DXA is most commonly used bone densitometry method.

DXA is most commonly used bone densitometry method.

• A. Quantitative ultrasound
• B. Magnetic resonance imaging
• C. Computed tomography
• D. Dual-energy X-ray Absorptiometry (DXA)

Answer: (D)

Dual-energy X-ray absorptiometry (DXA) is the most commonly used bone densitometry method because it provides precise, reproducible measurements of bone mineral density at the sites most affected by osteoporosis, with very low radiation and rapid scan times. DXA uses two X-ray energies to separate bone from surrounding soft tissue, giving an accurate BMD value in g/cm^2. This precision allows standardized scoring (T-score and Z-score) that guides diagnosis and helps predict fracture risk per widely adopted criteria. Its broad availability, cost-effectiveness, and proven track record for monitoring changes in density over time make it the go-to method in routine clinical practice. Other modalities either measure only at limited sites with more variability (quantitative ultrasound), do not routinely quantify BMD (MRI), or involve higher radiation and less standardization for densitometry (CT), so they are not the standard choice for routine bone density assessment.

Dual-energy X-ray absorptiometry (DXA) is the most commonly used bone densitometry method because it provides precise, reproducible measurements of bone mineral density at the sites most affected by osteoporosis, with very low radiation and rapid scan times. DXA uses two X-ray energies to separate bone from surrounding soft tissue, giving an accurate BMD value in g/cm^2. This precision allows standardized scoring (T-score and Z-score) that guides diagnosis and helps predict fracture risk per widely adopted criteria. Its broad availability, cost-effectiveness, and proven track record for monitoring changes in density over time make it the go-to method in routine clinical practice. Other modalities either measure only at limited sites with more variability (quantitative ultrasound), do not routinely quantify BMD (MRI), or involve higher radiation and less standardization for densitometry (CT), so they are not the standard choice for routine bone density assessment.