What is the average radiation dose of a DXA scan?

• A. 5-10 uSv per scan
• B. 1-5 uSv per scan
• C. 0.01 mSv per scan
• D. 0.5-1 mSv per scan

Answer: (B)

The average radiation dose of a DXA scan typically ranges from 1 to 5 microsieverts (uSv) per scan, which makes this option the most accurate representation of the dose involved in a dual-energy X-ray absorptiometry procedure. This low dose is advantageous because it signifies that DXA is considered a safe imaging technique for measuring bone mineral density, and it is used widely in clinical practice without significant concern for radiation exposure.

When understanding the significance of the radiation dose in DXA scans, it is essential to recognize that the radiation levels are incredibly low compared to other imaging modalities like CT scans or X-rays. This low level of exposure contributes to the desirability of DXA as a screening tool for osteoporosis and assessment of fracture risk.

Other choices present measurements that are either too high or not reflective of the typical dose delivered during a DXA scan. For example, doses higher than 5 uSv per scan are not consistent with standard practice for DXA. Therefore, understanding the correct average range helps convey the safety standard associated with DXA procedures.