What is a primary purpose of using grids in an X-ray system?

Using grids in an X-ray system primarily serves the purpose of improving image contrast. Grids are designed to absorb scattered radiation that occurs as X-rays pass through the patient's body. This scatter can lead to a decrease in the overall image quality by producing a foggy appearance on the X-ray film or receptor, which makes it more difficult to distinguish between different tissues.

By using a grid, the amount of scatter radiation reaching the detector is significantly reduced, thus enhancing the visibility of the structures of interest within the image. This results in a clearer and more detailed image, allowing for better diagnosis and assessment.

While minimizing exposure time and enhancing image brightness can relate to overall image quality, they are not the primary functions of the grid. Additionally, increasing patient dose is not a goal of using grids; rather, the intent is to optimize image quality while balancing radiation exposure.