What term describes the unsharp edges of tiny details on a radiographic image?

The term that describes the unsharp edges of tiny details on a radiographic image is "blur." In radiography, blur occurs when there is a lack of sharpness at the boundaries of structures within the image, which can be attributed to several factors including motion, the inherent resolution of the imaging system, or the geometric properties of the X-ray beam. This phenomenon affects how well-defined the edges of structures are and is crucial for interpreting fine details.

In imaging contexts, understanding blur is essential because it can impact diagnostic accuracy. Reducing blur helps in achieving clearer images, thus enhancing the visibility of critical anatomical details. In contrast, while terms like diffusion, mottle, and umbra have specific meanings in imaging and physics, they do not specifically refer to the unsharp edges characteristic of blur in the same way that the term blur does.