Grid Ratio

Grid ratio is defined as the height of the lead strip compared to the distance between the strips.
Generally speaking, a grid with a higher grid ratio is more efficient than that with a low ratio. A high ratio requires, however, a higher exposure rate, since more radiation is absorbed by the grid. It is advisable to use grids with a higher ratio, when images of heavy objects and exposures at higher kV are made.

Grids are manufactured with the following ratios as standard:

Parallel and Focused N30 r 6, 8, 10

Parallel and Focused N40 r 6, 8, 10, 12

Parallel and Focused N70 r 6, 8, 10, 12, 16

Other ratios can be manufactured on special request.