What is the Origin of DXA Scan?

The name DXA is an acronym for the core technology, Dual-Energy X-ray Absorptiometry, which precisely describes the physical principle utilized. The method relies on the differential absorption of two distinct X-ray energy beams by soft tissue and bone, allowing for accurate subtraction and isolation of the bone density measurement. This technology evolved from earlier single-photon absorptiometry techniques to become the clinically preferred standard for bone health assessment.

What is the Mechanism of DXA Scan?

The DXA device passes two distinct X-ray beams, one high-energy and one low-energy, through the body area being examined. The detector measures how much of each beam is absorbed by the tissue. Since bone and soft tissue absorb the two energies differently, the computer can mathematically subtract the soft tissue absorption from the total to determine the BMD. This sophisticated subtraction technique is what enables the accurate quantification of bone density and the detailed mapping of fat and lean mass compartments throughout the body.

DXA Scan

Meaning

A DXA Scan, which is an acronym for Dual-Energy X-ray Absorptiometry, is a non-invasive, low-radiation imaging technology used clinically to measure bone mineral density (BMD) and body composition with high precision. This procedure is the gold standard for diagnosing osteoporosis and assessing fracture risk by providing quantitative T-scores and Z-scores for the lumbar spine, hip, and sometimes the forearm. Beyond bone health, advanced DXA scans are also used in metabolic health to quantify lean muscle mass and adipose tissue distribution.

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