DocumentCode :
2762991
Title :
Methods for reproducible in vivo apparent velocity in cancellous bone
Author :
Brandenburger, G. ; Avioli, L. ; Chestnut, C. ; Heaney, R. ; McDougall, S. ; Olson, Chris ; Recker, R. ; Turner, C.
Author_Institution :
Osteo-Technol. Inc., Framingham, MA, USA
fYear :
1990
fDate :
4-7 Dec 1990
Firstpage :
1359
Abstract :
The apparent velocity of ultrasound (AVU) yields clinically useful information about bone fragility. AVU is measured at the patella using a small, hand-held probe consisting of a pair of identical, wideband transducers affixed to a digital caliper capable of measuring the width of the bone. The apparent velocity of ultrasound transmission is determined by dividing the measured bone width by the time of flight of the transmitted ultrasound signal. The resulting measurement variability is 2%. An approach for further reducing variability using the arrival time derived from the first zero crossing (ZC), instead of the leading edge, is described. This produces a significant reduction in the variability caused by noise, dispersion of the leading edge, and multipath propagation. Results from a 2-year clinical study of 273 women show a reduction of variability from 41 M/s to 31 M/s. Theory, methods, and clinical results are presented
Keywords :
bioacoustics; biomedical ultrasonics; bone; ultrasonic transducers; ultrasonic transmission; 2 y; bone fragility; bone width; cancellous bone; clinical results; digital caliper; in vivo apparent velocity; multipath propagation; patella; ultrasound transmission; wideband transducers; Bones; In vivo; Noise reduction; Probes; Time measurement; Ultrasonic imaging; Ultrasonic transducers; Ultrasonic variables measurement; Velocity measurement; Wideband;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
Type :
conf
DOI :
10.1109/ULTSYM.1990.171587
Filename :
171587
Link To Document :
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