Which technique is considered the gold standard for measuring bone density?

• A. MRI
• B. DXA
• C. QCT
• D. Ultrasound

Answer: (B)

The technique widely recognized as the gold standard for measuring bone density is Dual-energy X-ray Absorptiometry (DXA). DXA operates by utilizing two different X-ray beams to estimate the density of bone tissue, which allows for precise measurement of bone mineral density (BMD). This method is favored due to its high sensitivity and accuracy in detecting changes in bone mass, making it particularly valuable for diagnosing conditions like osteoporosis and assessing fracture risk.

DXA is also relatively quick, non-invasive, and exposes patients to a minimal amount of radiation, which enhances its patient safety profile. Clinicians rely on DXA results to monitor the effectiveness of treatments for conditions affecting bone density, thereby allowing for informed clinical decisions regarding patient care.

Other modalities, while useful in specific contexts, do not match DXA's established efficacy and reliability within the realm of bone density assessment.