: MeSH: Absorptiometry, Photon

Diagnosis > Diagnostic Techniques and Procedures > Diagnostic Imaging > Radiography > Absorptiometry, Photon

Investigative Techniques > Chemistry Techniques, Analytical > Photometry > Densitometry > Absorptiometry, Photon

Absorptiometry, Photon

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A noninvasive method for assessing BODY COMPOSITION. It is based on the differential absorption of X-RAYS (or GAMMA RAYS) by different tissues such as bone, fat and other soft tissues. The source of (X-ray or gamma-ray) photon beam is generated either from radioisotopes such as GADOLINIUM 153, IODINE 125, or Americanium 241 which emit GAMMA RAYS in the appropriate range; or from an X-ray tube which produces X-RAYS in the desired range. It is primarily used for quantitating BONE MINERAL CONTENT, especially for the diagnosis of OSTEOPOROSIS, and also in measuring BONE MINERALIZATION. Measurement of the degree of darkening of X-ray film by means of a photocell which measures light transmission through the film.

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