What is the working principle of the grid?

The x ray grid is a device that passes the original emission line and filters out the scattered lines to improve the image quality. The definitions of the original emission line and the secondary ray are the original emission line and the primary ray and the radiation emitted from the X-ray tube, and the scattered line and the secondary ray and the original emission line are injected into the human body to have a special effect on the human tissue. The generated wavelength is longer than the original emission line and the radiation direction is disordered. Due to the different radiation direction of the scattered rays, the image appears to be blurred, and the gray-white contrast is not high, and the quality of the image is generated.

The original emission line passes through the gap between the lead bars inside the grid, and the scattered scattered lines are mostly blocked by the grid lead strips (the strip shape is a lead strip, and the blank area is the gap between adjacent grids) The grid is placed between the human body and the cassette, so the original emission line can reach the cassette through the gap between the lead strips of the grid and most of the scattered lines are blocked by the grid and cannot be irradiated onto the cassette.

Author：Alina