Dual Energy X-Ray Absorpitometry (DEXA)
The latest technology used in the assessment of body composition. This method measures bone mineral density, lean mass and fat mass, through the use of two x-ray beams which traverse the body. The energy is then collected by a detector after it has been attenuated by the bone and soft tissue through which it has passed. The number of photons per unit of area is corrected for soft tissue by linear, two dimensional interpolation. The values are then summed to estimate total bone mineral content. Soft tissue is resolved by using mass attenuation coefficients from tissue equivalent standards for fat and fat free mass. DEXA is considered the NEW standard in the measurement of body composition.