The cutoff characteristics of rotating grids.
The cutoff characteristics of rotating grids are qualitatively and quantitatively different from those of comparable stationary grids. Rotating grids focus to a point in space so lateral decentering occurs in all directions from the central axis of the grid. Consequently, they cannot be used for oblique radiographic techniques. For any type or amount of decentering, cutoff is approximately one-third less for rotating grids.
Angiography↗