Which types of grids are commonly used in radiographic imaging?

In radiographic imaging, parallel and focused grids are the most commonly used types for reducing scattered radiation and improving image quality.

Parallel grids consist of radiopaque strips that run parallel to each other. They are simpler in design and are effective for certain imaging situations, especially when the distance from the grid to the X-ray tube remains constant.

Focused grids, on the other hand, are designed with strips of varying angulation. This allows them to better align with the divergent rays coming from the X-ray tube when used at specific distances, thus optimizing image quality by reducing scatter more effectively than parallel grids. They are particularly beneficial in situations where the X-ray beam is focused, as they help in capturing the intended anatomy without superimposing scatter.

The other types mentioned, such as curved, fixed, adjustable, eccentric, and concentric grids, are not standard or as widely used in typical radiographic practice due to their specific applications or designs which might not be suitable for general imaging needs. Therefore, parallel and focused grids are the predominant choices for radiographic imaging.