All of the following are properties of x-ray imaging except which?

• A. Penetrating matter
• B. Producing a latent image in phosphors and film
• C. Fluorescing materials such as screen material
• D. Kilovoltage

Answer: (D)

The main idea is that certain features are intrinsic to how x-ray imaging works, while others are just settings used to produce the image. X-rays inherently penetrate matter, which is why they can pass through tissues and reach film or detectors. When film is exposed, a latent image is formed, meaning the energy is captured in a way that isn’t visible until processed. In screen-film or phosphor screen systems, the screens themselves are fluorescent materials that emit light when struck by x-rays, helping to transfer energy to the film or detector. Kilovoltage, however, is a machine setting that determines the energy of the x-ray beam and influences penetration and contrast, but it isn’t a property of the imaging process itself. So kilovoltage is not a property of x-ray imaging, making it the correct choice.