期刊
JOURNAL OF CLINICAL DENSITOMETRY
卷 7, 期 4, 页码 413-418出版社
ELSEVIER SCIENCE INC
DOI: 10.1385/JCD:7:4:413
关键词
dual-energy X-ray absorptiometry; bone mineral density; precision, phantom; human
As part of a multicenter study. we examined the intersite reproducibility of bone mineral content (BMC) and areal density (BMD) among three fan-beam dual-energy X-ray absorptiometry (DXA) instruments from one manufacturer. all using the same software version. Spine, femur, and body-composition phantoms were each scanned nine times at each center. Over a 3-wk period, the same 10 adults were scanned once at each of the three centers. For the spine and femur phantoms, the precision errors were 0.3-0.7%. For the body-composition phantom. the precision errors were 0.8-2.8%. The intersite coefficients of variation for the human measurements varied from 1.1 to 6.8%. depending on the bone site. We conclude that even when using the same fan-beam DXA model and software. an intersite cross-comparison using only phantoms may be inadequate. Comparisons based solely on the use of a spine phantom are insufficient to ensure compatibility of human bone mineral data at other bone sites or for the whole body.
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