What is the procedure for a DXA scan?

• A. The patient lies still on a table while a scanner passes over their body
• B. The patient stands while an X-ray machine captures images
• C. The patient is injected with a contrast agent before scanning
• D. The patient performs exercises while monitored by the machine

Answer: (A)

The procedure for a DXA (Dual-Energy X-ray Absorptiometry) scan involves the patient lying still on a table while a scanner passes over their body. This method allows for precise measurements of bone mineral density by utilizing two different energy levels of X-rays. The scanner emits X-rays, and and the varying degrees of absorption by bone and soft tissue are analyzed to evaluate bone density. This non-invasive technique is quick and typically painless, providing valuable information about an individual’s bone health.

In contrast, standing during a scan, the use of contrast agents, or performing exercises are not integral to the standard DXA procedure. Such activities could lead to motion artifacts or complicate the imaging process, potentially resulting in less accurate assessments of bone density. The key to a successful DXA scan is maintaining stillness, which ensures that the measurements taken are both reliable and valid.