What is the SID range for a low grid ratio of 5:1?

The appropriate source-to-image distance (SID) range for a low grid ratio of 5:1 is indeed 28-72 inches. This range is important for ensuring optimal image quality while minimizing patient exposure to radiation. A low grid ratio such as 5:1 is designed to improve image contrast by reducing scatter radiation that reaches the film or detector. However, to achieve the desired effect, the SID must be appropriately selected.

When using lower grid ratios, the SID can be more flexible, allowing for a broader range compared to higher grid ratios. A 5:1 grid ratio offers a good balance between maintaining image quality and accommodating variations in positioning. The 28-72 inch range allows for various clinical situations and patient sizes, ensuring that these factors can be accommodated without compromising the quality of the fluoroscopic images.

In contrast, the other available ranges either exceed or don't meet the typical requirements for utilizing a 5:1 grid ratio, leading to less effective imaging or potential increases in radiation dose. Therefore, the 28-72 inch SID range is well established for optimal performance with a low grid ratio, making it the appropriate choice in this case.