Which of the following contributes to quantum mottle in imaging?

Quantum mottle is an effect seen in radiographic imaging resulting from insufficient x-ray photons reaching the detector. When the x-ray dose to the detector is low, it results in fewer photons being available to form the image, which can cause a grainy or mottled appearance. This happens because the statistical fluctuation in the number of detected photons leads to a variation in the image density, creating an inconsistent and noisy representation of the anatomical structures.

On the other hand, high radiation doses, efficient film processing, and high-quality film grain are factors that do not contribute to quantum mottle. A high radiation dose would typically improve the uniformity and quality of the image by providing a greater number of photons for detection. Efficient film processing enhances image quality by ensuring that the film adequately captures and displays the x-rays, while high-quality film grain results in clearer imaging with less interference from graininess. All of these factors can help reduce the likelihood of quantum mottle instead of contributing to it.