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IEAP - Institute of Experimental and Applied Physics CTU - Czech Technical University in Prague
CTU - Czech Technical University in Prague
Publication  > 'Displacement tracking in single human trabecula with metal-plated micro-spheres using X-ray radiography imaging'
Displacement tracking in single human trabecula with metal-plated micro-spheres using X-ray radiography imaging

Author

Year
2013

Scientific journal
Journal of Instrumentation 8 C02041

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Abstract
This study presents an improved radiographic method for strain measurement in very small samples of a single trabeculae. X-ray micro-radiography was used to track the deformation behaviour of individual trabecula during mechanical loading. As the X-ray micro-radiography images of a single trabecula show no significant features applicable for digital image correlation (DIC) a random pattern of markers was created on the surfaces of the samples to improve the accuracy of tracking. Metal plated borosilicate glassmicro-spheres (mean diameter 10um) were used as the markers for trabecular displacement tracking. Two different X-ray imaging setups were used for this purpose. The specimens of isolated trabeculae were loaded by amicro-mechanical testing device developed with respect to radiographical observation. This compact device enables a high precision three-point bending measurement. The specimen was continuously irradiated during the loading procedure by amicro-focus X-ray source. The radiographs were acquired by a single-photon counting silicon pixel detector and s flat panel sensor with CsI flipped scintillator plate. Circular Hough transform was used to locate positions of the spherical markers in the sequence of acquired radiographs and to calculate the strain in the loaded sample. The gold-coated micro-spheres provide clearly visible features in the sequence of radiographs after beam hardening correction, which in conjunction with pattern recognition algorithm enables to substantially improve the accuracy of strain measurements.
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Cite article as:
O. Jiroušek, D. Kytýř, T. Doktor, F. Krejčí, "Displacement tracking in single human trabecula with metal-plated micro-spheres using X-ray radiography imaging", Journal of Instrumentation 8 C02041 (2013)

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