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Dual-energy X-ray absorptiometry (DXA, or DEXA [1]) is a means of measuring bone mineral density (BMD) using spectral imaging. Two X-ray beams, with different energy levels, are aimed at the patient's bones. When soft tissue absorption is subtracted out, the bone mineral density (BMD) can be determined from the absorption of each beam by bone ...
DXA is only able to provide the areal bone mineral density. High-resolution peripheral quantitative computed tomography (HR-pQCT) is better than DXA at detecting bone microarchitecture, modeling whole-bone geometry using 3-dimensional information from scans. This method allows estimation of bone strength and other mechanical properties. [20]
To reduce soft-tissue errors in DXA, DXL technology was developed in the late 1990s by a team of Swedish researchers led by Prof. Ragnar Kullenberg. With DXL technology, the region of interest is scanned using low and high energy x-rays as with a DXA scan. The improvement to DXA with DXL is that, for each pixel scanned by DXA, the exact ...
Specific patient populations might benefit from specialized tests, like the DEXA body composition (i.e. women after menopause who typically lose bone density). Certain symptoms might prompt some ...
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.
The report from aides to Sen. Dick Durbin, an Illinois Democrat and chairman of the committee, says that the failure by conservative Justices Clarence Thomas and Samuel Alito to disclose lavish ...
Third, there is criminal liability where a vehicle manufacturer intentionally violates the new reporting requirements when a safety-related defect has subsequently caused death or serious bodily injury. There are a number of other smaller provisions which mostly address manufacturers of vehicle tires and guidance to the NHTSA on reporting data.
U.S. farm industry groups want President-elect Donald Trump to spare their sector from his promise of mass deportations, which could upend a food supply chain heavily dependent on immigrants in ...