21 October 2016 Real-time three-dimensional digital image correlation for biomedical applications
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Abstract
Digital image correlation (DIC) has been successfully applied for evaluating the mechanical behavior of biological tissues. A three-dimensional (3-D) DIC system has been developed and applied to examining the motion of bones in the human foot. To achieve accurate, real-time displacement measurements, an algorithm including matching between sequential images and image pairs has been developed. The system was used to monitor the movement of markers which were attached to a precisely motorized stage. The accuracy of the proposed technique for in-plane and out-of-plane measurements was found to be −0.25% and 1.17%, respectively. Two biomedical applications were presented. In the experiment involving the foot arch, a human cadaver lower leg and foot specimen were subjected to vertical compressive loads up to 700 N at a rate of 10  N/s and the 3-D motions of bones in the foot were monitored in real time. In the experiment involving distal tibio fibular syndesmosis, a human cadaver lower leg and foot specimen were subjected to a monotonic rotational torque up to 5 Nm at a speed of 5 deg per min and the relative displacements of the tibia and fibula were monitored in real time. Results showed that the system could reach a frequency of up to 16 Hz with 6 points measured simultaneously. This technique sheds new lights on measuring 3-D motion of bones in biomechanical studies.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Rong Wu, Hua Wu, Dwayne Arola, Dongsheng Zhang, "Real-time three-dimensional digital image correlation for biomedical applications," Journal of Biomedical Optics 21(10), 107003 (21 October 2016). https://doi.org/10.1117/1.JBO.21.10.107003 . Submission:
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