The relationship of a grid's height to the thickness of the interspace material is referred to as the grid:

The relationship of a grid's height to the thickness of the interspace material is referred to as the grid ratio. This key concept is important in understanding how effectively a grid can reduce scatter radiation while allowing useful radiation to reach the image receptor. The grid ratio is calculated by dividing the height of the lead strips in the grid by the width of the interspace material. A higher grid ratio indicates that the grid is more efficient at blocking scatter radiation, which can enhance image quality in radiographic imaging.

This understanding is vital for radiologic technologists in deciding which grid to use based on the type of examination and the expected levels of scatter radiation, ultimately leading to better diagnostic images.