Full-field measurements of large compressive deformations in human trabecular bone using digital volume correlation

0360884 - ÚTAM 2012 RIV BE eng C - Conference Paper (international conference)
Jiroušek, Ondřej - Jandejsek, Ivan
Full-field measurements of large compressive deformations in human trabecular bone using digital volume correlation.
ISB 2011. Brussels: International Society of Biomechanics, 2011 - (Feipel, V.), s. 69-70. ISBN 9789090260198.
[ISB 2011. Brusel (BE), 03.07.2011-07.07.2011]
R&D Projects: GA ČR(CZ) GAP105/10/2305
Institutional research plan: CEZ:AV0Z20710524
Keywords : digital volume correlation * trabecular bone * large deformations
Subject RIV: FI - Traumatology, Orthopedics

Cylindrical sample of human trabecular bone has been incrementally compressed and its deformed microstructure captured using time-lapse microtomography. From the captured projections the deformed microstructure has been reconstructed and the displacement and deformation fields computed using a digital volume correlation (DVC) method. The approach is based on a modified Lucas-Kanade algorithm and optimized for accuracy. Displacement and strain fields are then compared to a FE model of the sample subjected to the same boundary conditions and loaded similarly with the experiment. Precision of the method is assessed using artificially deformed micro-CT images as well as data from the compression test. Results show possibility of used DVC algorithm to capture the displacements and strains in trabecular bone microstructure with high accuracy when a high-resolution X-ray detector is used.
Permanent Link: http://hdl.handle.net/11104/0198333