

When used, the filter grid is placed between the human body and the cassette to achieve the purpose of filtering out the scattered lines. The feature is that it is easy to use and has a simple structure, but when the grid density is too small, a lead strip effect is diagnosed. Movable filter grid: Starts moving in the direction perpendicular to the lead strip before starting exposure. It is known that the exposure stops after the end of exposure, which solves the phenomenon that the fixed grid has a lead shadow due to the small grid density.

Author：Alina