What is one purpose of using a grid in a simulation procedure?

Using a grid in a simulation procedure serves the important function of filtering out scattered radiation, which ultimately helps to improve image contrast. When x-rays pass through the body, some of them scatter due to interactions with tissues, leading to a reduction in image quality. The grid is positioned between the patient and the image receptor, effectively allowing only the primary rays that are perpendicular to the grid to reach the receptor. By absorbing the scattered radiation, the grid enhances the overall contrast of the image, which is crucial for accurate treatment planning in radiation therapy. Improved contrast helps clinicians better visualize the tissues and structures of interest, ensuring more precise and effective dosimetry. This function is vital in creating a high-quality simulation that accurately represents the anatomy, leading to better treatment outcomes.