How can mottling due to diffraction be minimized in radiographic images?

Mottling due to diffraction in radiographic images can be minimized by raising the kilovoltage and using lead foil screens. Increasing the kilovoltage improves the penetrating power of the x-rays, reducing the impact of diffraction effects in the resulting image. Higher kilovoltage generates x-rays that are not as scattered, leading to a more uniform exposure across the radiographic film.

Using lead foil screens further enhances image quality by absorbing scattered radiation before it reaches the film. Lead foil screens are designed to improve contrast and reduce noise in the image, which effectively combats the mottling effect. Together, these adjustments lead to clearer, more accurate radiographic images with reduced mottling, making this option the most effective method for addressing diffraction-related issues in radiography.

Other options, such as reducing exposure time or increasing the distance from the source, do not directly address the issue of diffraction and may even have unintended consequences on image quality. Lowering the film speed would also likely reduce sensitivity and could result in increased exposure time, again potentially leading to more noise rather than resolving mottling.