Which two methods can be effective in controlling scatter radiation?

Using grids and reducing mAs are effective methods in controlling scatter radiation. Grids are designed to absorb scattered photons that are produced during the radiation process. By placing a grid in the beam path, only the primary radiation that travels straight through the grid is allowed to reach the image receptor, while unwanted scatter is attenuated. This is crucial for improving image quality by enhancing contrast and reducing haze that can obscure important details.

Reducing mAs (milliampere-seconds) decreases the overall quantity of radiation produced, which can lead to less scatter generation. When less radiation is created, there is inherently less opportunity for scatter to occur, which further contributes to clearer images.

The other methods mentioned, while they may influence image quality in various ways, do not specifically target scatter radiation control as effectively as combining the use of grids with a reduction of mAs.