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Dual-energy X-ray absorptiometry is the most widely used and most thoroughly studied bone density measurement technology. The DXA scan is typically used to diagnose and follow osteoporosis , as contrasted to the nuclear bone scan , which is sensitive to certain metabolic diseases of bones in which bones are trying to heal from infections ...
The improvement to DXA with DXL is that, for each pixel scanned by DXA, the exact thickness of the measured object is also measured using lasers. The DXL results allow for a more accurate estimation of bone density by using three separate inputs (low and high x-ray energies plus thickness) rather than two for each pixel in the measuring region.
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 thickness multiplied by the density of hydroxyapatite is bone density (g/cm 2). Single photon absorption is the most commonly used method to measure the distal and middle radius of the non-dominant upper extremity, or the distal radius of the radius of the distal 1/10, the ultra-distal radius and calcaneus, hand bone and so on.
Bone density is often expressed in grams per square centimeter (g·cm −2) as measured by x-ray absorptiometry, as a proxy for the actual density. The body mass index is expressed in units of kilograms per square meter, though the area figure is nominal, being the square of the height.
The stress–strain index (SSI), of a bone, is a surrogate measure of bone strength [1] determined from a cross-sectional scan by QCT or pQCT (radiological scan).The stress–strain index is used to compare the structural parameters determined by analysis of QCT/pQCT cross-sectional scans to the results of three-point bending test.
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"Census Figures by Wards - Islands Region". www.nso.gov.pg. 2011 National Population and Housing Census: Ward Population Profile. Port Moresby: National Statistical Office, Papua New Guinea. 2014. "Census Figures by Wards - Momase Region". www.nso.gov.pg. 2011 National Population and Housing Census: Ward Population Profile. Port Moresby ...