Mazess R B, Barden H S
Lunar Corporation, 726 Heartland Trail, Madison, Wisconsin 53717, USA.
Calcif Tissue Int. 2000 Oct;67(4):291-6. doi: 10.1007/s002230001147.
We compared the bone and body composition results in vivo on two bone densitometers using fan-beam geometry (EXPERT and PRODIGY) with those using pencil-beam geometry (DPX). Measurements were made on large groups of adults ranging in weight from about 50 to 120 kg. Both spine and femur neck BMD on the fan-beam densitometers averaged within 1% of the pencil-beam results, and there was no magnitude dependence of the results by Bland-Altman analysis. Total body BMC and BMD on the PRODIGY and DPX were congruent, but on the EXPERT, BMC was about 2% lower and BMD 2% higher than corresponding values on the DPX. Soft-tissue composition was closely congruent for the PRODIGY and DPX; the comparable EXPERT-DPX differences showed greater scatter but no significant magnitude dependence. The smaller fan-angle of the PRODIGY (4 degrees ) probably contributed to its better congruence to pencil-beam results compared with the EXPERT (12 degrees ).
我们比较了使用扇形束几何结构（EXPERT和PRODIGY）的两台骨密度仪与使用笔形束几何结构（DPX）的骨密度仪在体内的骨和身体成分测量结果。对体重约50至120千克的大量成年人群进行了测量。扇形束骨密度仪上的脊柱和股骨颈骨密度平均比笔形束测量结果低1%以内，通过Bland-Altman分析，结果不存在大小依赖性。PRODIGY和DPX上的全身骨矿含量（BMC）和骨密度（BMD）是一致的，但在EXPERT上，BMC比DPX上的相应值低约2%，BMD高2%。PRODIGY和DPX的软组织成分非常一致；EXPERT与DPX的可比差异显示出更大的离散度，但不存在显著的大小依赖性。PRODIGY较小的扇形角（4度）可能使其与笔形束结果的一致性优于EXPERT（12度）。
