The influence of tissue depth and composition on the performance of the Lunar dual-energy X-ray absorptiometer whole-body scanning mode

Article Abstract:

A simple phantom consisting of known but variable values of lard (representing fat) and water (representing fat-free tissue), and constant bone mineral content was used to test the accuracy of the Lunar dual-energy x-ray absorptiometer whole body scanning mode. Bone mineral density decreased with increasing depths of water. There was excellent precision for all measurements but this decreased with increasing depths of tissue. These results suggest that bone mineral measurements are depth-dependent and could give inaccurate measurements of bone mineral density in obese individuals.

Absorption of light, Light absorption

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A multi-center comparison of dual energy x-ray absorptiometers: in vivo and in vitro soft tissue measurement

Article Abstract:

In vivo and in vitro soft tissue measurements were evaluated using the dual energy x-ray absorptiometers (DXA). Findings revealed that similar DXA instruments may give significant intra-site and inter-site differences in soft tissue calculations with phantoms and humans. Uniform and accurate cross-calibration procedures are necessary for measuring soft tissue by DXA. Whole-body phantoms can be utilized for multi-center comparison studies.

Body composition, Densitometry

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Body composition unaltered for African women classified as 'normal but vulnerable' by body mass index and mid-upper-arm-circumference criteria

Article Abstract:

A new study of African women tests the theory that 'normal but vulnerable' adults, defined by a combination of mid-upper-arm-circumference and body mass index, are 'thin but healthy' at all ages, rather than malnourished.

United States, Health aspects, Evaluation, Physiological aspects, Leanness, Body mass index, Malnutrition, African American women

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