Which type of calibration helps ensure consistent performance in DXA systems?

Fixed calibration is essential for ensuring consistent performance in dual-energy X-ray absorptiometry (DXA) systems. This calibration method establishes and maintains a specific standard against which all measurements can be compared. By using fixed calibration, the system operates with the same parameters and reference points, which minimizes variability in bone density measurements over time.

This type of calibration typically involves periodic checks and adjustments based on stable reference materials that are known to have consistent properties. This process is crucial because it helps to ensure that any changes in data are due to actual physiological differences rather than fluctuations in the equipment's performance.

In contrast, other calibration methods may not provide the same level of consistency. General calibration can encompass a range of adjustments but doesn't focus specifically on maintaining fixed parameters. Dynamic calibration involves adjustments based on real-time changes, which can lead to variability. Standby calibration is typically used when the system is not in active use and isn’t focused on maintaining measurement consistency during actual testing. Hence, fixed calibration is the most reliable option for ensuring ongoing accurate assessments in DXA systems.