Temperature dependency of Quantitative ultrasound

Quantitative ultrasound (QUS) parameters are temperature dependent. We examined the effect of temperature on QUS using Lunar Achilles+ and Hologic Sahara units. In vivo studies were performed in a cadaveric foot and in 5 volunteers. QUS scans were performed in the cadaveric foot, using both machines...

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Bibliographic Details
Published in:Osteoporosis international 2000-05, Vol.11 (4), p.316-320
Main Authors: POCOCK, N. A, BABICHEV, A, CULTON, N, GRANEY, K, ROONEY, J, BELL, D, CHU, J
Format: Article
Language:English
Subjects:
Biological and medical sciences
Body Temperature
Foot Bones - diagnostic imaging
Fractures
Humans
Investigative techniques, diagnostic techniques (general aspects)
Joints
Laboratories
Medical research
Medical sciences
Nuclear medicine
Osteoporosis
Reference Values
Temperature
Ultrasonic imaging
Ultrasonic investigative techniques
Ultrasonics
Ultrasonography
Water temperature
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Summary:Quantitative ultrasound (QUS) parameters are temperature dependent. We examined the effect of temperature on QUS using Lunar Achilles+ and Hologic Sahara units. In vivo studies were performed in a cadaveric foot and in 5 volunteers. QUS scans were performed in the cadaveric foot, using both machines, at temperatures ranging from 15 to 40 degrees C. To assess the effect of change in water bath temperature in the Achilles+, independently of foot temperature, 5 volunteers were studied at water temperatures ranging from 10 to 42 degrees C. In the cadaveric foot there were strong negative correlations between temperature and speed of sound (SOS) but a moderately positive correlation between temperature and broadband ultrasound attenuation (BUA). Stiffness and the Quantitative Ultrasound Index (QUI) in the cadaveric foot showed strong negative correlations with temperature, reflecting their high dependence on SOS. In the 5 volunteers, in whom foot temperature was assumed to be constant, there was a small change in Stiffness in the Achilles+, with variation in water temperature. In conclusion, while there are opposite effects of temperature on SOS and BUA in vivo, there is still a significant effect of temperature variation on Stiffness and the QUI. This may have clinical significance in particular subjects. The precision of QUS may be affected by temperature variation of the environment or of the patient's limb. Instruments utilizing a water bath may be able partly to compensate for changes in environmental temperature, but standardization of water bath temperature is crucial to maximize precision.
ISSN:0937-941X
1433-2965
DOI:10.1007/s001980070120