How is a baseline value determined in Quality Control?

• A. Scan the phantom five times and calculate the average
• B. Scan the phantom 10 times and determine the range
• C. Scan the phantom 10 times and calculate the average
• D. Scan the phantom once and use that value

Answer: (C)

In the context of quality control for bone densitometry, establishing a baseline value is crucial for ensuring the accuracy and precision of the measurements obtained from the densitometer. Scanning the phantom multiple times, specifically ten times, is recommended to achieve a robust average value. This approach helps to minimize the impact of random variations or anomalies that may occur during individual scans.

By calculating the average from ten scans, the process provides a more reliable representation of the phantom's behavior under normal operating conditions. This method helps create a baseline that can be used for future comparisons when evaluating the performance of the densitometry equipment over time. It ensures that any deviations from this baseline can be detected and addressed promptly. This statistical approach enhances the quality assurance protocols necessary in clinical practice.