| A two-component method that describes the theory of x-ray transmission through an anti-scatter grid(hereafter called "grid")was developed in this study. With this method, the transmission of scattered radiation is divided into two components, space and lead transmission. Space and lead transmission mean the transmission of scattered radiation through inter-space material and lead foil, respectively. The transmission of scattered radiation through the grid was analyzed with these two components. The results indicated the following: (1)space transmission was inversely proportional to the grid ratio, and hardly depended on x-ray tube voltage;(2)lead transmission was almost the same as the transmission of scattered radiation through uniform lead foil with a thickness corresponding to the lead content of the grid, and strongly depended on x-ray tube voltage. The performance of all kinds of grids can be easily evaluated by our method using only the space transmission of a certain grid ratio, transmission of scattered radiation through a uniform lead foil, and transmission of primary radiation through inter-space material. |
