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Med Eng Phys. 1998 Nov;20(8):594-601.

Laser speckle photography to measure surface displacements on cortical bone--verification of an automated analysis system.

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IRC in Biomedical Materials, Queen Mary and Westfield College, University of London, UK.


A non-contact strain measurement method that could be used in a physiological environment was adapted to determine accurately the mechanical properties of bone. The technique of laser speckle photography was applied to record in-plane surface displacements. An automated image analysis system, based on a Fast Fourier Transform algorithm, was developed for data acquisition and its accuracy and precision verified. It was established that the technique could be used at magnifications of up to 60x , providing an ultimate resolution of approximately 1 microm. Displacement measurements on cortical bone submerged in water were demonstrated, which is of great value in determining the true physiological properties of bone.

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