A DEXA scan uses low-dose X-rays to measure bone density, typically focusing on the spine and hip, to evaluate bone health and detect conditions like osteoporosis.
A bone densitometer uses small amounts of X-rays to produce images of the spine, hip, or even the whole body. The X-rays are composed of two energy levels, which are absorbed differently by the bones in the body. This is why the technical term for the DEXA method is “dual-energy X-ray absorptiometry.” The computer analyzes the different absorption measurements of these two X-ray energy levels to determine the amount of bone mineral present. The spine and hip are usually measured because they are weight-bearing bones, and that is where osteoporotic fractures commonly occur.
Before your DEXA exam, we will enter your name, age, height, weight, and ethnicity into the computer to compare your results to a normal reference group. You will lie on your back during the procedure and remain in your normal clothing, although any metal objects such as belt buckles, jewelry, or thick plastic buttons will need to be removed from the area being examined.
The technologist will position your arms and legs to ensure accurate results. The procedure is quick, painless, and usually takes between one and ten minutes. During the exam, you will be asked to lie still and breathe normally. Screening questions may be asked to help the radiologist interpret the results accurately.
While DEXA scans use a small amount of radiation, it can still be harmful to certain areas of the body. At Advanced Radiology, we follow strict ALARA (As Low As Reasonably Achievable) radiation safety standards to minimize exposure.