Dual-energy X-ray absorptiometry scans have multiple applications in the medical field. Primarily, dual-energy X-ray absorptiometry (DXA) scans detect body compositions, precisely the fat composition of the body. Therefore, dual-energy X-ray absorptiometry is preferred because it is a very accurate method for such detections, although it is costly. Dual-energy X-ray absorptiometry also generates “fat shadows,†which show the distribution of fat across the body. Thus, while giving the final result, the dual-energy X-ray absorptiometry automatically deducts the fat and amount of X-ray beams absorbed by soft tissues. Apart from osteoporosis, dual-energy X-ray absorptiometry can also detect abnormal fat distributions and related diseases such as familial partial lipodystrophy. In addition, it is also valuable for detecting the distribution of adipose tissues in children.
Only professionals with high skill levels must operate the dual-energy X-ray absorptiometry during the procedure because although the dose is small, 0.001 millisieverts, the radiation is of radioisotopes. If an older radiation source gets used, the radiation given could be very high, up to 35milligray. Women who are premenopausal or above the age of 60 years should get a dual-energy X-ray absorptiometry scan. Men can opt for a dual-energy X-ray absorptiometry scan once they reach the age of 70 years.
During the procedure of dual-energy X-ray absorptiometry, the bones and soft tissues get exposed to X-Ray. Both soft tissues and bones absorb X-rays. However, while calculating dual-energy X-ray absorptiometry results, the amount of X-ray absorbed by soft tissues is deducted from dual-energy X-ray absorptiometry measurement. Therefore, it is difficult to determine the bone mineral density by a single beam of X-ray. However, X-rays contain two different energies. The energies get absorbed by soft tissues and bones. Thus to measure the bone mineral density, the soft tissue absorption of these two different energies gets deducted from the total absorption. The final result is bone density.
Cerium filter and samarium filter are the two different types of filters used with tube voltages in a dual-energy X-ray absorptiometry scanner. For example, a tube voltage of 80 kilovoltage needs a cerium filter, whereas a tube voltage of 100 kilovoltage uses a samarium filter. In addition, dual-energy X-ray absorptiometry is often combined with laser since laser helps detect the thickness of the bones and the thickness of the adipose tissues.
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