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2.2 Procedures involving ionising radiation include: Diagnostic X-rays, CT scans or DXA scans Radiotherapy (including brachytherapy and therapy using unsealed sources) Radionuclide imaging (including diagnostic imaging and in vitro measurements).
Dual energy X-ray absorptiometry, or DXA, is the most common method to measure a patient's BMD. DXA, or densitometry, is relatively easy to perform and the amount of radiation exposure is low. A DXA scanner is a machine that produces two X-ray beams, each with different energy levels. One beam is high energy while the other is low energy.