What is the impact of using a grid on receptor exposure?

Using a grid in radiography primarily serves to improve image quality by reducing scattered radiation that can degrade the final image. While grids are effective at enhancing contrast by absorbing some of the scatter, they also have an important impact on receptor exposure.

When a grid is employed, it selectively allows only the primary (useful) radiation to pass through to the image receptor while absorbing some of the scattered rays. This absorption of scatter is beneficial for the overall quality of the image; however, it also means that fewer photons reach the receptor. Consequently, this results in a decrease in the overall exposure to the image receptor.

Grids are often necessary for certain imaging scenarios where scatter is prevalent, such as in larger body parts or during procedures requiring higher doses, but the trade-off must be understood: the use of grids will typically necessitate an increase in the overall exposure to compensate for the reduced receptor exposure due to scatter absorption. This adjustment ensures that the desired level of exposure is achieved for optimal imaging.