Which QC parameters should be tested annually?

• A. 1 and 2
• B. 2 and 3
• C. 1 and 3
• D. 1, 2, and 3

Answer: (B)

Annual QC testing targets long-term stability and calibration drift in the imaging system. It’s about catching gradual changes that can accumulate over a year and affect dose or image quality, so you re-establish baselines and verify consistent performance over time. The second and third parameters fit this role because they assess calibration stability and system drift that naturally occur with continued use and aging components. The first parameter, by contrast, is typically a frequent, day-to-day or monthly check that ensures immediate consistency and safety; it is more sensitive to short-term variation and environmental factors, so it isn’t appropriate to rely on for annual re-baselining. Therefore, the set that should be tested annually is the second and third parameters.