Factors influencing the speed of sound through the proximal phalanges.
Détails
ID Serval
serval:BIB_14437BB184CC
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Factors influencing the speed of sound through the proximal phalanges.
Périodique
Journal of Clinical Densitometry
ISSN
1094-6950
Statut éditorial
Publié
Date de publication
1999
Peer-reviewed
Oui
Volume
2
Numéro
3
Pages
241-249
Langue
anglais
Notes
Publication types: Journal Article
Résumé
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.
Mots-clé
Adult, Bone and Bones, Female, Fingers, Humans, Male, Osteoporosis, Phantoms, Imaging, Ultrasonics
Pubmed
Web of science
Création de la notice
02/03/2009 13:33
Dernière modification de la notice
20/08/2019 13:42