What does the term 'quantum mottle' refer to in fluoroscopic imaging?

The term 'quantum mottle' specifically refers to a grainy appearance in fluoroscopic images that occurs due to the statistical nature of x-ray photon detection. When an insufficient number of photons hit the imaging receptor, it leads to variations in the density of the produced image. This is particularly noticeable in areas where fewer photons are present, resulting in a texture that resembles granularity or noise rather than a smooth image.

This phenomenon is often more pronounced in low radiation dose settings or with high-speed image receptors. Understanding quantum mottle is crucial as it can affect diagnostic clarity; hence imaging techniques often aim to find a balance between minimizing exposure and maintaining image quality.