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Evaluation of DXA vs. MRI for body composition measures in 1‐month olds
Author(s) -
Fields D. A.,
Teague A. M.,
Short K. R.,
Chernausek S. D.
Publication year - 2015
Publication title -
pediatric obesity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.226
H-Index - 69
eISSN - 2047-6310
pISSN - 2047-6302
DOI - 10.1111/ijpo.12021
Subject(s) - medicine , trunk , dual energy x ray absorptiometry , fat mass , magnetic resonance imaging , composition (language) , dual energy , fat free mass , nuclear medicine , zoology , body mass index , radiology , bone mineral , biology , ecology , osteoporosis , linguistics , philosophy
Summary Background Detailed measures of infant body composition are needed for understanding the impact of genes and environment on growth early in life. Objective The purpose of this study was to compare the accuracy and bias of body composition in infants. Methods Dual energy X ‐ray absorptiometry ( DXA ) and magnetic resonance imaging ( MRI ) were used to determine body composition and the trunk depot. The depots measured were total fat mass ( FM ), total fat‐free mass ( FFM ) and trunk FM and FFM using DXA and MRI in 14 infants. Results None of the regression lines between DXA and MRI significantly deviate from the line of identity for any of the depots studied. However, B land– A ltman analyses revealed bias for trunk FM and trunk FFM . Conclusion Our data showed DXA to be accurate (regression not significantly deviating from the line of identity), with high agreement (indicated by high R 2 ) and without bias (non‐significant B land– A ltman) when estimating total FM and FFM . This could not be said for trunk estimates.