Influence of Bone Quality on Precision of Calcaneal Ultrasonometry |
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Authors: | L Rosenthall |
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Institution: | (1) Department of Nuclear Medicine, The Montreal General Hospital, McGill University, 1650 Cedar Avenue, Montreal, Canada H3G 1A4, CA |
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Abstract: | This study was designed to determine the changes in precision of the ultrasound parameters speed of sound (SOS), broadband
ultrasound attenuation (BUA), and stiffness index (SI) as a function of bone quality. The instrument used in this investigation
was the LUNAR Achilles. Of the 608 female patients who had paired measurements with repositioning, 200 had t scores ≥−1 and 408 had t scores ≤−2.5, thus rendering a normal and a grossly abnormal group for comparison of precision results. It was found that
the median precision error (CV%) for BUA was 1.99% for normal bone and 1.44% for abnormal bone (P= 0.02). No significant difference was obtained between median precision errors in normal and abnormal bone for the parameters
SOS and SI, which were 0.23% and 0.19%, and 2.15% and 2.02%, respectively. In the interquartile range, the mean precision
errors for SOS and BUA were significantly different in normal and abnormal bone: SOS was 0.25% and 0.21%, respectively, and
BUA was 2.31% and 1.85%, respectively. No significant change was registered for SI. Precision error appears to decrease slightly
at lower values for calcaneal variables.
Received: 21 August 1996 / Accepted: 5 March 1997 |
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Keywords: | : Ultrasound — Calcaneus — Precision — Bone quality — Densitometry — Repositioning |
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