Which of the following describes the two types of DXA calibrations?

The two types of DXA (Dual-energy X-ray Absorptiometry) calibrations are best described as empirical and fixed. Empirical calibration involves using data collected from individual scans to adjust and optimize the measurement system according to the specific characteristics of the equipment and the patient population being studied. This method relies on real-world data to ensure the accuracy and reliability of the bone density measurements provided by the DXA machine.

On the other hand, fixed calibration applies standard values or settings that are established based on validated reference data. This type of calibration does not change based on the specific conditions of the individual scan but rather uses pre-determined values to provide a consistent measurement framework.

Understanding these calibration types is crucial for interpreting DXA results accurately, as they influence how data is scaled and analyzed. This distinction enables practitioners to choose the appropriate calibration method for their specific clinical or research settings, ensuring high-quality bone density assessment.