What term describes a radiographic image that has a mark due to contamination by water, blood, saliva, or chemicals?

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

Answer: (A)

An artifact is any distortion on a radiograph that does not represent the true anatomy. When the receptor or processing steps become contaminated by water, blood, saliva, or chemicals, those substances leave marks on the image. These marks arise from external factors and thus are described as artifacts. Fog refers to a general loss of contrast from scatter or processing issues, not a localized mark; noise is random variation in brightness, not a specific contaminant-caused mark. Contamination describes the offending material itself, not the image feature, so the image with contamination-caused marks is best described as containing an artifact.