What term is used to describe a grainy or mottled image in radiology?

The term that describes a grainy or mottled image in radiology is quantum mottle. Quantum mottle refers to the statistical fluctuation in the number of x-ray photons that hit the imaging detector during an exposure. This effect typically occurs when there is insufficient exposure to produce a uniform image, leading to a visual representation that appears grainy or uneven.

In digital radiography, quantum mottle can become more pronounced in situations with low radiation dose or poor image acquisition techniques. The presence of quantum mottle impacts the diagnostic quality of the image, as the noise can obscure fine details necessary for accurate interpretation. Thus, to minimize quantum mottle, adequate exposure settings should be used to achieve a clear image while adhering to the principles of radiation safety.