What effect does quantum noise/mottle have on an image?

Quantum noise, often referred to as mottle in imaging, primarily manifests as a grainy or speckled appearance in the final image. This phenomenon arises due to the statistical nature of photon detection; essentially, when there are insufficient photons reaching the detector, the result is an image that can be significantly compromised in quality. The inconsistency in photon absorption leads to variability in the image, which creates a reduction in overall image uniformity and clarity.

In the context of radiologic imaging, more quantum noise can result from lower radiation doses or insufficient tube current, particularly when imaging larger areas or patients with higher body mass. This graininess can obscure important details, making it more difficult for clinicians to interpret the images accurately. Thus, the increased perceptibility of quantum noise indicates the presence of mottle in the image.

In summary, the characteristic that quantum noise introduces is the grainy texture, impacting the overall diagnostic quality of the image.