What is a significant drawback when using a crossed grid?

The significant drawback of using a crossed grid is that it can lead to grid cut-off when angling. A crossed grid consists of two linear grids that are oriented perpendicular to each other, which effectively enhances the removal of scatter radiation in both directions. However, this design also means that if a technologist angles the X-ray tube or the part being imaged, there is a risk of misalignment with the grid lines. This misalignment can cause a portion of the image to be underexposed or completely cut off, which compromises the overall image quality because the X-ray photons do not pass through the grid correctly. Therefore, while crossed grids provide excellent scatter rejection under certain conditions, this potential for grid cut-off when angling can be quite significant and is an important consideration in imaging technique.