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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. Dual-energy X-ray absorptiometry (DXA, previously DEXA) is a means of measuring bone mineral density (BMD). Two X-ray beams, with different energy levels, are aimed at the patient's bones. When soft tissue absorption is subtracted out, the BMD can be determined from the absorption of each beam by bone.