"Noise" refers to the amount of information that is not useful in the radiographic image. This noise is referred to as:

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Quizplus · Accepted Answer

Quantum mottle is caused by insufficient photons reaching the image receptor, resulting in a grainy appearance and decreased image resolution. It is considered noise because it is not useful information in the radiographic image. Shuttering refers to the exposure time of the x-ray beam and is not directly related to image noise. Dynamic range refers to the ability of the imaging system to produce a wide range of image intensities, and SNR refers to the ratio of useful signal (image information) to background noise, but neither of these terms specifically describes the noise in the image.

"Noise" Refers to the Amount of Information That Is Not