<unk>  <unk>  is a medical technique that measures bone mineral density (BMD) using a standard X-ray<unk><unk>  (CT) scanner with a calibration standard to convert Hounsfield Units (HU) of the CT image to bone mineral density values.<unk>  CT scans are primarily used to evaluate bone mineral density at the lumbar spine and hip. In general, solid phantoms placed in a pad under the patient during CT image acquisition are used for calibration. These phantoms contain materials that represent a number of different equivalent bone mineral densities. Usually either calcium hydroxyapatite (CaHAP) or potassium phosphate (K2HPO4) are used as the reference standard. Image of cortical and trabecular bone of the spine by<unk> . Only the central trabecular portion is measured
Quantitative computed tomography
Kinetic imaging
Dual-energy X-ray absorptiometry
Current density imaging
Single-photon emission computed tomography
Photon-counting computed tomography
Neutron imaging
Neutron stimulated emission computed tomography