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J Appl Physiol 82: 1200-1209, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 4, pp. 1200-1209, April 1997
METABOLISM

Body composition analysis by DEXA by using dynamically changing samarium filtration

Anders Gotfredsen, Lene Bæksgaard, and And Jannik Hilsted

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

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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