What is the function of a grid in radiography?

In radiography, the grid serves a specific function to enhance image quality by selectively minimizing the amount of scattered radiation that reaches the imaging receptor. Scattered radiation occurs when primary X-ray beams interact with matter (such as tissue), altering their path and potentially leading to a decrease in image contrast and clarity. The grid is composed of parallel lead strips or materials that are arranged to allow primary X-rays, which contribute to the diagnostic image, to pass through while efficiently absorbing or blocking the scattered rays that do not contribute useful data. By reducing the amount of scattered radiation that reaches the imaging receptor, grids significantly improve the contrast and overall quality of the resultant images, making it easier to discern structures and anomalies within the body.

Other options do not accurately describe the primary purpose of grids in radiography. While grids interact with different types of radiation, their main design goal is to combat scatter rather than primary radiation, remnant radiation, or low energy radiation directed toward the patient.