Factors influencing the speed of sound through the proximal phalanges.

Details

Serval ID
serval:BIB_14437BB184CC
Type
Article: article from journal or magazin.
Collection
Publications
Title
Factors influencing the speed of sound through the proximal phalanges.
Journal
Journal of Clinical Densitometry
Author(s)
Njeh C.F., Richards A., Boivin C.M., Hans D., Fuerst T., Genant H.V.
ISSN
1094-6950
Publication state
Published
Issued date
1999
Peer-reviewed
Oui
Volume
2
Number
3
Pages
241-249
Language
english
Notes
Publication types: Journal Article
Abstract
The amplitude-dependent speed of sound (AD-SOS) in the proximal phalanges is reported to be sensitive to osteoporotic changes. We investigated the influence of bone thickness and cortical thickness on AD-SOS. Phantoms made of Perspex were designed to simulate different bone width (11-16 mm) and cortical thickness (3-7.5 mm). The phantoms were designed with two opposing flat and cylindrical surfaces. The effect of cortical thickness was examined by drilling holes (simulating the medullary canal) of different diameters (1-7 mm) in the middle of the Perspex cylinders. The effect of sample thickness was investigated on solid Perspex phantoms of varied lengths. The standardized precision errors of AD-SOS measurement in vivo and in vitro on volunteers and phantoms were 2.8 and 0.9%, respectively. AD-SOS was influenced by the bone width, cortical thickness, and location along the phalanx. A decrease in either cortical width or cortical thickness resulted in a decrease in AD-SOS. The effect is dependent on whether the contact surface is curved or flat. It is possible that a curved surface has a focusing effect on the wave through the porous core, whereas for a flat surface, the path of the waves might not pass through the center. When cortical thickness and bone width were expressed as a ratio, there was a linear relationship between this ratio and AD-SOS through the phantoms. AD-SOS was independent of thickness for samples greater than 11 mm.
Keywords
Adult, Bone and Bones, Female, Fingers, Humans, Male, Osteoporosis, Phantoms, Imaging, Ultrasonics
Pubmed
Web of science
Create date
02/03/2009 12:33
Last modification date
20/08/2019 12:42
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