How is spatial frequency related to pixel size?

Spatial frequency refers to the level of detail present in an image and is typically described in terms of cycles per unit of distance. Pixel size plays a crucial role in determining the spatial frequency that can be accurately represented in a digital image.

When pixel size decreases, the number of pixels that can fit within a given area increases, allowing finer details in the object being imaged to be captured more accurately. This results in a higher spatial frequency since more cycles of detail can be resolved within that area. Conversely, larger pixel sizes mean fewer pixels over the same area, which leads to a lower spatial frequency because less detail can be captured.

Thus, spatial frequency is inversely proportional to pixel size. As pixel size increases, the ability to capture higher spatial frequencies diminishes, and vice versa. Understanding this relationship is crucial for optimizing image quality in digital radiography, as it ensures that the resolution aligns with the diagnostic needs.