Which term refers to brightness fluctuations on the radiographic image?

The term that refers to brightness fluctuations on a radiographic image is quantum mottle. This phenomenon arises from the statistical nature of photon detection, where the random arrival of X-ray photons can create variations in the density of the film or digital image. In other words, quantum mottle results in a grainy appearance caused by insufficient X-ray photons reaching the detector, leading to areas of differing brightness that do not accurately represent the object being imaged.

Understanding quantum mottle is essential for radiologic technologists, as it highlights the importance of exposure factors in producing high-quality images. If the exposure is too low, the likelihood of detecting sufficient photons decreases, resulting in these brightness fluctuations. Optimizing exposure settings can help minimize quantum mottle and improve image quality in radiographic practice.