American Registry of Radiologic Technologists (ARRT) Practice Exam

The correct answer highlights that a grid helps to produce less scatter fog in imaging.

Grids are designed to improve image quality by reducing the amount of scatter radiation that reaches the imaging receptor. When X-rays pass through a patient's body, some of them are scattered in various directions due to interactions with tissues. This scattered radiation can fog the image, leading to a decrease in contrast and clarity.

By employing a grid, which consists of a series of lead strips separated by a radiolucent material, the device selectively allows the unscattered primary X-rays to pass through while absorbing much of the scattered radiation. Consequently, the grid helps to enhance image contrast, leading to clearer images with minimal scatter fog.

This is particularly valuable in examinations where detail is crucial, such as in imaging thicker sections of the body, where more scatter is likely to occur. Therefore, the grid effectively plays a significant role in improving the quality of the resultant images by reducing scatter fog.