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Comparisons between Hologic QDR 1000W, QDR 4500A, and Lunar Expert Dual‐Energy X‐ray Absorptiometry Scanners Used for Measuring Total Body Bone and Soft Tissue
Author(s) -
TOTHILL P.,
HANNAN W. J.
Publication year - 2000
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2000.tb06422.x
Subject(s) - dual energy x ray absorptiometry , nuclear medicine , bone mineral , bone mineral content , magnification , bone density , soft tissue , densitometer , imaging phantom , medicine , physics , osteoporosis , surgery , optics
A bstract : Measurements of total‐body bone and soft tissue were compared between two fan‐beam dual‐energy X‐ray absorptiometry (DXA) scanners, a Hologic QDR 4500A, a Lunar Expert, and a pencil‐beam Hologic QDR 1000W. Phantom studies showed that mass measurements were not compromised by magnification effects, but that the height of a bone within the body affected the measured bone mineral content (BMC) and, to a lesser extent, the bone mineral density (BMD). There were differences in calibration for fat proportion between the three instruments. Comparisons on volunteers demonstrated very high correlations of bone and soft tissue measurements, but regression coefficients differed from unity, and intercepts were significant. With all three scanners, wrapping lard around the limbs of a volunteer, to simulate weight change, changed the apparent BMC and BMD.