Which technology is commonly used in bone densitometry scans?

• A. CT Scan
• B. Ultrasound
• C. Dual-Energy X-ray Absorptiometry (DXA)
• D. Magnetic Resonance Imaging (MRI)

Answer: (C)

Dual-Energy X-ray Absorptiometry (DXA) is the standard technology used in bone densitometry scans. This method is specifically designed to measure bone mineral density (BMD) and is particularly effective for assessing bone health, diagnosing osteoporosis, and estimating fracture risk.

DXA works by passing two different energy X-ray beams through the bone and soft tissue. By measuring the absorption of these beams, the device can calculate the density of the bone. This technique offers high precision and accuracy with lower radiation exposure compared to other imaging modalities, making it ideal for routine screening and monitoring.

While CT scans can also assess bone density, they are more commonly used for detailed imaging of bone structures rather than routine densitometry. Ultrasound can provide information about bone quality but is not widely used for quantitative BMD measurement. Magnetic Resonance Imaging (MRI) is typically employed for soft tissue evaluation and detecting other conditions rather than bone density assessment. Therefore, DXA remains the preferred and commonly utilized technology in bone densitometry.