Structure and characteristics of x ray grids

For linear x ray grids, all lead strips extend along the same direction.

A cross x ray grid is assembled by stacking two linear x ray grids. The lead strips of the upper linear x ray grid intersect perpendicularly with the lead strips of the lower linear x ray grid.

The grid ratio of a cross x ray grid equals the product of the grid ratios of its two stacked linear components.

For example, a cross x ray grid made of two 5:1 linear x ray grids can filter more scattered radiation than a single 10:1 linear x ray grid.

This performance advantage becomes more prominent when the operating voltage is under 100 KVP.