|
DXA uses two different photon energies, or X-ray beams, to measure soft tissue and bone. Currently, it is the most widely used method to measure bone mineral density.
While scanning, DXA directs alternating X-ray energy from two separate sources towards bone at a set frequency. These two sources of X-ray energy transmit bone density through a filter onto a photon counter that is part of the DXA machine. The greater the bone density, the stronger the signal picked up by the photon counter.
|