Grid cutoff with oblique radiographic techniques.

Abstract

Many radiographic techniques involve tilting the x-ray tube so that the beam strikes the grid at an oblique angle. To avoid cutoff from focus-grid distance decentering, the focal spot of the x-ray tube should be positioned on the convergent line of the grid. If the focal length of the grid is used for the distance from the target to the center of the grid with oblique techniques, there is significant cutoff from focus-grid distance decentering.