In semi-annual collimator light field and X-ray field alignment testing, which test devices are used?

• A. Both alignment template and 9 pennies image
• B. Alignment template
• C. 9 pennies image and tape measure
• D. None of the above

Answer: (A)

In this semiannual check, you want to ensure the light field actually matches the X-ray field and is centered on the image receptor. An alignment template provides a precise, calibrated reference with clear borders and center marks that you can compare against the light field. It shows if the light field edges line up with the template, revealing any misalignment in a controlled, repeatable way. The nine pennies image gives a radiographic visual pattern that you can image and inspect to confirm that the X-ray field covers the intended area and is centered relative to a known reference on film. Together, they offer both a precise setup reference and a practical image-based verification, which is why both are used. A tape measure alone wouldn’t show how the light and X-ray fields align on the actual radiograph, so it isn’t sufficient for this test.