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Precision of Four Acoustic Bone Measurement DevicesThough many studies have quantified the precision of various acoustic bone measurement devices, it is difficult to directly compare the results among the studies, because they used disparate subject pools, did not specify the estimation methodology, or did not use consistent definitions for various precision characteristics. In this study, we used a repeated measures design protocol to directly determine the precision characteristics of four acoustic bone measurement devices: the Mechanical Response Tissue Analyzer (MRTA), the UBA-575+, the SoundScan 2000 (S2000), and the Sahara Ultrasound Bone Analyzer. Ten men and ten women were scanned on all four devices by two different operators at five discrete time points: Week 1, Week 2, Week 3, Month 3 and Month 6. The percent coefficient of variation (%CV) and standardized coefficient of variation were computed for the following precision characteristics: interoperator effect, operator-subject interaction, short-term error variance, and long-term drift. The MRTA had high interoperator errors for its ulnar and tibial stiffness measures and a large long-term drift in its tibial stiffness measurement. The UBA-575+ exhibited large short-term error variances and long-term drift for all three of its measurements. The S2000's tibial speed of sound measurement showed a high short-term error variance and a significant operator-subject interaction but very good values (less than 1%) for the other precision characteristics. The Sahara seemed to have the best overall performance, but was hampered by a large %CV for short-term error variance in its broadband ultrasound attenuation measure.
Document ID
20000105010
Acquisition Source
Johnson Space Center
Document Type
Preprint (Draft being sent to journal)
Authors
Miller, Christopher
(Wyle Labs., Inc. Houston, TX United States)
Rianon, Nahid
(Baylor Coll. of Medicine Houston, TX United States)
Feiveson, Alan
(NASA Johnson Space Center Houston, TX United States)
Shackelford, Linda
(NASA Johnson Space Center Houston, TX United States)
LeBlanc, Adrian
(Baylor Coll. of Medicine Houston, TX United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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