Evaluation of Differences Between Fan-Beam and Pencil-Beam Densitometers |
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Authors: | R B Mazess H S Barden |
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Institution: | (1) Lunar Corporation, 726 Heartland Trail, Madison, Wisconsin 53717, USA, US |
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Abstract: | 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°)
probably contributed to its better congruence to pencil-beam results compared with the EXPERT (12°).
Received: 23 February 2000 / Accepted: 14 April 2000 / Online publication: 27 July 2000 |
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Keywords: | : Densitometry — X-ray — Bones — Osteoporosis — Body composition |
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