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

• A. Preventive maintenance
• B. Calibration checks
• C. Patient feedback
• D. End-user surveys

Answer: (A)

Preventive maintenance is the main tool for quality control because it uses a proactive, scheduled approach to keep the daylight system operating within specification. These systems have moving parts, light seals, film handling components, and control electronics that can wear, drift, or degrade over time. Regular maintenance tasks—inspecting for wear or misalignment, cleaning, lubricating, verifying seals to prevent light leaks, checking film transport, and following the manufacturer’s recommended tests—catch problems before they affect image quality or cause unexpected downtime. Calibration checks are important and often part of the maintenance routine, but the broader preventive maintenance program is what sustains consistent performance over time. Patient feedback and end-user surveys measure satisfaction rather than actively ensuring the system’s technical accuracy, so they’re not the primary QC tool.