How to choose a variety of grids

The wire grid is a device used to filter out the scattered rays so as to improve the image quality. It is located between the human body and the detector and can filter out most of the scattered rays, and only a small part of the scattered rays leak. The following is the classification of grids:
According to the structure, it can be divided into:
1. Convergence grid: each lead bar is inclined to the focal point and concentrated on the focal point.
2. Parallel grid: each lead bar is parallel to the vertical plane.
3. Crossing grid: It is composed of two parallel grids, and the guiding direction is 90 degrees.
4. Arc grid: the same radius from the center to the outside is superimposed, and it is flat.
According to the material, it can be divided into:
1. Ordinary grid: The inner gasket is a non-metallic material title, divided into wood, paper, plastic and other non-metallic low-density materials
2All metal grid: inner gasket is made of metal material: aluminum plate has high strength and good moisture resistance
structure:
The appearance of the grid is a grid with a thickness of 4 ~ 8mm. The internal structure is composed of many thin lead strips arranged in a concentrated manner. The filler can be wood, paper or aluminum. Finally, the upper and lower parts are packaged with thin aluminum plates to form grid plates. From this section, the layout direction of the filter plate leads will converge at one point, as seen from the entire grid plate, there is a convergence line.
parameter:
Focal length (F): The vertical distance from the convergent line of the lead to the surface of the grid plate.
Grid ratio (R): Also called grid ratio, it is the ratio of lead height to lead gap.
Grid density (N): the number of lead in a unit distance.
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Author：Lillian