Determination of acoustic velocity in bone

G - Physics – 01 – H

Patent

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G01H 5/00 (2006.01) A61B 8/08 (2006.01)

Patent

CA 2322628

A method of determining an acoustic velocity in a segment of a bone covered with a layer of soft tissue having an outer surface, comprising: determining a first travel time of a first ultrasonic wave along a first path from said outer surface back to said outer surface which path includes at least a first part of said bone segment; determining a second travel time of a second ultrasonic wave along a second path from said outer surface back to said outer surface which path includes at least a second part of said bone segment; determining a third travel time of a third ultrasonic wave along a third path from said outer surface back to said outer surface which path includes at least a third part of said bone segment; and deriving said acoustic velocity in said segment of bone from said three determined travel times.

L'invention concerne un procédé permettant de déterminer la vitesse d'ondes acoustiques dans un segment d'os, recouvert d'une couche de tissu mou présentant une surface externe. Ce procédé consiste à déterminer un premier temps de parcours d'une première onde ultrasonore, le long d'un premier passage du verso de la surface externe vers la surface externe, le chemin comprenant au moins une première partie de segment d'os; à déterminer un second temps de parcours d'une seconde onde ultrasonore, le long d'un second passage du verso de la surface externe vers la surface externe, le chemin comprenant au moins une seconde partie de segment d'os; à déterminer un troisième temps de parcours d'une troisième onde ultrasonore, le long d'un troisième chemin du verso de la surface externe vers la surface externe, le chemin comprenant au moins une troisième partie de segment d'os; et à dériver la vitesse d'une onde acoustique dans le segment d'os à partir des trois temps de parcours déterminés.

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