Also found in: Dictionary, Encyclopedia.
in radiology, the measurement of the degree to which the radiation emitted by a radioisotope is completely dissipated within a tissue.
dual energy absorptiometry (DEXA) an imaging technique that uses two low-dose x-ray beams with different levels of energy to produce a detailed image of body components; used primarily to measure bone mineral density.
dual photon absorptiometry measurement of bone mineral content in the axial skeleton, particularly the lumbar spine, by comparing transmission of the two separate photoelectric energy peaks emitted by gadolinium 153 through both soft and bone tissues.
Measurement of absorption, for example, of radiation.
A method of chemical analysis in which a sample of a substance is exposed to electromagnetic radiation, and the amount of radiation absorbed is measured to determine the chemical composition or concentration of the substance.
AbsorptiometryA technique used to assess bone mass, which measures the degree to which radiation emitted by a radioisotope is dissipated in a tissue.
Types Single photon absorptiometry, dual X-ray absorptiometry
A measure of the absorption of one thing by another, as in the use of x-rays as a means of measuring bone density.