A portable radiograph is taken of a thick body part using a 10:1 stationary grid. The image produced demonstrates a contrast factor (K) of 1.7 . A second radiograph is taken with a different grid of unknown specifications, and the K-value is 2.2. What conclusion can you reach regarding the two grids?

What will be an ideal response?

The second grid is most likely a higher ratio grid as the change in contrast is greater. A greater K-value indicates greater contrast improvement which is related to grid ratio, grid frequency, and lead content of the grid.