What is the function of the filter grating on the chest X-ray rack?

What is a filter grille? What is the function of the filter grating on the bucky stand? Is the filter grating necessary?
The filter grating is mainly used to filter the scattered rays. The filter grating on the chest X-ray rack. The filter grating is used for chest film rack, which is placed in front of the camera rack. It absorbs and filters the scattered rays irradiated on the chest film rack to improve the contrast of X-ray image and make the photographed image clearer. The filter grating is composed of lead strips absorbed by X-ray and permeable X-ray materials arranged according to a certain format. The orientation of the vertical arrangement of lead strips in the filter grating is the grating shape of the filter grating. According to geometric classification, filter grating can be divided into parallel grating and focusing grating. There are many kinds of chest film racks, some can place filter grating, some can not place filter grating, for example, DR special chest film rack can not place filter grating, after using DR, image clarity can achieve satisfactory results, there is no need to use filter grating on the chest X-ray rack.