Contents
Why is DXA important?
Dual energy x ray absorptiometry (DXA) scans to measure bone mineral density (BMD) at the spine and hip have an important role in the evaluation of individuals at risk of osteoporosis, and in helping clinicians advise patients about the appropriate use of antifracture treatment.
Who invented DXA?
The bone density scan was invented by the late John R. Cameron (1922-2005), professor emeritus at the University of Wisconsin at Madison. He earned a PhD in physics. He invented bone densitometry in the late 1960s.
Why are DEXA scans used?
A bone density scan uses low dose X-rays to see how dense (or strong) your bones are. You may also hear it called a DEXA scan. Bone density scans are often used to diagnose or assess your risk of osteoporosis, a health condition that weakens bones and makes them more likely to break.
What does DXA stand for?
It uses very low levels of x-rays to measure how dense your bones are. DEXA stands for “dual-energy X-ray absorptiometry.” Medical experts consider DEXA scans to be the most useful, easy, and inexpensive test for helping to diagnose osteoporosis. The test is quick and painless.
How does a DXA work?
The DXA machine sends a thin, invisible beam of low-dose x-rays with two distinct energy peaks through the bones being examined. One peak is absorbed mainly by soft tissue and the other by bone. The soft tissue amount can be subtracted from the total and what remains is a patient’s bone mineral density.
Who needs DEXA scan?
Who should get a bone-density scan? For women over 65 and men over 70, DEXA scans are only appropriate for those with moderate risk of fracture or when the results will change the patients care plan. Younger women and men ages 50 to 69 should consider the test if they have risk factors for serious bone loss.
How does DXA scan work?
Is the dose of DXA comparable to natural background?
The limited data available confirms that patient doses from DXA are low. Even with the increase in dose associated with fan beam technology this remains so. It is comparable to a few days natural background and is generally similar to or less than dose from plain chest radiography.
Can a patient breastfeed after a DXA scan?
The patient may breastfeed as normal after the DXA scan. Once the DXA scan is over the patient is no longer being exposed to radiation, and does not pose a radiation risk to others. » Is it acceptable to perform a DXA scan on a patient as a part of a research study?
Are there any radiation protection devices for DXA?
No. There is no indication that protective devices should be used in DXA. These do not protect against internal scatter, which is the main source of radiation to organs outside the area of clinical interest.
What’s the average dose of radiation from a DXA scan?
The typical patient effective dose from a dual energy QCT examination is 50 – 100 μSv. Dose from dual energy QCT is higher than the effective dose from DXA scan.