DXA is based on measuring the attenuation of a beam of X-rays when it passes through bone. Click here to find out more about the principles behind the DXA process.
Most instruments occupy an area the size of a single bed and may therefore be used in standard size consulting rooms. DXA machines produce a computer generated image as well as a table of values. Some typical results are shown in Figures 13a and 13b.
Exposure to ionising radiation is minimal (a single scan equates to about a day on holiday in Cornwall and the machine doesnt require additional protection for staff and patients).