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Departments of Internal Medicine and Endocrinology, Copenhagen University Hospital, DK-2650 Hvidovre, Denmark
Received 15 May 1995; accepted in final form 13 November 1996.
Gotfredsen, Anders, Lene Bæksgaard, and Jannik Hilsted.
Body composition analysis by DEXA by using dynamically changing samarium filtration. J. Appl. Physiol.
82(4): 1200-1209, 1997.
Dual-energy X-ray absorptiometry (DEXA)
has a high accuracy for body composition analysis but is influenced by
beam hardening and other error sources in the extremes of measurement.
To compensate for beam hardening, the Norland XR-36 introduces a
dynamically changing samarium filtration system, which depends on the
current-absorber thickness. With this system we found a good agreement
(r = 0.99) between reference and
measured amounts of tissue or fat percentages in a plastic phantom and
in smaller (~0.5-4 kg) and larger (~5-20 kg) piles of
tissue (ox muscle and lard). Scans of six healthy volunteers covered
with combinations of beef and lard (~5-15 kg) showed a good
agreement (r = 0.99) between reference
and DEXA values of added soft tissue mass and fat percentage. We
conclude that the DEXA method (and, in particular, the Norland XR-36
using dynamic filtration) has a high accuracy for body composition
analysis. It has a potential for gaining status as a reference method
in the future and may presently be used as a supplement to the
traditional methods for body composition analysis.
body composition; dual-energy X-ray absorptiometry; dynamic samarium filtration; fat-free mass; fat mass
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