What is the purpose of using a grid in radiography?

The purpose of using a grid in radiography is primarily to eliminate scatter radiation. In radiographic imaging, scatter radiation occurs when x-rays interact with matter in a way that deviates from their original path. This scatter can degrade image quality by reducing contrast and obscuring fine details. A grid is an effective tool that consists of a series of thin lead strips placed between the patient and the imaging receptor. These strips are aligned to allow primary radiation (the useful information that forms the image) to pass through while absorbing a significant portion of the scatter radiation. As a result, the grid improves the clarity and contrast of the resulting images, leading to higher diagnostic accuracy.

In contrast, the other options do not accurately reflect the primary function of a grid. Increasing image exposure refers to adjusting the amount of radiation reaching the image receptor, which is not the focus of a grid's design. Enhancing the field of view generally relates to the imaging equipment and technique rather than the application of a grid. Increasing the focal spot size pertains to the characteristics of the x-ray tube and does not relate to the purpose of a grid in managing scatter radiation.