What is a consequence of using a low grid ratio?

Using a low grid ratio generally leads to reduced image sharpness. Grids are designed to improve image quality by reducing the amount of scattered radiation that reaches the imaging receptor, which can obscure detail and contrast. A lower grid ratio means that the grid is less effective at filtering out scatter, allowing more scattered photons to reach the image receptor. This results in a fuzzier image, thus diminishing sharpness.

In contrast, higher grid ratios are more effective at controlling scatter and enhancing image quality. Other answers reflect outcomes that are not associated with a low grid ratio. For instance, using a low grid ratio would not increase patient dose significantly, nor would it lead to better scatter control or provide higher image contrast, which are typically the benefits of employing a high grid ratio.