ASRT Practice Exam 2025 – Complete Study Resource

The function of a grid in radiographic imaging is to reduce scatter radiation and improve image contrast. When X-rays pass through the body, some of them are scattered, which can cause a decrease in image quality or contrast. This scattering occurs when X-rays interact with tissues and structures within the body. A grid is a device made of alternating strips of radiopaque material (typically lead) and radiolucent material (like plastic or wood) that is positioned between the patient and the radiographic film or digital receptor.

By only allowing the primary X-rays that travel in a straight line to reach the imaging receptor, while absorbing some of the scattered radiation, the grid enhances the overall contrast of the radiographic image. This leads to clearer, more defined images that help in better diagnosis and interpretation.

In terms of patient dosage, comfort, and speed of imaging, these aspects are not functions of the grid. The grid's main purpose is focused on optimizing image quality by addressing scatter radiation, which directly correlates to improved diagnostic capabilities in radiology.