Which term refers to an image error caused by contamination such as water or saliva?

• A. Contamination
• B. Artifact
• C. Noise
• D. Fog

Answer: (A)

In dental radiography, the term for an unintended imperfection on the image is an artifact. When contamination such as water or saliva is present on the film, plate, or in the imaging pathway, it creates marks or streaks that do not correspond to the actual teeth or tissues. Those irregularities are classified as artifacts because they arise from foreign material affecting image formation, not from the anatomy itself.

Contamination identifies the source of the problem, but the image error itself is still an artifact. Fog refers to a general loss of contrast from scatter or chemical fog, and noise describes random variations in image density, not specifically caused by contamination. So the best label for the image error is artifact.