What is the major tool of quality control for daylight systems?

• A. Preventive maintenance
• B. Calibration with test patterns
• C. Dosimetry checks
• D. Visual inspection

Answer: (A)

Preventive maintenance serves as the backbone of quality control for daylight systems because it keeps the equipment reliably functioning before problems appear. By regularly inspecting, cleaning, lubricating moving parts, replacing worn components, and verifying light seals, film paths, and lamp output, you prevent small wear or drift from escalating into jams, light leaks, or inconsistent film exposure. This proactive approach maintains consistent performance, reduces unexpected downtime, and protects image quality over time.

Other QC activities still matter, but they complement preventive maintenance rather than replace it. Calibration with test patterns confirms system performance after maintenance, visual inspection can catch obvious issues but may miss hidden wear, and dosimetry checks relate to patient dose in radiography rather than the operation of a daylight loading system.