Why should radiographs be taken before contrast studies?

• A. To warm up the equipment
• B. To check patient positioning
• C. To compare and to ensure exposure factors are correct
• D. To avoid delaying treatment

Answer: (C)

Taking radiographs before contrast gives a baseline image to reference technique and anatomy for the study. This allows you to tailor the exposure factors (like kVp and mAs) to the patient and area, and then compare post-contrast images to ensure they’re properly exposed and positioned. With a pre-contrast image, you can attribute any changes seen after contrast to the contrast itself rather than to different exposure or positioning, improving accuracy in assessing enhancement or filling. It also helps spot any existing issues or artifacts that could affect interpretation of the contrast study. The other options aren’t the primary reason: warming the equipment isn’t relevant, proper positioning is important but is addressed by obtaining good baseline images, and delaying treatment isn’t the goal of imaging.