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Dual-energy X-ray absorptiometry (DXA, or DEXA [1]) is a means of measuring bone mineral density (BMD) with spectral imaging. Two X-ray beams, with different energy levels, are aimed at the patient's bones. When soft tissue absorption is subtracted, the bone mineral density (BMD) can be determined from the absorption of each beam by bone. Dual ...
A scanner used to measure bone density using dual energy X-ray absorptiometry. Bone density, or bone mineral density, is the amount of bone mineral in bone tissue.The concept is of mass of mineral per volume of bone (relating to density in the physics sense), although clinically it is measured by proxy according to optical density per square centimetre of bone surface upon imaging. [1]
bone density studies for osteoporosis assessment Dual X-ray absorptiometry and laser technique (DXL) in the area of bone density studies for osteoporosis assessment is an improvement to the DXA Technique , adding an exact laser measurement of the thickness of the region scanned.
The United States Preventive Services Task Force recommends osteoporosis screening for women with increased risk over 65 and states there is insufficient evidence to support screening men. [21] The main purpose of screening is to prevent fractures. Of note, USPSTF screening guidelines are for osteoporosis, not specifically osteopenia.
About 22 million women and 5.5 million men in the European Union had osteoporosis in 2010. [15] In the United States in 2010, about 8 million women and between 1 and 2 million men had osteoporosis. [13] [16] White and Asian people are at greater risk. [3] The word "osteoporosis" is from the Greek terms for "porous bones". [17]
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Single photon absorptiometry is the first quantitative analysis method used in the diagnosis of osteoporosis. To evaluate bone quality, bone mineral content (BMC) and bone mineral density (BMD) are important indicators, and bone quality can reflect the health status of normal human bone tissue to a certain extent.
The trabecular bone score is a textural parameter that can be applied to DEXA, which quantifies the local variations in gray level. TBS is derived from the evaluation of the experimental variogram, obtained from the grayscale DEXA. [citation needed] It was found that TBS is a reflection of the structural condition of the bone microarchitecture.