Which QC parameters should be tested daily?

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

Answer: (D)

Daily QC focuses on the parameters that most directly affect dose and image appearance, and these can vary from day to day. Testing all three ensures immediate detection of any drift that could impact patient safety or diagnostic quality.

First, checking the kVp accuracy confirms the beam energy stays at the set value. If the voltage drifts, tissue penetration and image contrast can change, leading to under- or overexposure in ways that aren’t obvious without a check.

Second, verifying timer accuracy ensures the exposure time is correct for the chosen technique. With a given tube current, an incorrect timer changes the mAs delivered, which alters the image brightness and the radiation dose to the patient.

Third, assessing exposure reproducibility (consistency of exposure for repeated exams with the same technique) guarantees that repeated images are consistent in brightness and dose. Variability here means some patients could receive more or less radiation than intended, and images may not be comparable.

Because each parameter directly influences exposure and image quality and can drift independently, testing all three daily provides comprehensive monitoring and immediate assurance of safe, consistent performance.