How does fill factor relate to spatial resolution in digital radiography?

In digital radiography, the fill factor refers to the ratio of the sensitive area of a detector element (like the photodetector) to the total area of the detector element. A higher fill factor means that a greater portion of the detector is actively sensing incoming radiation, allowing for better capture of the information needed to form an image.

Spatial resolution, which describes the ability to distinguish small details in an image, is positively affected by a higher fill factor. When the fill factor is high, there is more sensitivity to the X-rays that hit the detector, leading to clearer images with finer detail. This directly enhances the spatial resolution because it allows the detector to better differentiate between close-together structures within the X-ray field.

Conversely, if the fill factor is low, there may be less information captured per unit area, resulting in reduced spatial resolution. This relationship highlights how crucial the fill factor is in optimizing digital radiographic images, directly impacting the details and clarity that can be achieved in diagnostic practices.