Source:http://linkedlifedata.com/resource/pubmed/id/10548820
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
3
|
| pubmed:dateCreated |
1999-11-24
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| pubmed:abstractText |
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.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:citationSubset |
IM
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| pubmed:status |
MEDLINE
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| pubmed:issn |
1094-6950
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:volume |
2
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
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| pubmed:pagination |
241-9
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| pubmed:dateRevised |
2004-11-17
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| pubmed:meshHeading |
pubmed-meshheading:10548820-Adult,
pubmed-meshheading:10548820-Bone and Bones,
pubmed-meshheading:10548820-Female,
pubmed-meshheading:10548820-Fingers,
pubmed-meshheading:10548820-Humans,
pubmed-meshheading:10548820-Male,
pubmed-meshheading:10548820-Osteoporosis,
pubmed-meshheading:10548820-Phantoms, Imaging,
pubmed-meshheading:10548820-Ultrasonics
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| pubmed:year |
1999
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| pubmed:articleTitle |
Factors influencing the speed of sound through the proximal phalanges.
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| pubmed:affiliation |
Osteoporosis and Arthritis Research Group, UCSF, San Francisco, CA 94117-1349, USA. Christopher.njeh@oarg.ucsf.edu
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| pubmed:publicationType |
Journal Article
|