Osteoporosis Health Center
DEXA Scan (Dual X-ray Absorptiometry)
How is bone mineral density measured?
Dual X-ray absorptiometry (DXA) is the preferred technique for measuring bone mineral density (BMD). DXA has also been called dual energy X-ray absorptiometry, or DEXA. DXA is relatively easy to perform and the amount of radiation exposure is low. A DXA scanner is a machine that produces 2 X-ray beams, each with different energy levels. One beam is high energy while the other is low energy. The amount of X-rays that pass through the bone is measured for each beam. This will vary depending on the thickness of the bone. Based on the difference between the two beams, the bone density can be measured.
At present, DXA scanning focuses on two main areas -- the hip and spine. Although osteoporosis involves the whole body, measurements of BMD at one site can be predictive of fractures at other sites. Scanning generally takes 10 to 20 minutes to complete and is painless.
Preventing Spinal Compression Fractures
To prevent future spinal compression fractures, it's also important to treat the osteoporosis that likely caused your fracture and begin building stronger bones. Natural ways to prevent spinal compression fractures include taking calcium supplements, getting more vitamin D, and doing weight-bearing and strength-building exercises. You can also take medications to halt or slow osteoporosis, including: Bisphosphonate drugs (Actonel, Boniva, Fosamax), which can slow bone loss, improve bone...
Read the Preventing Spinal Compression Fractures article > >
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