Which of the following is an advantage of DXA?

• A. High radiation exposure
• B. Long scan time
• C. High resolution
• D. Requires large amounts of tissue

Answer: (C)

The advantage of DXA, or Dual-Energy X-ray Absorptiometry, lies in its high resolution, which allows for precise measurements of bone mineral density (BMD). This capability is essential for accurately diagnosing osteoporosis and other bone-related conditions. High-resolution imaging contributes to the method's reliability in detecting changes in bone density over time, which is critical for monitoring patient progress and treatment efficacy.

In comparison, other methods or characteristics mentioned—such as high radiation exposure, long scan times, and the requirement for large amounts of tissue—do not align with the benefits of DXA. In fact, one of the strengths of DXA is its relatively low radiation exposure compared to other imaging modalities, its quick scan times that enhance patient throughput, and its ability to assess small regions of bone without needing large tissue samples. These features further reinforce DXA's role as a preferred choice in bone density assessments.