The main function of the filter grating is to eliminate the influence of scattered rays on the film.

In the medical diagnosis work, the human chest is by the bone, the soft tissue and so on many kinds of density different tissue, therefore USES the chest fluoroscopy or the X-ray examination is the most common medical diagnosis, the simplest, most direct, most clear examination method.The quality of chest radiograph directly affects the rate of X-ray diagnosis.To improve the quality of pictures is one of the main factors inhibiting scattering X-ray, and the application of filter wire grid is scattering line before reaching the photos from the scatterer be rule out, is an effective device for direct absorption scattering line, its principle is to filter wire grid between the photos and body and X-ray tube of the center of the center line of alignment filter line grating, so out of the X-ray tube primary X-ray filter with the wire grid parallel strips together, part through the gaps lead to photograph, another part of the ray to lead and be absorbed, scattering emitted by test line, with the lead Angle and not through leaded clearance, so most were absorbed,Thus, the amount of scatterers is reduced, the contrast of photos is greatly improved, and the image quality is improved.

According to the structure classification, the filter grid can be divided into:
Convergence gate: each lead bar is inclined to the focus, that is, the lead bar extension line is focused at the focus
Parallel grid: each lead bar is parallel to each other in the vertical plane
3. Cross grid: it is composed of two parallel grids, and the direction of lead strips is 90° from each other
Arc grid: it is formed by overlapping the center outward with the same radius, tile sheet
According to the material can be divided into common filter grid and all metal filter grid.

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Author：肖恩