Which would be considered a QC activity in PACS?

• A. Monitoring display device luminance and contrast consistency
• B. Patient appointment reminders
• C. Software licensing renewal
• D. Printing patient labels

Answer: (A)

In PACS, quality control focuses on keeping image display and processing reliable so that radiologists can interpret scans accurately. The most direct QC task is regularly measuring and adjusting how a display presents images—specifically its luminance and contrast—so that brightness and the ability to distinguish shades of gray stay consistent over time and across monitors. When a monitor’s luminance shifts or its contrast changes, subtle details in the image can become harder to see, which can affect diagnosis. Calibrating and monitoring these factors helps catch drift early and ensures the grayscale rendering remains trustworthy.

The other items relate to workflow and administration rather than image quality. Reminding patients about appointments, renewing software licenses, and printing patient labels are important operational activities, but they do not assess or maintain the quality and consistency of image display for diagnostic interpretation.