Which two statements are true concerning a higher ratio grid compared to a lower ratio grid?

The statement that high ratio grids demonstrate increased efficiency, specifically in terms of contrast improvement, is accurate because high ratio grids are designed to better absorb scatter radiation while allowing more of the primary beam to reach the image receptor. This characteristic enhances image contrast, which is critical for producing clear and diagnostic-quality radiographs.

Higher ratio grids usually have a greater height of lead strips compared to lower ratio grids, which effectively reduces the amount of scatter radiation that reaches the film or digital detector. As scatter radiation can degrade the quality of an image by reducing contrast, the ability of a high ratio grid to minimize this scatter leads to improved visibility of anatomical structures and finer details, making it easier to differentiate between adjacent tissues.

While high ratio grids do require adjustments in exposure settings, such as an increase in milliampere-seconds (mAs), the focus here is on their efficiency at improving image contrast, which is a key advantage for diagnostic imaging.